CN102373320A - Technology for manufacturing micro/nano-block by stirring, fractionating, welding and performing combined extrusion - Google Patents
Technology for manufacturing micro/nano-block by stirring, fractionating, welding and performing combined extrusion Download PDFInfo
- Publication number
- CN102373320A CN102373320A CN2011101482192A CN201110148219A CN102373320A CN 102373320 A CN102373320 A CN 102373320A CN 2011101482192 A CN2011101482192 A CN 2011101482192A CN 201110148219 A CN201110148219 A CN 201110148219A CN 102373320 A CN102373320 A CN 102373320A
- Authority
- CN
- China
- Prior art keywords
- extrusion
- friction stir
- stir welding
- deformation
- welding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001125 extrusion Methods 0.000 title claims abstract description 38
- 238000003466 welding Methods 0.000 title claims abstract description 34
- 238000003756 stirring Methods 0.000 title claims abstract description 30
- 238000005516 engineering process Methods 0.000 title claims description 8
- 238000004519 manufacturing process Methods 0.000 title description 6
- 239000000463 material Substances 0.000 claims abstract description 38
- 229910052751 metal Inorganic materials 0.000 claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims description 14
- 239000000956 alloy Substances 0.000 claims description 11
- 229910045601 alloy Inorganic materials 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 10
- 238000013461 design Methods 0.000 claims description 8
- 238000004458 analytical method Methods 0.000 claims description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 239000010936 titanium Substances 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 2
- 229910001092 metal group alloy Inorganic materials 0.000 claims description 2
- 238000011056 performance test Methods 0.000 claims description 2
- 238000005070 sampling Methods 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims 1
- 239000013078 crystal Substances 0.000 abstract description 9
- 238000002360 preparation method Methods 0.000 description 12
- 229910001069 Ti alloy Inorganic materials 0.000 description 9
- 238000012545 processing Methods 0.000 description 8
- 238000004381 surface treatment Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 229910000737 Duralumin Inorganic materials 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000007431 microscopic evaluation Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002159 nanocrystal Substances 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000008698 shear stress Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Landscapes
- Pressure Welding/Diffusion-Bonding (AREA)
- Forging (AREA)
Abstract
在摩擦搅拌焊接中，由于搅拌头在旋转的同时对变形材料施加了较大的正压力，类似于是高压扭转变形，因此通过搅拌摩擦焊的焊接，焊缝处材料已经经历了一次剧烈变形，晶粒得到初步细化，尤其焊缝下部是细小的等轴晶粒。在此基础上，考虑导搅拌摩擦焊金属以垂直板材方向为轴的轴对称金属流动特征，取焊缝附近材料为挤压变形坯料，以焊接方向为挤压方向进行扭转挤压剧烈塑性成形，由于挤压变形方向与摩擦焊的挤压方向互相垂直，利用两种变形金属流动的互补性细化晶粒，改善组织，制备高质量微纳米多晶体块体。In friction stir welding, since the stirring head exerts a large positive pressure on the deformed material while rotating, which is similar to high-pressure torsional deformation, the material at the weld has undergone a severe deformation through friction stir welding, and the crystal The grains are initially refined, especially the lower part of the weld is fine equiaxed grains. On this basis, considering the axisymmetric metal flow characteristics of the guided friction stir welding metal with the vertical plate direction as the axis, the material near the weld is taken as the extrusion deformed blank, and the torsional extrusion is performed with the welding direction as the extrusion direction. Since the extrusion deformation direction and the friction welding extrusion direction are perpendicular to each other, the complementarity of the two deformed metal flows is used to refine the crystal grains, improve the structure, and prepare high-quality micro-nano polycrystalline blocks.
Description
Technical field
The invention belongs to through mechanical workout and prepare the high-performance metal materials technical field; Be a kind of on the basis of friction stir welding, the cooperation to reverse extruding (the extrusion axis direction is a welding direction); Material is carried out violent plastic making, and preparation does not have the micro-nano block materials of standard in cavity and slit.
Background technology
Nanotechnology is the emerging technology that begins to develop the beginning of the nineties in last century, mainly is to explore between grand microcosmic but more approach the characteristics of motion and the interaction relationship thereof of the nanoscale substance system of microcosmic.Owing to its huge pushing effect to science and technology such as information science, life science and Materials science receives the great attention of countries in the world and is able to fast development, all be used widely in fields such as material, information, the energy, environment, life and military affairs at present.
The metal nano polycrystal is the crossing research field of nanomaterial science and nanomechanics, mainly studies various organization mechanics performances, characteristic and the rule of the metal polycrystal between grain-size 1～100nm, is the important component part of modern nanotechnology.Because the atomicity that the nano-multicrystal body comprises is between 10
2～10
7Between; Various microcosmic thermokinetics statistical shortcomings such as room, gap substitutional atom, dislocation fault no longer have the macroscopic statistics rule; The material microdefect of crystals significantly reduces; Part crystal even approach perfect crystal shows high strength of materials characteristic, and wherein the increase rate of elastic stiffness and plastic strength can reach 1000%.Obviously, if can prepare the Ti alloy with high performance block materials through the method for nanometer then for promoting titanium alloy as structural timber, especially the application of advanced configuration such as Aeronautics and Astronautics, plate armour material is with significant.
But the preparation method of metal current nano-multicrystal body still is in the exploratory stage, and commonly used have methods such as original position generation, powder metallurgy, amorphous crystallization, galvanic deposit, solidification Control and violent plastic making.Compare with preparation method based on physical and chemical process; (Severe Plastic Deformation, SPD) the nano-multicrystal body of preparation has that dense structure, pore-free crack and interface are weak to connect, be difficult for introducing impurity, Interface Microstructure cleaning and do not have advantage such as particle agglomeration in violent plastic making.But compare with the bulk nanometer of nano particle cured and prepared; There is nanocrystalline size in the bulk nanometer of at present violent plastic making preparation, and bigger than normal (problems such as (the macro-mechanical property increase rate are merely 100%～120%) that there is saturation value in nanocrystalline diameter in 200nm～300nm), the repeated deformation process, the reinforcement amplitude is on the low side can't be given full play to nanocrystalline height and strengthen characteristic.
The major cause that causes these phenomenons is that shear-stress violent in the deformation process is when causing that crystal grain along shear direction violent relatively sliding takes place; The intracrystalline microplasticity behavior of shear surface two layers of material can't be coordinated interatomic bond and close rebuilding of relation; Grain refining shows as cuts off the type refinement, and forming a large amount of is the microdefect of representative with tiny crack micropore hole.Especially for strengthening phase disperse distribution and strengthening element atomic radius and the bigger solid solution strengthened alloy of matrix atomic radius difference, growth of the forming core of its microdefect and distribution show more extensively and rapid.Be main owing to violent plastic making prepares nanocrystal with shearing strain in addition; Distorted area material hydrostaticpressure is almost nil; The caused microdefect of violent shearing can't obtain closed timely and repair; Causing through squeezing with isometrical angle is that the macro-mechanical property of micro-nano polycrystalline material of violent viscous deformation preparation of representative does not only significantly improve sometimes, even also can be lower than coarse-grain, has had a strong impact on its application as structured material.
Summary of the invention
The present invention is directed at present violent plastic making prepares micro-nano polycrystal and exists nanocrystalline diameter saturated and the reinforcement amplitude is on the low side; Can't give full play to the nanocrystalline high problem of strengthening characteristic, with the titanium of the extensive aerospace field of quilt, aluminum is main object; Provided a kind of novel method of welding extruding compound preparation engineering structure with the micro-nano titanium alloy block materials of high quality; It is simple to have technology, is convenient to realize, is fit to the micro-nano multicrystal characteristics of the multiple metallic substance of preparation.
The present invention includes friction stir welding and violent plastic making extruding twice basic working procedure, all can on traditional welding and extrusion equipment, accomplish, need not the extras investment, be fit to very much the technology upgrading and the transformation of medium-sized and small enterprises.
The present invention mainly comprises following content:
The first step: friction Stir and blanking.Can carry out friction stir welding through the agitating friction soldering equipment, or directly buy with friction stir welding welding metal alloy (titanium, aluminium etc.) later and cut, keep weld seam as reversing the violent plastic making of extruding blank section bar to be extruded.
Second step: reverse extruding violent plastic making (like Fig. 1).Alloy billet that will blanking obtains after friction Stir places and reverses the extruding container, cooperates through corresponding extrusion equipment and reverses extrusion mould and reverse the violent viscous deformation of extruding.Rely in the extrusion process with the extrusion axis is that the vertical deformation of violent rotational symmetry shearing strain and friction stir welding metal flow direction at center concerns; Under the condition that does not change the blank cross-sectional geometry, become to making alloy grain that violent intersection torsional deformation takes place, form refinement alloy grain.
The 3rd step: sampling analysis, Mechanics Performance Testing and microstructure observation.Carry out microscopic analysis for reversing the material that obtains after the crimp, confirm the variation of grain-size and macroscopical mechanical property, determine whether to satisfy that design will be gone or needs further do not reverse crimp.
Principle of work of the present invention: in friction stir weld; Because stirring-head has applied bigger positive pressure to deformable material in rotation; Being similar to is high pressure torsion distortion (see figure 2), and therefore through the welding of friction stir welding, the commissure material has experienced drastic deformation one time; Crystal grain obtains preliminary refinement, and especially the weld seam bottom is tiny equi-axed crystal.On this basis; Consider to lead the friction stir welding metal with the rotational symmetry metal flow characteristic that vertical sheet material direction is an axle, getting near the material of weld seam is the crimp blank, is that the direction of extrusion is reversed the violent plastic making of extruding with the welding direction; Because the direction of extrusion of crimp direction and FW is orthogonal; Utilize the complementary crystal grain thinning of two kinds of deformable metal mobile, improve tissue, the micro-nano polycrystal block of preparation high quality.
Embodiment
Relate to the selection of preparation, the extrusion equipment of blank in this patent practical implementation process, acutely reverse the manufacturing of extrusion mould, violent plastic making crimp and the materials microstructure after violent plastic making and the test analysis of performance, mainly comprise:
One: the manufacturing of the preparation of alloy billet, lectotype selection and mould.Geometrical dimension according to final shaping alloy components combines the corresponding blank of friction stir welding Design and Machining.The material that can purchase the welding of friction stir welding one obtains the blank of position while welding meeting geometric dimensional requirement through mechanical workout (milling) or electromachining (line cutting), also can carry out friction stir welding voluntarily according to the geometrical dimension of member and also cut and obtain the position while welding material.Accomplish the type selecting of calculating extrusion pressure and extrusion equipment simultaneously according to the structure of final shaping alloy components, and extrusion mould is reversed in processing and manufacturing accordingly.
Two: reverse the violent plastic forming process design construction of extruding.According to the grand microtexture and the tissue characteristic of material, design construction reverses the violent plastic forming process of extruding, mainly refers to passes.Because it is saturated that the grain refining of single violent plastic making exists, so the passage extruding is no more than 4 times as far as possible.
Three: the material structure performance test analysis.To carry out the test of macroscopic material performance and microtexture through the material that reverses extruding, analyze final material property and tissue characteristic.Because stir friction welding seam position discontinuity of material, further reverse the violent plastic making processing of extruding for the material of unmet design requirements.
Four: the surface treatment of final drip molding, block and follow-up processing.Carry out surface treatment for the material that meets the demands through test analysis, and block and preservation and follow-up processing according to accessory size.
The micro-nano polycrystalline section bar of the positive square section of embodiment 1 5X5mm titanium alloy
Directly buy the titanium alloy material through friction Stir from factory, because mold cavity is of a size of 5X5mm, greater than 5mm, width is greater than 5mm along thickness for the material weld seam of purchase, and length is greater than 30mm.。
At first preparing the cross section is foursquare titanium alloy section bar.Consider the requirement of surface quality and follow-up surface treatment working accuracy, can be processed into the square sectional titanium alloy weld seam section bar of 6X6mm earlier, lead fillet, length can be confirmed according to the actual requirements.
Next calculates squeeze, selects extrusion equipment and processing and manufacturing to reverse extrusion mould accordingly according to squeeze and working condition, and under the requirement of satisfying the extruding tonnage, extrusion equipment both can have been selected for use and vertically also can select horizontal extruder for use.After the extruding passage can select the 3-4 passage to reverse extruding, for guaranteeing can be with blank Rotate 180 degree in the metal mobile homogeneity deformation process.
When pushing violent plastic making on this basis, lubricatedly can select molybdenumdisulphide or high-performance nano lubricant for use.After finally confirming that through the structure property test microtexture meets design requirement; Such as surface quality is had requirement then can through the mechanical workout mode to the processing bar carry out surface treatment, otherwise the micro-nano polycrystalline bulk of square sectional titanium alloy section bar material can directly be delivered goods.
Embodiment 2
The micro-nano polycrystal of preparation 6mm*8mm square-section aluminium alloy extrusions.
Directly buy the aluminum alloy series material through friction Stir from factory, because mold cavity is of a size of 6X8mm, greater than 6mm, width is greater than 8mm along thickness for the material weld seam of purchase, and length is greater than 30mm.
At first preparing the cross section is foursquare aluminium alloy extrusions.Consider the requirement of surface quality and follow-up surface treatment working accuracy, can be processed into the square sectional duraluminum weld seam section bar of 7X9mm earlier, lead fillet, length can be confirmed according to the actual requirements.Next calculates squeeze, selects extrusion equipment and processing and manufacturing to reverse extrusion mould accordingly according to squeeze and working condition, and under the requirement of satisfying the extruding tonnage, extrusion equipment both can have been selected for use and vertically also can select horizontal extruder for use.After the extruding passage can select the 3-4 passage to reverse extruding, for guaranteeing can be with blank Rotate 180 degree in the metal mobile homogeneity deformation process.
When pushing violent plastic making on this basis, lubricatedly can select molybdenumdisulphide or high-performance nano lubricant for use.After finally confirming that through the structure property test microtexture meets design requirement; Such as surface quality is had requirement then can through the mechanical workout mode to the processing bar carry out surface treatment, otherwise the 6X8mm square-section micro-nano polycrystalline bulk of titanium alloy section bar material can directly be delivered goods.
Description of drawings: Fig. 1 reverses the crimp synoptic diagram.
Fig. 2 is the stir friction welding process synoptic diagram.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101482192A CN102373320A (en) | 2011-06-03 | 2011-06-03 | Technology for manufacturing micro/nano-block by stirring, fractionating, welding and performing combined extrusion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101482192A CN102373320A (en) | 2011-06-03 | 2011-06-03 | Technology for manufacturing micro/nano-block by stirring, fractionating, welding and performing combined extrusion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102373320A true CN102373320A (en) | 2012-03-14 |
Family
ID=45792547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101482192A Pending CN102373320A (en) | 2011-06-03 | 2011-06-03 | Technology for manufacturing micro/nano-block by stirring, fractionating, welding and performing combined extrusion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102373320A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103572088A (en) * | 2013-11-27 | 2014-02-12 | 山东建筑大学 | Titanium-based porous sintering composite material with nanocrystal tissues and preparation method thereof |
| CN104862628A (en) * | 2015-05-27 | 2015-08-26 | 西南大学 | Method for increasing copper tensile strength |
| CN115041680A (en) * | 2022-06-16 | 2022-09-13 | 湘潭大学 | Method for integrating preparation and forming of metal-based composite material |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101537529A (en) * | 2009-04-24 | 2009-09-23 | 重庆大学 | Pin tool for friction stir welding and ultrafine grain preparation method thereof |
| CN101544352A (en) * | 2009-04-24 | 2009-09-30 | 重庆大学 | Method and equipment for preparing nano material with large thickness and area through acute plastic deformation |
-
2011
- 2011-06-03 CN CN2011101482192A patent/CN102373320A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101537529A (en) * | 2009-04-24 | 2009-09-23 | 重庆大学 | Pin tool for friction stir welding and ultrafine grain preparation method thereof |
| CN101544352A (en) * | 2009-04-24 | 2009-09-30 | 重庆大学 | Method and equipment for preparing nano material with large thickness and area through acute plastic deformation |
Non-Patent Citations (2)
| Title |
|---|
| 《中国有色金属学报》 20100430 康志新等 "剧塑性变形制备超细晶／纳米晶结构金属材料的研究现状和应用展望" 第588-589页，图3 1 第20卷, 第4期 * |
| 康志新等: ""剧塑性变形制备超细晶／纳米晶结构金属材料的研究现状和应用展望"", 《中国有色金属学报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103572088A (en) * | 2013-11-27 | 2014-02-12 | 山东建筑大学 | Titanium-based porous sintering composite material with nanocrystal tissues and preparation method thereof |
| CN103572088B (en) * | 2013-11-27 | 2015-09-09 | 山东建筑大学 | Titanium-based porous sintered composite material with nanocrystalline structure and preparation method thereof |
| CN104862628A (en) * | 2015-05-27 | 2015-08-26 | 西南大学 | Method for increasing copper tensile strength |
| CN115041680A (en) * | 2022-06-16 | 2022-09-13 | 湘潭大学 | Method for integrating preparation and forming of metal-based composite material |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Li et al. | Reducing arc heat input and obtaining equiaxed grains by hot-wire method during arc additive manufacturing titanium alloy | |
| CN102234752B (en) | Method for preparing titanium alloy micron/nano bulk by twisting-shearing combined extrusion | |
| Ji et al. | Microstructure and mechanical properties of 304L steel fabricated by arc additive manufacturing | |
| EP3181711B1 (en) | Aluminium alloy containing scandium for powder metallurgy technologies | |
| Tahmasbi et al. | Evaluation of microstructure and mechanical properties of aluminum AA7022 produced by friction stir extrusion | |
| Babaei et al. | Tube cyclic expansion-extrusion (TCEE) as a novel severe plastic deformation method for cylindrical tubes | |
| Xu et al. | Microstructural evolution and its effect on mechanical properties of spray deposited 2195 alloy during porthole die extrusion process | |
| Sepahi-Boroujeni et al. | Expansion equal channel angular extrusion, as a novel severe plastic deformation technique | |
| Liang et al. | Micro/nano incremental material removal mechanisms in high-frequency ultrasonic vibration-assisted cutting of 316L stainless steel | |
| Darsell et al. | Shear Assisted Processing and Extrusion (ShAPE™) of AZ91E Flake: A study of tooling features and processing effects | |
| Kumar et al. | Effect of traverse speed on microstructure and mechanical properties of friction-stir-welded third-generation Al–Li alloy | |
| Liu et al. | Interfacial characteristic of multi-pass caliber-rolled Mg/Al compound castings | |
| Wang et al. | Cracking suppression in additive manufacturing of hard-to-weld nickel-based superalloy through layer-wise ultrasonic impact peening | |
| CN102373320A (en) | Technology for manufacturing micro/nano-block by stirring, fractionating, welding and performing combined extrusion | |
| US12186791B2 (en) | Devices and methods for performing shear-assisted extrusion and extrusion processes | |
| EP1568486A1 (en) | Method for manufacturing of workpieces or semifinished products containing titanium aluminide alloys and products made thereby | |
| CN104607523A (en) | Incremental sheet metal stirring composite forming device and method | |
| CN105154800A (en) | Method for preparing titanium alloy nano materials through warm extrusion of herringbone channel mold | |
| US20210379638A1 (en) | Devices and Methods for Performing Shear-Assisted Extrusion and Extrusion Processes | |
| CN111495998B (en) | Metal and metal matrix composite forming device | |
| Hu et al. | Weld appearance, microstructure evolution and microhardness of welded joint in the TC4 additive manufactured component TIG welding | |
| Li et al. | Progress in the preparation, forming and machining of metallic glasses | |
| Milner et al. | Microstructural evolution and its relationship to the mechanical properties of Mg AZ31B friction stir back extruded tubes | |
| Darya et al. | Investigation of the overlapping coefficient impact on the structure and mechanical properties of Al-Mg alloy obtained by wire arc additive manufacturing | |
| Sun et al. | Investigation on friction stir welding of Mg/Al T-joints |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120314 |