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Thermomechanical treatment method for obtaining high-strength and high-toughness magnesium alloy

A deformation heat treatment and magnesium alloy technology, applied in the field of artificial aging treatment to prepare high-strength, high-toughness magnesium alloys, and deformation heat treatment fields, can solve the problems of affecting the processing ability, poor room temperature plasticity, reduced ductility of magnesium alloys, etc., to improve the strength and equipment. Requires simple, ductile effects

Inactive Publication Date: 2011-07-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after most severe plastic deformation, the ductility of magnesium alloys will be greatly reduced, seriously affecting their subsequent processing capabilities, and magnesium alloys are usually deformed at temperatures above 200°C due to poor room temperature plasticity, and the grains are refined to 1~ 2μm has reached the limit, and it is difficult for magnesium alloys to continue to improve their strength by refining the grains

Method used

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  • Thermomechanical treatment method for obtaining high-strength and high-toughness magnesium alloy
  • Thermomechanical treatment method for obtaining high-strength and high-toughness magnesium alloy
  • Thermomechanical treatment method for obtaining high-strength and high-toughness magnesium alloy

Examples

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Comparison scheme
Effect test

Embodiment 1

[0043] Cut the AZ91 magnesium alloy ingot into rectangular blocks, place it in the furnace, heat it to 400°C for 12 hours, and then quench it with water. After holding it at 380°C for 8 minutes, place the test piece on the lower flat anvil of the hydraulic press, with the X axis as the The compression shaft undergoes compression deformation with a strain rate of 10 -3 the s -1 ; When the true strain in the X direction reaches 0.4, stop the compression and take out the test piece for water quenching, then keep it warm at 260°C for 8 minutes, rotate the test piece 90 degrees, take the Y axis as the compression axis, and compress again. When the true strain reaches 0.4, stop the compression and take out the specimen for water quenching, then keep it warm at 240°C for 8 minutes, rotate the specimen by 90 degrees, and compress again with the Z axis as the compression axis. When the true strain in the Z direction reaches 0.4, stop the compression and take out the specimen for water...

Embodiment 2

[0045] Cut AZ61 magnesium alloy extruded rods into rectangular blocks, heat them in the furnace to 450°C for 2 hours, then water quench and cool them. The axis is the compression axis for compression deformation, and the strain rate is 10 -3 the s -1 ; When the true strain in the X direction reaches 1, stop the compression and take out the specimen for water quenching, then keep it warm at 250°C for 8 minutes, rotate the specimen by 90 degrees, take the Y axis as the compression axis, and compress again. When the true strain in the Y direction reaches 1, stop the compression and take out the specimen for water quenching, then keep it warm at 220°C for 8 minutes, rotate the specimen 90 degrees, and compress it again with the Z axis as the compression axis. When the true strain in the Z direction reaches 1, stop the compression and take out the specimen for water quenching, then keep it warm at 190°C for 8 minutes, rotate the specimen 90 degrees, and take the X axis as the comp...

Embodiment 3

[0047] Cut AZ61 magnesium alloy extruded rods into rectangular blocks, place them in a furnace, heat them to 460°C for 1.5 hours, then water quench and cool them. The axis is the compression axis for compression deformation, and the strain rate is 10 -2 the s -1 ; When the true strain in the X direction reaches 0.8, stop the compression and take out the specimen for water quenching, then keep it warm at 250°C for 8 minutes, rotate the specimen 90 degrees, and compress it again with the Y axis as the compression axis. When the true strain in the Y direction reaches 0.8, stop the compression and take out the specimen for water quenching, then keep it warm at 220°C for 8 minutes, rotate the specimen by 90 degrees, take the Z axis as the compression axis, and compress again. When the true strain in the Z direction reaches 0.8, stop the compression and take out the specimen for water quenching, then keep it warm at 190°C for 8 minutes, rotate the specimen 90 degrees, and take the ...

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Abstract

The invention relates to a thermomechanical treatment method for obtaining a high-strength and high-toughness magnesium alloy. The method comprises the following steps of: cutting a magnesium alloy ingot or a thermal deformation material into rectangular blocks; putting in a furnace, heating to 400-460 DEG C, keeping the temperature for 1-15 h, quenching in water and cooling; then, sequentially cooling by passes and multiaxially compressing and deforming along the three directions, i.e. the X-axis, the Y-axis and the Z-axis of the rectangular blocks from 300-460 DEG C; deforming and cooling to 10-120 DEG C for each pass and controlling the pass to have the true strain of 0.4-1 and the stress rate of 10<-4>-10<-1>s<-1>; aging for 0.5-10 h at 100-250 DEG C when the accumulated true strain is larger than or equal to 3 or carrying out cold deformation with a certain strain before aging to obtian the high-strength and high-toughness magnesium alloy with the tensile strength greater than 450 MPa and the elongation greater than 25 percent. The invention has reasonable process design, simple equipment requirement and convenience of operation, overcomes the problem that the delay is greatly reduced when the strength of the magnesium alloy is improved through grain refinement in the prior art and has favorable industrial application prospects.

Description

technical field [0001] The invention discloses a deformation heat treatment method for obtaining high-strength and high-toughness magnesium alloys, in particular referring to the preparation of high-strength and high-toughness magnesium alloys by using cooling multiaxial deformation and artificial aging treatment. The invention belongs to the technical field of magnesium alloy processing. Background technique [0002] As the metal structure material with the lowest density, magnesium alloy has the advantages of high specific strength, high specific modulus, and electromagnetic shielding. It has important application value and broad application prospects in the fields of automobile, electronics, aerospace, and national defense. However, compared with iron and steel, the low strength and hardness of magnesium alloys seriously limit its application range, so it is of great significance to prepare magnesium alloys with high strength and high hardness. [0003] At present, the h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06
Inventor 杨续跃姜育培吴星星
Owner CENT SOUTH UNIV
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