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

A magnesium alloy and ultra-high-strength technology, applied in the field of ultra-high-strength nano-heterogeneous magnesium alloy preparation, can solve the problems of low mechanical properties of magnesium alloys, achieve high strain rate, reduce cracking tendency, and improve the effect of total deformation

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 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 of magnesium alloys and preparing high-strength or even ultra-high-strength magnesium alloys are important goals of magnesium alloy research.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] a. The mass percentage composition of the magnesium alloy is: Mg-8.0Gd-3.0Y-0.4Zr-0.05Ag-0.03Er, the magnesium alloy ingot is prepared by a semi-continuous casting method, and homogenized heat treatment is performed;

[0019] b. Extruding and deforming the homogenized alloy billet;

[0020] c. The extruded bar is subjected to swaging deformation at 125°C, the deformation of each pass is controlled at 15%, 15%, 10%, the total deformation is 35%, and the feeding speed is controlled at 4mm / min. After every 2 passes of deformation Changing the feeding direction, the obtained nano-heterogeneous magnesium alloy grain size is 30nm~2μm, and the finished product size is 20mm in diameter and 2000mm in length;

[0021] d. The swaged bar is subjected to aging heat treatment.

[0022] According to GB / T228-2002, the mechanical properties of the obtained nano-heterogeneous magnesium alloy were tested, and the results are shown in Table 1.

Embodiment 2

[0024] a. The mass percentage composition of the magnesium alloy is: Mg-8.0Gd-3.0Y-0.4Zr-0.05Ag-0.03Er, the magnesium alloy ingot is prepared by a semi-continuous casting method, and homogenized heat treatment is performed;

[0025] b. Extruding and deforming the homogenized alloy billet;

[0026] c. The extruded bar is subjected to rotary forging deformation at 250°C, the deformation of each pass is controlled at 15%, 10%, 10%, the total deformation is 31%, and the feeding speed is controlled at 4mm / min. After every 2 passes of deformation Changing the feeding direction, the obtained nano-heterogeneous magnesium alloy grain size is 50nm~2μm, and the finished product size is 30mm in diameter and 2000mm in length;

[0027] d. The swaged bar is subjected to aging heat treatment.

[0028] According to GB / T228-2002, the mechanical properties of the obtained nano-heterogeneous magnesium alloy were tested, and the results are shown in Table 1.

Embodiment 3

[0030] a. The mass percentage composition of the magnesium alloy is: Mg-8.0Gd-3.0Y-0.4Zr-0.05Ag-0.03Er, the magnesium alloy ingot is prepared by a semi-continuous casting method, and homogenized heat treatment is performed;

[0031] b. Extruding and deforming the homogenized alloy billet;

[0032] c. The extruded bar is subjected to swaging deformation at 200°C, the deformation of each pass is controlled at 15%, 15%, 15%, the total deformation is 39%, and the feeding speed is controlled at 5mm / min. After every 2 passes of deformation Changing the feeding direction, the grain size of the obtained nano-heterogeneous magnesium alloy is 70nm~1μm, and the finished product size is 14mm in diameter and 1000mm in length;

[0033] d. The swaged bar is subjected to aging heat treatment.

[0034] According to GB / T228-2002, the mechanical properties of the obtained nano-heterogeneous 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 isomeric 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 of the magnesium alloy to be subjected to homogenization treatment, then squeezing to form a bar, enabling the squeezed bar to be subjected to rotary forging deformation, controlling rotary forging temperature at 100-370 DEG C, controlling pass deformation amount to be 10-20% and total deformation amount to be 5-60%, controlling feed rate to be 3-6mm / min, changing feed directions after the two pass deformations each time to prepare the nano isomeric magnesium alloy of which the diameter is 3-30mm, the length is 1,000-2,000mm and the grain sizes are 30nm-2mu m. For the alloy which is combined with subsequent thermal treatment, the tensile strength at room temperature is greater than or equal to 570MPa, the yield strength is greater than or equal to 470MPa, and the elongation percentage after fracture is greater than or equal to 6%.

Description

technical field [0001] The invention belongs to the field of preparation of ultra-high-strength magnesium alloys, in particular to a preparation method of ultra-high-strength nano-heterogeneous 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 of magnesium alloys and preparing high-strength or even ultra-high-strength magnesium alloys are important goals of magnesium alloy research. Nano-heterogeneous metal materials are an effective strengthening method for metal material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22F1/06
CPCC22C23/06C22F1/06
Inventor 万迎春刘楚明高永浩陈志永
Owner CENT SOUTH UNIV
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