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Preparation method of VW93M super-high-strength nano gradient magnesium alloy

A magnesium alloy, ultra-high-strength technology, applied in the field of ultra-high-strength nano-gradient magnesium alloy preparation, can solve the problems of lack of nano-gradient magnesium alloy methods, achieve high hydrostatic stress, high strain rate, and reduce the effect of cracking tendency

Inactive Publication Date: 2018-11-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current methods for preparing nanogradient magnesium alloys are scarce, and it is urgent to develop new methods for preparing nanogradient magnesium alloys.

Method used

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  • Preparation method of VW93M super-high-strength nano gradient magnesium alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] a. The magnesium alloy used is Mg-8.0Gd-3.0Y-0.4Zr-0.05Ag-0.03Er, and the magnesium alloy ingot is prepared by a semi-continuous casting method and subjected to homogenization heat treatment;

[0018] b. Extruding and deforming the homogenized alloy billet;

[0019] c. The extruded bar was subjected to rotary forging deformation at 125°C. The deformation of each pass was 20%, 10%, 10%, and 5%, respectively, and the total deformation was 38%. The feeding speed was controlled at 4mm / min. During the deformation process The feeding direction remains unchanged, and the grain size of the obtained nanogradient magnesium alloy rod gradually increases from the center to the edge. The size is 20mm in diameter and 2000mm in length;

[0020] d. The swaged bar is subjected to aging heat treatment.

[0021] According to GB / T228-2002, the mechanical properties of the obtained nano-gradient magnesium alloy were tested, and the results are shown in Table 1.

Embodiment 2

[0023] a. The magnesium alloy used is Mg-8.0Gd-3.0Y-0.4Zr-0.05Ag-0.03Er, and the magnesium alloy ingot is prepared by a semi-continuous casting method and subjected to homogenization heat treatment;

[0024] b. Extruding and deforming the homogenized alloy billet;

[0025] c. The extruded bar is subjected to rotary forging deformation at 150°C, the deformation of each pass is 15%, 10%, 10%, and the total deformation is 31%, the feeding speed is controlled at 4mm / min, and the feeding direction during the deformation process is Keeping the same, the grain size of the obtained nanogradient magnesium alloy rod gradually increases from the center to the edge, the grain size of the center is 50-100nm, the grain size of the edge is 1-2μm, and the finished rod size is diameter 30mm, length 2000mm;

[0026] d. The swaged bar is subjected to aging heat treatment.

[0027] According to GB / T228-2002, the mechanical properties of the obtained nano-gradient magnesium alloy were tested...

Embodiment 3

[0029] a. The magnesium alloy used is Mg-8.0Gd-3.0Y-0.4Zr-0.05Ag-0.03Er, and the magnesium alloy ingot is prepared by a semi-continuous casting method and subjected to homogenization heat treatment;

[0030] b. Extruding and deforming the homogenized alloy billet;

[0031] c. The extruded bar was subjected to rotary forging deformation at 200°C, the deformation of each pass was 20%, 10%, 10%, 5%, and the total deformation was 38%, and the feeding speed was controlled at 2mm / min. During the deformation process The feeding direction remains unchanged, and the grain size of the obtained nanogradient magnesium alloy rod gradually increases from the center to the edge. The size is 14mm in diameter and 1000mm in length;

[0032] d. The swaged bar is subjected to aging heat treatment.

[0033] According to GB / T228-2002, the mechanical properties of the obtained nano-gradient magnesium alloy were tested, and the results are shown in Table 1.

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Abstract

The invention relates to a preparation method of VW93M super-high-strength nano gradient magnesium alloy. The magnesium alloy is prepared from the following ingredients by mass percent: Mg, 8.0-9.6% of Gd, 1.8-3.2% of Y, 0.3-0.7% of Zr, 0.02-0.5% of Ag and 0.02-0.3% of Er, and the method comprises the following steps of enabling a semicontinuous casting ingot blank to be subjected to homogenization treatment, then squeezing to form a bar, afterwards, carrying out rotary forging deformation, controlling rotary forging temperature at 100-380 DEG C, pass deformation amount to be 5-20%, total deformation amount to be 5-60% and feed rate to be 1-4mm / min, keeping the feed direction unchangeable during deformation to prepare a nano gradient magnesium alloy bar of which the diameter is 3-30mm andthe length is 1,000-2,000mm. From the core of the bar to a side part, the grain sizes gradually increase from 30-100nm to 1-2 mu m, for the alloy which is combined with subsequent thermal treatment, the tensile strength at room temperature is greater than or equal to 530MPa, the yield strength is greater than or equal to 460MPa, and the elongation percentage after fracture is greater than or equalto 8%.

Description

technical field [0001] The invention belongs to the field of preparation of ultrahigh-strength magnesium alloys, in particular to a preparation method of ultrahigh-strength nano-gradient magnesium alloys. Background technique [0002] 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 existing magnesium alloys are relatively low, and it is difficult to meet the demand for high-performance materials in aerospace and other fields. Therefore, improving the strength and toughness of magnesium alloys is an important goal of magnesium alloy research. Nano-gradient metal materials are a method developed in recent years to prepare high-strength and tough metal materials. Exploring new technologies for prep...

Claims

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Application Information

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IPC IPC(8): C22C23/06C22F1/06B21J5/02
CPCB21J5/02C22C23/06C22F1/06
Inventor 万迎春刘楚明高永浩蒋树农
Owner CENT SOUTH UNIV
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