Preparation method of ultrahigh-strength Mg-Gd-Y-Zr nano-isomer magnesium alloy

A magnesium alloy and ultra-high-strength technology, which is applied in the field of ultra-high-strength nano-heterogeneous magnesium alloy preparation, can solve the problems of low mechanical properties of magnesium alloys, and achieve the advantages of increasing the total deformation of rotary forging, reducing the size of defects, and reducing the number of alloy defects. Effect

Inactive Publication Date: 2018-11-13
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 used is Mg-8Gd-3Y-0.4Zr, the magnesium alloy ingot is prepared by a semi-continuous casting method, and the homogenization heat treatment is carried out;

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

[0020] c. The extruded bar is subjected to rotary forging deformation at 25°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 used is Mg-8Gd-3Y-0.4Zr, the magnesium alloy ingot is prepared by a semi-continuous casting method, and the homogenization heat treatment is carried out;

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

[0026] c. The extruded bar is subjected to rotary forging deformation at 150°C, the deformation of each pass is controlled at 15%, 10%, and 10%, the total deformation is 31%, and the feed rate 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 used is Mg-8Gd-3Y-0.4Zr, the magnesium alloy ingot is prepared by a semi-continuous casting method, and the homogenization heat treatment is carried out;

[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 an ultrahigh-strength Mg-Gd-Y-Zr nano-isomer magnesium alloy. The magnesium alloy comprises, by mass, Mg, 7-9% of Gd, 2.5-3.5% of Y and 0.2-0.45% of Zr, a magnesium alloy semi-continuous casting ingot blank is subjected to homogenization treatment and then is extruded into a bar material, rotary forging deformation is carried out on the extruded rodmaterial, the rotary forging temperature is controlled to be from 0 DEG C to 350 DEG C, the deformation amount of the control channel is controlled to be 10-20%, the total deformation is 5-60%, the feeding speed is controlled to be 3-8 mm/min, the feeding direction is changed after every two times of deformation, the diameter is 3-30 mm, the length is 1000-2000 mm, nano-heterogeneous magnesium alloy with the grain size of 30 nm-2 microns, the tensile strength of the alloy is larger than or equal to 580 MPa, the yield strength is larger than or equal to 470 MPa, and the percentage elongation after fracture is larger 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 万迎春刘楚明郭学益高永浩
Owner CENT SOUTH UNIV
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