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Mg-Gd-Y-Zr nano isomerism magnesium alloy aging heat treatment technology

A technology of aging heat treatment and aging treatment, which is applied in the field of nano-metal materials, can solve the problems of low mechanical properties of magnesium alloys and difficulty in meeting the needs of high-performance materials, and achieve the effect of eliminating internal stress and preventing grain growth

Inactive Publication Date: 2018-11-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanical properties of existing magnesium alloys are relatively low, and it is difficult to meet the demand for high-performance materials in aerospace and other fields.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The mass percentage composition of the magnesium alloy used is: Mg-8.0Gd-3.0Y-0.4Zr. The bar is subjected to swaging deformation at 125 °C, and the deformation of the control pass is 15%, 15%, 10%, and the total deformation is 35%. %, the feeding speed is controlled to be 2mm / min, and the nano-magnesium alloy is prepared. The obtained nano-magnesium alloy is subjected to a first-stage aging treatment at 135° C. for 15 hours, and then the nano-magnesium alloy after the primary aging treatment is subjected to a second-stage aging treatment at 200° C. for an aging time of 30 hours.

[0024] According to GB / T228-2002, the mechanical properties of the aged alloy were tested and compared with the alloy before aging. The results showed that compared with the unaged nano-heterogeneous magnesium alloy, the tensile strength of the aged alloy increased by 140MPa, and the yield strength increased by 130MPa.

Embodiment 2

[0026] The mass percentage composition of the magnesium alloy used is: Mg-8.0Gd-3.0Y-0.4Zr. The bar is subjected to swaging deformation at 125 °C, and the deformation of the control pass is 15%, 15%, 10%, and the total deformation is 35%. %, the feeding speed is controlled to be 2mm / min, and the nano-magnesium alloy is prepared. The obtained nano-magnesium alloy is subjected to a first-stage aging treatment at 135° C. for 15 hours, and then the nano-magnesium alloy after the primary aging treatment is subjected to a second-stage aging treatment at 200° C. for an aging time of 60 hours.

[0027] According to GB / T228-2002, the mechanical properties of the aged magnesium alloy were tested and compared with the pre-aging alloy. The results showed that compared with the unaged nano-heterogeneous magnesium alloy, the tensile strength of the aged alloy increased by 175MPa, and the yield strength increased by 155MPa.

Embodiment 3

[0029] The mass percentage composition of the magnesium alloy used is: Mg-8.0Gd-3.0Y-0.4Zr. The bar is subjected to swaging deformation at 125 °C, and the deformation of the control pass is 15%, 15%, 10%, and the total deformation is 35%. %, the feeding speed is controlled to be 2mm / min, and the nano-magnesium alloy is prepared. The obtained nano-magnesium alloy is subjected to a first-stage aging treatment at 135° C. for 12 hours, and then the nano-magnesium alloy after the primary aging treatment is subjected to a second-stage aging treatment at 200° C. for an aging time of 50 hours.

[0030] According to GB / T228-2002, the mechanical properties of the aged magnesium alloy were tested and compared with the pre-aging alloy. The results showed that compared with the unaged nano-heterogeneous magnesium alloy, the tensile strength of the aged alloy increased by 110MPa, and the yield strength increased by 130MPa.

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Abstract

The invention relates to an Mg-Gd-Y-Zr nano isomerism magnesium alloy aging heat treatment technology. A magnesium alloy comprises, by mass, 7-9% of Mg, 2.5-3.5% of Gd, 0.2-0.45% of Y and the balanceZr. An alloy bar is subjected to rotary forging deformation, the rotary forging temperature is controlled to be 0-250 DEG C, the pass deformation is controlled to be 5-20%, the total deformation is controlled to be 20-60%, the feeding speed is controlled to be 2-6 mm / min, and the nano isomerism magnesium alloy is prepared. The nano isomerism magnesium alloy is subjected to first-order aging treatment under the temperature of 100-150 DEG C, and the treatment time is 5-20 h; the alloy after being subjected to first-order aging treatment is subjected to second-order aging treatment under the temperature of 160-220 DEG C, and the treatment time is 10-60 h; and after aging treatment, compared with the nano isomerism magnesium alloy which is in a non-aging state, the tensile strength is improvedby 100-180 MPa, and the yield strength is improved by 100-180 MPa.

Description

technical field [0001] The invention relates to the field of nano-metal materials, in particular to a nano-heterogeneous magnesium alloy aging heat treatment process. Background technique [0002] Nanostructured materials have excellent physical, chemical and mechanical properties, and have broad application prospects. However, nanostructured materials have low plasticity and are difficult to prepare, which seriously hinders their research and application. Compared with nanostructured materials, nanoheterogeneous materials have the advantages of higher plasticity and easier preparation, and have extremely high application research value. [0003] Magnesium alloy has the advantages of low density, high specific strength, high specific stiffness, and high damping. As a new generation of lightweight structural materials, its excellent weight reduction characteristics are of great significance to aerospace, transportation and other fields. However, the mechanical properties of...

Claims

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Application Information

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IPC IPC(8): C22F1/06C22C23/06
CPCC22C23/06C22F1/06
Inventor 万迎春刘楚明蒋树农高永浩
Owner CENT SOUTH UNIV