Deformation heat treatment method for toughening high-performance deformation rare-earth magnesium alloy

A technology of deformation heat treatment and deformation of magnesium alloys, which is applied in the field of alloys, can solve the problems of difficult mass production, complicated process methods, and long cycle times, and achieve the advantages of large-scale industrial application, stable chemical properties, and reduced tensile strength. Effect

Active Publication Date: 2019-04-09
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention aims at the poor toughness of existing high-performance deformed rare-earth magnesium alloys, and the existing multiple extrusion, extrusion rolling and equal channel angle extrusi...

Method used

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  • Deformation heat treatment method for toughening high-performance deformation rare-earth magnesium alloy
  • Deformation heat treatment method for toughening high-performance deformation rare-earth magnesium alloy
  • Deformation heat treatment method for toughening high-performance deformation rare-earth magnesium alloy

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Embodiment 1

[0027] Select an ingot with the composition of Mg-11Gd-4Y-0.5Zr, cut it to make a cylindrical sample with a diameter of 40mm and a height of 40mm, and then perform homogenization treatment, that is, place the sample in a tube-type tube protected by argon gas. In the heat treatment furnace, heat up to 525°C with the furnace, keep it warm for 24 hours, and then place it in boiling water at 100°C for quenching. Then put the homogenized cylindrical sample into a tubular heat treatment furnace, preheat it at 410°C for 1 hour and then quench it in boiling water at 100°C, and cut the preheated cylindrical sample into a diameter of 37mm , a cylindrical sample with a height of 38mm, placed in the ingot barrel of a press and heated to an extrusion temperature of 410°C for 8 minutes, then subjected to hot extrusion deformation treatment at an extrusion speed of 1mm / s and an extrusion ratio of 10:1 to obtain a diameter 12mm bar. The bar is processed into a tensile test bar, and then the ...

Embodiment 2

[0029] Select an ingot with the composition of Mg-11Gd-4Y-0.5Zr, cut it to make a cylindrical sample with a diameter of 40mm and a height of 40mm, and then perform homogenization treatment, that is, place the sample in a tube-type tube protected by argon gas. In the heat treatment furnace, heat up to 525°C with the furnace, keep it warm for 24 hours, and then place it in boiling water at 100°C for quenching. Then put the homogenized cylindrical sample into a tubular heat treatment furnace, preheat it at 410°C for 9 hours, then place it in boiling water at 100°C for quenching, and cut the preheated cylindrical sample into a diameter of 37mm , a cylindrical sample with a height of 38mm, placed in the ingot barrel of a press and heated to an extrusion temperature of 410°C for 8 minutes, then subjected to hot extrusion deformation treatment at an extrusion speed of 1mm / s and an extrusion ratio of 10:1 to obtain a diameter 12mm bar. The bar is processed into a tensile test bar, an...

Embodiment 3

[0031] The steps are the same as in Example 1, except that the alloy is changed to Mg-11Gd-4Y-1Zn-0.5Zr alloy. Its yield strength is 376MPa, tensile strength is 440MPa, and elongation is 10.8%.

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Abstract

The invention relates to a deformation heat treatment method for toughening high-performance deformation rare-earth magnesium alloy, and belongs to the technical field of the alloy. The method comprises the following steps that 1) homogenizing heat treatment is performed; 2) pre-annealing heat treatment before deformation is performed, wherein pre-aging treatment is performed on an ingot blank needing to be extruded to deform at an extrusion temperature for 0.1h to 9h; 3) reverse extrusion deformation treatment is performed, wherein extrusion deformation treatment is performed on the pre-agedsample, the extrusion temperature is 400 DEG C to 450 DEG C, the extrusion ratio is 10:1 to 20:1, and the extrusion speed is 1 mm/s; and 4) aging heat treatment is performed, wherein T6 aging heat treatment is performed on the sample obtained after extrusion deformation. According to the deformation heat treatment method, the purposes that the toughness of the alloy can be obviously enhanced whilethe high strength is kept can be achieved, and the problem that the deformed magnesium alloy is high in strength and low in toughness is solved.

Description

technical field [0001] The invention relates to a deformation heat treatment method for improving the toughness of a deformed magnesium alloy, in particular to a treatment method for improving the toughness of a high-strength deformed rare earth magnesium alloy by using a thermal annealing process before deformation, and belongs to the field of alloy technology. Background technique [0002] Magnesium alloy is the lightest structural metal material with a density of 1.75-1.90g / cm 3 , only 2 / 3 of aluminum alloy, 1 / 4 of steel. Compared with other metal structural materials, magnesium alloy has a series of advantages such as high specific strength, specific stiffness, shock absorption, electromagnetic shielding and radiation resistance, easy cutting, easy recycling, etc. It is widely used in automobiles, electronic appliances, communications, The aerospace and national defense military industry has extremely important application value and broad application prospects. It is th...

Claims

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Application Information

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IPC IPC(8): C22F1/06C22C23/06
CPCC22C23/06C22F1/002C22F1/06
Inventor 于子健杜文博刘轲李淑波王朝辉杜宪赵晨辰
Owner BEIJING UNIV OF TECH
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