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Aging heat treatment process for low rare earth nano isomeric magnesium alloy

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

Active Publication Date: 2018-10-26
湖南镁宇科技有限公司
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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

[0024] The atomic percentage composition of the magnesium alloy is: Mg-1.36Gd-1.03Y-0.13Zr, the extruded bar is subjected to swaging deformation at 100°C, and the deformation amount of each pass is controlled to be 15%, 15%, 10%, and the total deformation The amount is 35%, and the feeding speed is controlled to be 3 mm / min to prepare a nano-heterogeneous magnesium alloy.

[0025] The obtained nano-heterogeneous magnesium alloy was subjected to a first-stage aging treatment at 130° C. for 15 hours, and then a second-stage aging treatment was performed at 175° C. for an aging time of 20 hours. 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 85MPa, and the yield strength increased by 100MPa.

Embodiment 2

[0027] The atomic percentage composition of the magnesium alloy is: Mg-1.36Gd-1.03Y-0.13Zr, the extruded bar is subjected to swaging deformation at 100°C, and the deformation amount of each pass is controlled to be 15%, 10%, and 10%, and the total deformation The amount is 31%, and the feed rate is controlled to be 3 mm / min to prepare a nano-heterogeneous magnesium alloy.

[0028] The obtained nano-heterogeneous magnesium alloy was subjected to a first-stage aging treatment at 110° C. for 15 hours, and then a second-stage aging treatment was performed at 150° C. for an aging time of 40 hours. According to GB / T228-2002, the mechanical properties of the aged magnesium 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 90MPa, and the yield strength increased by 110MPa.

Embodiment 3

[0030] The atomic percentage composition of the magnesium alloy is: Mg-1.09Gd-0.69Y-0.14Zr, the extruded bar is subjected to swaging deformation at 200°C, and the deformation amount of each pass is controlled to be 15%, 15%, 15%, and 15%. , the total deformation is 48%, and the feeding speed is controlled to be 2mm / min to prepare nano-heterogeneous magnesium alloy.

[0031] The obtained nano-heterogeneous magnesium alloy was subjected to a first-stage aging treatment at 130° C. for 10 hours, and then a second-stage aging treatment was performed at 175° C. for 25 hours. 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 100MPa, and the yield strength increased by 115MPa.

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Abstract

The invention relates to an aging heat treatment process for a low rare earth nano isomeric magnesium alloy. The atomic compositions of the magnesium alloy comprise, by mass percentage, 1 of Mg, 0.91-1.36 of Gd, 0.87-1.29 of Y and 0.06-0.14 of Zr. The aging heat treatment process comprises the steps that rotary forging deformation is performed on an extruded bar, the rotary forging temperature iscontrolled to be 50-200 DEG C, the pass deformation amount is controlled to be 10-20%, the total deformation amount is controlled to be 5-50%, the feeding speed is controlled to be 2-4 mm / min, and thenano isomeric magnesium alloy is obtained; primary aging treatment is performed on the obtained nano isomeric magnesium alloy at 100-130 DEG C for 5-20 hours, and secondary aging treatment is performed on the alloy obtained after primary aging treatment at 130-175 DEG C for 10-40 hours; the tensile strength of the nano isomeric magnesium alloy obtained after aging treatment is improved by 80-120MPa and the yield strength is improved by 80-120 MPa compared with the alloy in the non-aged state.

Description

technical field [0001] The invention relates to the field of nano-metal material processing, 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 pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06C22C23/06
CPCC22C23/06C22F1/06
Inventor 万迎春刘楚明高永浩蒋树农余世伦
Owner 湖南镁宇科技有限公司
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