CN104131143B - A kind of method for preparing magnesium alloy ultra-thin strip - Google Patents

Abstract

The present invention is a kind of method preparing magnesium alloy ultrathin band.First solid solution magnesium alloy ingot is carried out shrend under inert gas shielding after 723 803K are incubated 24 hours, ingot blank is carried out solutionizing process；The ingot casting of solution treatment being cut into desired thickness size, carries out multi-pass rolling at thermal process status, then total deflection need to carry out the annealing of 30 minutes more than 60% to hot rolled plate at 673 773K.At ambient temperature, annealing hot rolled plate is carried out cold rolling more than 50% of the first pass deformation, can be by one or multi-channel ultra-thin band (paper tinsel) material time being cold rolled to different-thickness.Maximum reduction can reach 95%, rolls and can reach 1000% to elongation.Cold rolling superthin band is in addition to the limit caused due to heavy reduction occur and splitting, and integral surface is intact.Available high-quality magnesium alloy ultrathin band in uniform thickness after cutting edge.Cold-reduced sheet uniform small grains after annealing, excellent in mechanical performance.

Description

A kind of method for preparing magnesium alloy ultra-thin strip

technical field

The invention relates to the field of magnesium alloy processing, in particular to a method for preparing ultra-thin strips of magnesium alloy by cold rolling.

Background technique

The development and application of wrought magnesium alloys has attracted more and more attention due to the demand for lightweighting of automobiles, aviation, aerospace, electronics, and office systems, as well as environmental protection issues. Although my country is a major producer and exporter of magnesium, magnesium alloy plates (strips), especially in the fields of precision electronic appliances, high-power magnesium anode batteries, and aerospace fields, need to be applied to ultra-thin magnesium with a thickness of less than 0.5mm. Most of the deep-processed products such as alloy plates (strips) rely on imports. At present, the final rolling stage of the ultra-thin magnesium alloy plate (strip) with a thickness of less than 0.5mm produced at home and abroad requires hot rolling, supplemented by intermediate annealing. However, in the production process of magnesium alloy sheet, the rolling of magnesium sheet below 1mm is the most prone to cracks. The reason is that reversible rolling mills are commonly used in industrial production. The roll temperature is not enough. Therefore, how to realize the preparation of magnesium alloy plate (strip) material, especially ultra-thin plate (strip) material by rapid cold rolling process, and then continuously produce high-formability ultra-thin plate (strip) material in large quantities, is to realize the magnesium alloy The key is to advance from primary processing to deep processing.

At present, magnesium and magnesium alloy ultra-thin plates (strips) are generally prepared by hot rolling process, and heating and heat preservation are required for each pass, which wastes energy and has limited grain refinement effect.

Contents of the invention

In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a method for preparing ultra-thin magnesium alloy strips with a thickness of less than 0.5mm by cold rolling, and the prepared ultra-thin magnesium alloy plates (strips) The grains of the material are fine, the structure is uniform, and the defects are few.

The present invention adopts following technical scheme:

A method for preparing magnesium alloy ultra-thin strips, comprising the steps of:

1) Ingot solution treatment

The solid solution type magnesium alloy ingot is kept at 723-803K for 24 hours under the protection of an inert gas, and then water quenched to carry out solid solution treatment on the ingot;

2) Ingot hot rolling billet

Cut the solution-treated ingot into a plate with a thickness greater than 2.5mm, and perform hot rolling deformation to a thickness of about 1mm, satisfying that the total deformation of hot rolling is at least 60%, and the hot rolling temperature is set between 677-727K; The rolled plate is annealed at 673-773K for 30 minutes;

3) Ultra-thin strip cold rolling treatment

At room temperature, the annealed hot-rolled plate in step 2) is rolled with a deformation of more than 50% in the first pass, and can be cold-rolled into an ultra-thin strip with a thickness of 0.05mm-0.5mm by one or more passes , the total reduction can reach 95%.

Further, the solid solution magnesium alloy is an alloy formulated with pure Mg and Er elements according to the mass ratio of Mg-4Er; or an alloy formulated with pure Mg and Zn elements according to the mass ratio of Mg-1Zn; or pure Mg, Dy element, the alloy prepared according to the mass ratio of Mg-6Dy; or the alloy prepared with pure Mg and Al elements according to the mass ratio of Mg-1Al.

Further, in step 2), the hot rolling is carried out in multiple passes, and the deformation of each pass is controlled below 10%, supplemented by intermediate annealing.

Further, in step 3), the deformation amount of the first pass satisfies 50% to 70%.

The present invention has following advantage and beneficial effect:

This method uses fewer steps and realizes the preparation of magnesium alloy ultra-thin strips at room temperature. Due to the use of hot-rolled blanking and cold-rolled ultra-thin treatment, energy is saved. Except for the edge crack caused, the overall surface is intact. High-quality magnesium alloy ultra-thin strips can be obtained after trimming. After annealing, the cold-rolled sheet has fine and uniform grains and excellent mechanical properties.

Through the detection of surface morphology and thickness, the thickness of the obtained magnesium alloy ultra-thin strip is less than 0.5mm, and the strip has fine grains, uniform structure, few defects, and weakened basal surface texture. Due to the small grain size, the mechanical, corrosion resistance and electrochemical properties are improved.

The present invention has developed a magnesium alloy material with extremely high room temperature rolling deformation capacity and its technology. The technology developed is to realize the room temperature rolling of the magnesium alloy and obtain a cold-rolled ultra-thin plate (foil) with excellent performance. The cold-rolled magnesium alloy sheet can be processed into various forms of products, and is widely used in automobiles, 3C industries and aerospace.

The price of Mg-Er and Mg-Zn alloys is relatively cheap, the material preparation process is simple, and the alloy can be realized by conventional processes. Industrialization investment can use existing equipment for general factories, and the investment is low.

The deformation of magnesium at room temperature mainly depends on the sliding of the basal plane {0001} and the twinning of the cone plane. However, the annealed texture of the solution-treated magnesium alloy weakens after hot rolling. Under the large strain rate in the first pass, the rolling normal stress will cause a large number of {10- 11} Compression twins, the generation of a large number of {10-11} compression twins will change the grain orientation, so that the grains are conducive to the generation of basal {0001} slip and cone twinning, thereby achieving uniform plastic deformation.

Description of drawings

Fig. 1 is the microstructure of the Mg-4Er alloy ultra-thin strip (673K/30min annealing) of Example 1 of the present invention;

Fig. 2 is an ultra-thin strip of magnesium alloy with a thickness of 0.05 mm for solid solution Mg-4Er alloy in Example 1 of the present invention.

detailed description

Below in conjunction with accompanying drawing and embodiment the present invention is described in detail:

In the present invention, the solid solution type magnesium alloy ingot is kept at an absolute temperature of 723-803K for 24 hours under the protection of an inert gas, and then water quenched to perform solution treatment on the ingot; the ingot subjected to solution treatment is cut into thickness greater than 2.5mm The plate is hot-rolled and deformed to a thickness of about 1mm. The hot-rolled rolling is carried out in multiple passes, and the deformation of each pass is controlled at less than 10%, supplemented by intermediate annealing, so that the minimum total deformation of hot-rolling is 60%. The rolling temperature is set between 677-727K; then the hot-rolled sheet is annealed at 673-773K for 30 minutes; at room temperature, the deformation of the first pass of step 2) annealing the hot-rolled sheet is 50%~ 70% rolling can be cold rolled into ultra-thin strips with a thickness of 0.05mm-0.5mm through one or more passes, and the total reduction can reach 95%. The rolling elongation can reach 1000%. Except for edge cracks caused by large reduction, the cold-rolled ultra-thin strip has a good overall surface, and high-quality magnesium alloy ultra-thin strips can be obtained after edge trimming

Example 1

The pure Mg element and Er element are used to prepare the alloy according to Mg-4Er (mass ratio). The solid solution magnesium alloy ingot was kept at 773K for 24 hours under the protection of an inert gas, and then water quenched to perform solid solution treatment on the ingot. Cut the solution-treated billet into 4mm thickness for hot rolling and deformation. The absolute temperature of hot rolling is 667K. The hot rolling is carried out in multiple passes, and the deformation of each pass is controlled at 10%, supplemented by intermediate annealing. The amount of deformation reaches 75%, and the thickness of the plate is rolled to about 1mm, and then annealing is carried out at an absolute temperature of 673K for 30 minutes to improve the plasticity of the plate. Under room temperature conditions, the annealed hot-rolled plate is cold-rolled with a deformation of 50% in the first pass, and can be cold-rolled into an ultra-thin strip (foil) with a thickness of 0.05mm through multiple passes. The total reduction can reach 95%, and the rolling elongation can reach 1000%. The microstructure of the obtained magnesium alloy ultra-thin strip was observed, as shown in Figure 1, the structural grains are fine, the structure is uniform, the defects are few, and the texture of the basal surface is weakened.

As shown in Figure 2, except for edge cracks caused by large reductions, the cold-rolled ultra-thin strip has a good overall surface, and high-quality magnesium alloy ultra-thin strips can be obtained after edge trimming.

Example 2

The pure Mg element and Zn element are used to prepare the alloy according to Mg-1Zn (mass ratio). The prepared solid solution magnesium alloy ingot was kept at 723K for 24 hours under the protection of an inert gas, and then water quenched, and the ingot was subjected to solution treatment. Cut the solution-treated ingot into 8mm thickness for hot rolling and deformation. The hot rolling temperature is 800K. The hot rolling is carried out in multiple passes. The deformation of each pass is controlled at 9%, supplemented by intermediate annealing. The total deformation To reach 150%, the plate thickness is rolled to about 1mm, and then annealed at 690K for 30 minutes to improve the plasticity of the plate. Under room temperature conditions, the annealed hot-rolled plate is cold-rolled with a deformation of 60% in the first pass, and can be cold-rolled into an ultra-thin strip (foil) with a thickness of 0.1mm through multiple passes. The maximum reduction can reach 95%, and the rolling elongation can reach 1000%. Except for edge cracks caused by large reduction, the cold-rolled ultra-thin strip has a good overall surface, and high-quality magnesium alloy ultra-thin strip can be obtained after edge trimming.

Through the SEM detection of the obtained magnesium alloy ultra-thin strip, the structural grains are fine, the structure is uniform, the defects are few, and the texture of the basal surface is weakened.

Example 3

The pure Mg element and Dy element are used to prepare the alloy according to Mg-6Dy (mass ratio). The solid solution magnesium alloy ingot was kept at 803K for 24 hours under the protection of an inert gas, and then water quenched, and the ingot was subjected to solution treatment. Cut the solution-treated ingot into 6mm thickness for hot rolling deformation, hot rolling for multi-pass rolling, the deformation of each pass is controlled at 5%, supplemented by intermediate annealing, the total deformation reaches 90%, the plate The thickness is rolled to about 1mm, and then annealed at 773K for 30 minutes to improve the plasticity of the plate. Under room temperature conditions, the annealed hot-rolled plate is cold-rolled with a deformation of 70% in the first pass, and can be cold-rolled into an ultra-thin strip (foil) with a thickness of one pass. The total reduction can reach 95%, and the rolling elongation can reach 1000%. Except for edge cracks caused by large reduction, the cold-rolled ultra-thin strip has a good overall surface, and high-quality magnesium alloy ultra-thin strip can be obtained after edge trimming.

Through the SEM detection of the obtained magnesium alloy ultra-thin strip, the structural grains are fine, the structure is uniform, the defects are few, and the texture of the basal surface is weakened.

Example 4

The pure Mg element and Al element are used to prepare the alloy according to Mg-1Al (mass ratio). The solid solution magnesium alloy ingot was kept at 773K for 24 hours under the protection of an inert gas, and then water quenched to perform solid solution treatment on the ingot. Cut the solution-treated billet into 4mm thickness for hot rolling and deformation, hot rolling is carried out in multiple passes, and the deformation of each pass is controlled at 5%, supplemented by intermediate annealing, the total deformation reaches more than 75%. The plate thickness is rolled to about 1mm, and then annealed at 673K for 30 minutes to improve the plasticity of the plate. At room temperature, the annealed hot-rolled plate is cold-rolled with a deformation of 65% in the first pass, and can be cold-rolled into an ultra-thin strip (foil) by one or more passes. The total reduction can reach 95%, and the rolling elongation can reach 1000%. Except for edge cracks caused by large reduction, the cold-rolled ultra-thin strip has a good overall surface, and high-quality magnesium alloy ultra-thin strip can be obtained after edge trimming.

Example 5

The pure Mg element and Sn element are used to prepare the alloy according to Mg-1Sn (mass ratio). The solid solution magnesium alloy ingot was kept at 763K for 24 hours under the protection of an inert gas, and then water quenched, and the ingot was subjected to solution treatment. Cut the solution-treated billet into 4mm thickness for hot rolling and deformation. The hot rolling is carried out in multiple passes, and the deformation of each pass is controlled at 10%, supplemented by intermediate annealing. The total deformation reaches more than 75%. The plate thickness is rolled to about 1mm, and then annealed at 693K for 30 minutes to improve the plasticity of the plate. Under room temperature conditions, the annealed hot-rolled plate is cold-rolled in the first pass with a deformation greater than 50%, and can be cold-rolled into ultra-thin strips (foils) of different thicknesses through one or more passes. The total reduction can reach 90%, and the rolling elongation can reach 900%. Except for edge cracks caused by large reduction, the cold-rolled ultra-thin strip has a good overall surface, and high-quality magnesium alloy ultra-thin strip can be obtained after edge trimming.

Except for edge cracks caused by large reduction, the cold-rolled ultra-thin strip has a good overall surface, and high-quality magnesium alloy ultra-thin strip can be obtained after edge trimming.

Claims (3)

1. a method for preparing magnesium alloy ultra-thin strip, is characterized in that, comprises the following steps: 1) Ingot solution treatment The solid solution type magnesium alloy ingot is kept at 723-803K for 24 hours under the protection of an inert gas, and then water quenched to carry out solid solution treatment on the ingot; 2) Ingot hot rolling billet Cut the solution-treated ingot into a plate with a thickness greater than 2.5mm, and perform hot rolling deformation to a thickness of about 1mm, satisfying that the total deformation of hot rolling is at least 60%, and the hot rolling temperature is set between 677-727K; The rolled plate is annealed at 673-773K for 30 minutes; 3) Ultra-thin strip cold rolling treatment Under room temperature conditions, the annealed hot-rolled plate in step 2) is rolled with a deformation amount greater than 50% in the first pass, and is cold-rolled into an ultra-thin strip with a thickness of 0.05mm-0.5mm by one or more passes, The total reduction can reach 95%; The solid solution magnesium alloy is an alloy prepared by using pure Mg and Er elements according to the mass ratio of Mg-4Er; or an alloy prepared by using pure Mg and Zn elements according to the mass ratio of Mg-1Zn; or using pure Mg and Dy elements, The alloy prepared according to the mass ratio of Mg-6Dy; or the alloy prepared according to the mass ratio of Mg-1Al using pure Mg and Al elements. 2. according to the method for preparing magnesium alloy ultra-thin strip according to claim 1, it is characterized in that, in step 2), hot rolling is carried out multi-pass rolling, and the amount of deformation of each pass is controlled below 10%, and auxiliary Annealed in between. 3. The method for preparing magnesium alloy ultra-thin strips according to claim 1, characterized in that, in step 3), the deformation amount of the first pass satisfies 50% to 70%.