CN101575683A - High strength corrosion resistant rare earth cast magnesium alloy and preparation method thereof - Google Patents
High strength corrosion resistant rare earth cast magnesium alloy and preparation method thereof Download PDFInfo
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- CN101575683A CN101575683A CNA200910099330XA CN200910099330A CN101575683A CN 101575683 A CN101575683 A CN 101575683A CN A200910099330X A CNA200910099330X A CN A200910099330XA CN 200910099330 A CN200910099330 A CN 200910099330A CN 101575683 A CN101575683 A CN 101575683A
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Abstract
The invention discloses a high strength corrosion resistant rare earth cast magnesium alloy and a preparation method thereof, which is characterized in that: the magnesium alloy comprises the following components according to the weight percentage: 1.8 to 4.0 percent of Nd, 1.0 to 2.0 percent of Gd, 0.2 to 0.8 percent of Zn, 0.4 to 1.0 percent of Zr, 0.0 to 0.8 of Ca, not more than 0.02 percent of total content of impurity elements of Fe, Cu and Ni, and the balance of Mg complemented to 100 percent; and the preparation method comprises the following steps of: melting pure magnesium, adding Mg-Nd intermediate alloy, Mg-Gd intermediate alloy, Mg-Ca intermediate alloy and commercial pure Zn in sequence, heating up to 760 DEG C to 785 DEG C after the mixture is totally melted, adding Mg-Zr intermediate alloy, stirring fully and evenly after the Mg-Zr intermediate alloy is melted, standing for 10 to 20 minutes, removing dross, and then casting ingots or casting the cast products at the temperature of 720 DEG C to 750 DEG C. The cast magnesium alloy has the advantages of controllable melting process, appropriate cost, excellent mechanical property, corrosivity, good casting process property and the like; and the cast magnesium alloy can be used to manufacture various non-die casting magnesium alloy parts by adopting the processes of sand mold casting, low-pressure casting, counter-pressure casting or squeezing casting, etc.
Description
Technical field
The present invention relates to a kind of cast magnesium alloys and preparation method thereof, especially relate to high strength corrosion resistant rare earth cast magnesium alloy and preparation method thereof, belong to metallic substance or metallurgical technology field.
Background technology
Magnesium alloy is a lightest present structural metallic materials, has high specific tenacity, specific rigidity and good machinability, is with a wide range of applications in automobile, space flight and aviation and military equipment field.Cast magnesium alloys accounts for very big proportion in magnesium alloy is used.But material mechanical performance is on the low side, poor corrosion resistance, has seriously restricted Application of Magnesium, the functional component that requires of particular surroundings especially, primary and secondary load parts.For the high-performance magnesium-alloy parts, extrusion process can not be satisfied the demand, because the casting technique performance of magnesium alloy is generally not as cast aluminium alloy, the ratio of specific heats cast aluminium alloy of cast magnesium alloys is low by about 1/3rd, and thin-wall complicated parts can't adopt the gravity metal mold casting to realize moulding.
Other looks into number of patent application is a kind of magnesium alloy that contains rare earth of Chinese patent of 200610157013.5 and preparation method thereof, adopts extrusion process exactly.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of high strength corrosion resistant rare earth cast magnesium alloy and preparation method thereof at the above-mentioned state of the art, magnesium alloy materials of the present invention has good room-temperature mechanical property and corrosion resistance nature, the casting technique performance is good, can realize the manufacturing of high-quality parts.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of high strength corrosion resistant rare earth cast magnesium alloy is characterized in that: the component of magnesium alloy and weight percent thereof are:
Nd 1.8～4.0(wt)％；
Gd 1.0～2.0(wt)％；
Zn 0.2～0.8(wt)％；
Zr 0.4～1.0(wt)％；
Ca 0.0～0.8(wt)％；
The total content of Fe, Cu and Ni impurity element is not more than 0.02 (wt) %;
Mg is a surplus, complements to 100 (wt) %.
A kind of preparation method of high strength corrosion resistant rare earth cast magnesium alloy is characterized in that steps in sequence is:
(1) with pure magnesium, Mg-Nd master alloy, Mg-Gd master alloy, Mg-Ca master alloy, pure Zn 150～250 ℃ of preheatings;
(2) melt pure Mg: pure magnesium is joined to brush in coating and the crucible through 150～250 ℃ of dry bakings melt, crucible feeds SF
6/ CO
2Mixed gas, SF6 volume content 0.5～2.0Vol%;
(3) add Nd and Gd: add the Mg-Nd master alloy earlier at 680～730 ℃, stir the fusing back, adds the Mg-Gd master alloy afterwards again, and fusing is also stirred melt;
(4) add Ca and Zn: add Mg-Ca master alloy and industrial-purity zinc at 700～730 ℃, melt is stirred in the fusing back;
(5) add Zr: melt temperature is risen to 760～785 ℃, add Mg-Zr master alloy and fusing, stir, left standstill afterwards 10 minutes～20 minutes, drag for removing dross, cast at 720～750 ℃.
Described casting adopts sand mold casting, low-pressure casting, counter-pressure casting and extrusion casting to make ingot casting or all kinds of non-diecast magnesium alloy foundry goods.
Described ingot casting or all kinds of non-diecast magnesium alloy foundry goods adopt following solid solution treatment method and aging treatment method:
(1) solid solution treatment method: 520～540 ℃ of temperature, 6～10 hours time, water or oil quenching;
(2) aging treatment method: 200～220 ℃ of temperature, 8～16 hours time.
Compared with prior art, the invention has the advantages that:
Casting sample is handled through T6, and room temperature tensile strength and unit elongation are not less than respectively that tensile strength and unit elongation are not less than 200MPa and 7% respectively under 240MPa and 5%, the 200 ℃ of temperature.
Magnesium alloy of the present invention carries out the test of casting technique performance to it, and melt is 720～750 ℃ of casting down, and the length of the mobile sample of casting mold room temperature spiral type is not less than 250mm, and relative reduction in area is not more than 1.3%.
After magnesium alloy of the present invention was handled through T6, sample soaked corrosion rate test result average corrosion rate and is no more than 0.22 milligram every square centimeter of every day, i.e. 0.22mg.cm-2d-1 in room temperature 5%NaCl neutral aqueous solution in 72 hours entirely.
The cast magnesium alloys of invention has the controllability of fusion process, cost is suitable, advantage such as mechanical property, corrodibility, casting technique performance are good, cast magnesium alloys of the present invention can adopt technologies such as sand mold casting, low-pressure casting, counter-pressure casting or extrusion casting to make all kinds of non-diecast magnesium alloy parts.
Embodiment
Below in conjunction with embodiment the present invention is described in further detail.
Concrete embodiment 1:
Adopt magnesium alloy materials of the present invention to make foundry goods by sand casting process.
Alloy compositions:
Nd 2.5(wt)％；
Gd 1.2(wt)％；
Zn 0.4(wt)％；
Zr 0.4(wt)％；
Ca 0.8(wt)％；
The total content of Fe, Cu and Ni impurity element is not more than 0.005 (wt) %;
The Mg surplus.
The melting step is:
(1) dispose alloy on request, with pure magnesium, Mg-25wt%Nd master alloy, Mg-25wt%Gd master alloy, Mg-10wt%Ca master alloy, Mg-30wt%Zr master alloy, pure Zn 150～250 ℃ of preheatings;
(2) crucible swabbing, heating, drying adds pure magnesium, heat fused at 200 ℃;
(3) melt temperature adds the Mg-25wt%Nd master alloy earlier at 700 ℃, adds Mg-25wt%Gd master alloy heat fused and stirring after the fusing again;
(4) melt temperature adds Mg-10wt%Ca master alloy and industrial-purity zinc at 720 ℃;
(5) be warming up to 760 ℃, add the Mg-30wt%Zr master alloy, fully stir, be cooled to 720 ℃, left standstill 10 minutes, scum and prepare casting.
Valve cover on the foundry goods vehicle of casting is shaped as the band pentahedron at the end, and maximum physical dimension is high 200mm, long 300mm, wide 150mm, foundry goods average wall thickness are 15mm, and mold material adopts the precoated sand moulding, adopt the bottom surface up, inclination 15 degree, the bottom filling casting, pouring time is no more than 20 seconds.
Foundry goods is handled through solution treatment and artificial aging, parts sampling room temperature tensile strength 245MPa, and elongation 5%, room temperature 5%NaCl soak corrosion rate every square centimeter of 0.21 milligram of (0.21mg.cm every day entirely
-2d
-1).
Concrete embodiment 2:
Adopt the counter-pressure casting moulding of the thin-wall complicated parts of magnesium alloy materials of the present invention.
Alloy compositions:
Nd 2.8(wt)％；
Gd 1.4(wt)％；
Zn 0.6(wt)％；
Zr 0.6(wt)％；
Ca 0.2(wt)％；
The total content of Fe, Cu and Ni impurity element is not more than 0.005 (wt) %;
The Mg surplus.
The melting step is:
(1) dispose alloy on request, with pure magnesium, Mg-25wt%Nd master alloy, Mg-25wt%Gd master alloy, Mg-10wt%Ca master alloy, Mg-30wt%Zr master alloy, pure Zn 150～250 ℃ of preheatings;
(2) crucible swabbing, heating, drying adds pure magnesium, heat fused at 200 ℃;
(3) melt temperature adds the Mg-25wt%Nd master alloy earlier at 700 ℃, adds Mg-25wt%Gd master alloy heat fused and stirring after the fusing again;
(4) melt temperature adds Mg-10wt%Ca master alloy and industrial-purity zinc at 720 ℃;
(5) be warming up to 765 ℃, add the Mg-30wt%Zr master alloy, after fully stirring, be cooled to 720 ℃, left standstill 10 minutes, scum and prepare casting.
The foundry goods of casting is certain load drive disk assembly, is shaped as back taper, upper and lower opening; maximum physical dimension is high 450mm * 450mm * 400mm; the thin-walled of foundry goods is thick to be 5mm, and mold material adopts the precoated sand moulding, and interior rising head is set as required; place chill; adopt counter-pressure casting technology, die cavity feeds shielding gas exhausted air, device systems pressure reduction 0.25MPa; filling velocity 20cm/s, pressing speed 1.5KPa/s.
Foundry goods is handled through solution treatment and artificial aging, parts sampling room temperature tensile strength 260MPa, and elongation 5%, room temperature 5%NaCl soak corrosion rate every square centimeter of 0.18 milligram of (0.18mg.cm every day entirely
-2d
-1).
Concrete embodiment 3:
Adopt the extrusion casting moulding of the cabin body component of magnesium alloy materials of the present invention.
Alloy compositions:
Nd 2.2(wt)％；
Gd 1.8(wt)％；
Zn 0.4(wt)％；
Zr 0.6(wt)％；
Ca 0.1(wt)％；
The total content of Fe, Cu and Ni impurity element is not more than 0.005 (wt) %;
The Mg surplus.
The melting step is:
(1) dispose alloy on request, with pure magnesium, Mg-25wt%Nd master alloy, Mg-25wt%Gd master alloy, Mg-10wt%Ca master alloy, Mg-30wt%Zr master alloy, pure Zn 150～250 ℃ of preheatings;
(2) crucible swabbing, heating, drying adds pure magnesium, heat fused at 200 ℃;
(3) melt temperature adds the Mg-25wt%Nd master alloy earlier at 700 ℃, adds Mg-25wt%Gd master alloy heat fused and stirring after the fusing again;
(4) melt temperature adds Mg-10wt%Ca master alloy and industrial-purity zinc at 720 ℃;
(5) be warming up to 760 ℃, add the Mg-30wt%Zr master alloy, after fully stirring, be cooled to 720 ℃, left standstill 10 minutes, scum and prepare casting.
The foundry goods of casting is certain cabin body component; shape " H " shape cylindrical member, intermediate interlayer, length 270mm; diameter 155mm; wall thickness 20mm, the performance requriements height adopts Extrution casting technique; mold preheating temperature is more than 250 ℃; moulding pressure 160MPa, dwell time 30s, the logical protection of casting cycle and casting mold die cavity gas.
Foundry goods is handled through solution treatment and artificial aging, parts sampling room temperature tensile strength 310MPa, and elongation 7%, room temperature 5%NaCl soak corrosion rate every square centimeter of 0.16 milligram of (0.16mg.cm every day entirely
-2d
-1).
In the examples of implementation, feed SF at step (2) crucible
6/ CO
2Mixed gas, about SF6 volume content 1Vol%, and solid solution treatment method, about 530 ℃ of temperature, 8 hours time, water or oil quenching, aging treatment method, about 210 ℃ of temperature, 12 hours time.
Claims (4)
1, a kind of high strength corrosion resistant rare earth cast magnesium alloy is characterized in that: the component of magnesium alloy and weight percent thereof are:
Nd 1.8～4.0(wt)％；
Gd 1.0～2.0(wt)％；
Zn 0.2～0.8(wt)％；
Zr 0.4～1.0(wt)％；
Ca 0.0～0.8(wt)％；
The total content of Fe, Cu and Ni impurity element is not more than 0.02 (wt) %;
Mg is a surplus, complements to 100 (wt) %.
2, a kind of preparation method of high strength corrosion resistant rare earth cast magnesium alloy is characterized in that steps in sequence is:
(1) with pure magnesium, Mg-Nd master alloy, Mg-Gd master alloy, Mg-Ca master alloy, pure Zn 150～250 ℃ of preheatings;
(2) melt pure Mg: pure magnesium is joined to brush in coating and the crucible through 150～250 ℃ of dry bakings melt, crucible feeds SF
6/ CO
2Mixed gas, SF6 volume content 0.5～2.0Vol%;
(3) add Nd and Gd: add the Mg-Nd master alloy earlier at 680～730 ℃, stir the fusing back, adds the Mg-Gd master alloy afterwards again, and fusing is also stirred melt;
(4) add Ca and Zn: add Mg-Ca master alloy and industrial-purity zinc at 700～730 ℃, melt is stirred in the fusing back;
(5) add Zr: melt temperature is risen to 760～785 ℃, add Mg-Zr master alloy and fusing, stir, left standstill afterwards 10 minutes～20 minutes, drag for removing dross, cast at 720～750 ℃.
3, preparation method according to claim 2 is characterized in that described casting adopts sand mold casting, low-pressure casting, counter-pressure casting and extrusion casting to make ingot casting or all kinds of non-diecast magnesium alloy foundry goods.
4, preparation method according to claim 3 is characterized in that described ingot casting or all kinds of non-diecast magnesium alloy foundry goods adopt following solid solution treatment method and aging treatment method:
(1) solid solution treatment method: 520～540 ℃ of temperature, 6～10 hours time, water or oil quenching;
(2) aging treatment method: 200～220 ℃ of temperature, 8～16 hours time.
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| CNA200910099330XA CN101575683A (en) | 2009-06-01 | 2009-06-01 | High strength corrosion resistant rare earth cast magnesium alloy and preparation method thereof |
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| CN102304656A (en) * | 2011-09-02 | 2012-01-04 | 吴落义 | Rare earth heat resistant magnesium alloy with high corrosion resistance |
| CN102787264A (en) * | 2012-05-24 | 2012-11-21 | 刘利涛 | High-strength and high-plasticity magnesium alloy material and preparation method thereof |
| CN103846621A (en) * | 2012-12-04 | 2014-06-11 | 中国兵器科学研究院宁波分院 | Preparation method for run-flat support body |
| WO2014171550A1 (en) * | 2013-04-15 | 2014-10-23 | 国立大学法人 熊本大学 | Fire-resistant magnesium alloy and production method therefor |
| CN104328319A (en) * | 2014-10-30 | 2015-02-04 | 华南理工大学 | Biomedical degradable Mg-Gd-Nd-Zn-Zr alloy, and preparation method and application thereof |
| CN104451307A (en) * | 2014-12-23 | 2015-03-25 | 常熟市凯波冶金建材机械设备厂 | Housing of gas turbine |
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| CN104455943A (en) * | 2014-12-23 | 2015-03-25 | 常熟市凯波冶金建材机械设备厂 | Anti-explosion gas turbine housing |
| CN104451308A (en) * | 2014-12-23 | 2015-03-25 | 常熟市凯波冶金建材机械设备厂 | Outer frame of gas engine |
| CN104630588A (en) * | 2015-01-04 | 2015-05-20 | 河南科技大学 | Magnesium-based composite material and composite cookware |
| CN107858575A (en) * | 2017-11-08 | 2018-03-30 | 中国兵器科学研究院宁波分院 | A kind of high-strength temperature-resistant casting magnesium alloy material and preparation method thereof |
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| CN113373361A (en) * | 2021-06-22 | 2021-09-10 | 河北钢研德凯科技有限公司 | High-strength cast magnesium alloy and preparation method and application thereof |
| CN115637363A (en) * | 2022-11-04 | 2023-01-24 | 南昌航空大学 | High-performance heat-resistant corrosion-resistant magnesium alloy casting and preparation method thereof |
| WO2023017280A1 (en) * | 2021-08-12 | 2023-02-16 | Magnesium Elektron Limited | Improved castable magnesium alloy |
| CN118326216A (en) * | 2024-04-11 | 2024-07-12 | 江苏海洋大学 | Preparation method of high-corrosion-resistance rare earth magnesium alloy |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102304656A (en) * | 2011-09-02 | 2012-01-04 | 吴落义 | Rare earth heat resistant magnesium alloy with high corrosion resistance |
| CN102787264A (en) * | 2012-05-24 | 2012-11-21 | 刘利涛 | High-strength and high-plasticity magnesium alloy material and preparation method thereof |
| CN103846621A (en) * | 2012-12-04 | 2014-06-11 | 中国兵器科学研究院宁波分院 | Preparation method for run-flat support body |
| WO2014171550A1 (en) * | 2013-04-15 | 2014-10-23 | 国立大学法人 熊本大学 | Fire-resistant magnesium alloy and production method therefor |
| CN104328319A (en) * | 2014-10-30 | 2015-02-04 | 华南理工大学 | Biomedical degradable Mg-Gd-Nd-Zn-Zr alloy, and preparation method and application thereof |
| CN104455943A (en) * | 2014-12-23 | 2015-03-25 | 常熟市凯波冶金建材机械设备厂 | Anti-explosion gas turbine housing |
| CN104454029A (en) * | 2014-12-23 | 2015-03-25 | 常熟市凯波冶金建材机械设备厂 | Combustion gas turbine power turbine guide blade |
| CN104454040A (en) * | 2014-12-23 | 2015-03-25 | 常熟市凯波冶金建材机械设备厂 | 350,000 KW air-cooling steam turbine internal machine base |
| CN104451306A (en) * | 2014-12-23 | 2015-03-25 | 常熟市凯波冶金建材机械设备厂 | Bearing seat for gas turbine |
| CN104451315A (en) * | 2014-12-23 | 2015-03-25 | 常熟市凯波冶金建材机械设备厂 | Inner frame of gas turbine |
| CN104451307A (en) * | 2014-12-23 | 2015-03-25 | 常熟市凯波冶金建材机械设备厂 | Housing of gas turbine |
| CN104451308A (en) * | 2014-12-23 | 2015-03-25 | 常熟市凯波冶金建材机械设备厂 | Outer frame of gas engine |
| CN104630588A (en) * | 2015-01-04 | 2015-05-20 | 河南科技大学 | Magnesium-based composite material and composite cookware |
| CN107858575A (en) * | 2017-11-08 | 2018-03-30 | 中国兵器科学研究院宁波分院 | A kind of high-strength temperature-resistant casting magnesium alloy material and preparation method thereof |
| CN112746189A (en) * | 2021-02-01 | 2021-05-04 | 太原理工大学 | Preparation method of high-toughness magnesium alloy and roll forming process of plate thereof |
| CN112746189B (en) * | 2021-02-01 | 2021-09-24 | 太原理工大学 | A kind of preparation method of high strength and toughness magnesium alloy and rolling forming process of sheet |
| CN113373361A (en) * | 2021-06-22 | 2021-09-10 | 河北钢研德凯科技有限公司 | High-strength cast magnesium alloy and preparation method and application thereof |
| WO2022268034A1 (en) * | 2021-06-22 | 2022-12-29 | 河北钢研德凯科技有限公司 | High-strength cast magnesium alloy, and preparation method therefor and application thereof |
| WO2023017280A1 (en) * | 2021-08-12 | 2023-02-16 | Magnesium Elektron Limited | Improved castable magnesium alloy |
| CN115637363A (en) * | 2022-11-04 | 2023-01-24 | 南昌航空大学 | High-performance heat-resistant corrosion-resistant magnesium alloy casting and preparation method thereof |
| CN118326216A (en) * | 2024-04-11 | 2024-07-12 | 江苏海洋大学 | Preparation method of high-corrosion-resistance rare earth magnesium alloy |
| CN118880140A (en) * | 2024-09-30 | 2024-11-01 | 山东海化集团有限公司 | A high corrosion resistance, flame retardancy and high thermal conductivity die-casting magnesium alloy and preparation method thereof |
| CN118880140B (en) * | 2024-09-30 | 2025-01-24 | 山东海化集团有限公司 | A high corrosion resistance, flame retardancy and high thermal conductivity die-casting magnesium alloy and preparation method thereof |
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