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Preparation method of ultrahigh-strength low-rare-earth nano isometric 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, achieve the effect of increasing the total deformation of swaging, reducing the size of defects, and reducing the number

Inactive Publication Date: 2018-11-06
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 needs of aerospace and other fields for high-performance materials. Therefore, improving the strength of magnesium alloys and preparing high-strength or even ultra-high-strength magnesium alloys are important goals in the field of magnesium alloy research.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] a. The atomic percentage composition of the magnesium alloy is: Mg-1.36Gd-1.03Y-0.13Zr, 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 100°C, the deformation of each pass is controlled at 15%, 15%, 10%, the total deformation is 35%, and the feed rate is controlled at 3mm / 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 atomic percentage composition of the magnesium alloy is: Mg-1.36Gd-1.03Y-0.13Zr, 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 swaging deformation at 100°C, the deformation of each pass is controlled at 15%, 10%, 10%, the total deformation is 31%, and the feeding speed is controlled at 3mm / 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 atomic percentage composition of the magnesium alloy is: Mg-1.36Gd-1.03Y-0.13Zr, 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 rotary forging 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 2mm / 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 ultrahigh-strength low-rare-earth nano isometric magnesium alloy. The magnesium alloy comprises the components including, by atomic percentages, Mg, 0.91-1.36% of Gd, 0.87-1.29% of Y and 0.06-0.14% of Zr; a magnesium alloy semi-continuous casting ingot blank is subjected to homogenization treatment and then extruded into a bar, the extruded bar is subjected to rotary swaging deformation, the rotary swaging temperature is controlled to be 50-200 DEG C, the pass deformation is controlled to be 10-20%, the total deformation is 5-50%, the feeding speed is controlled to be 2-4 mm / min, the feeding direction is changed after every two passes of deformation, and then the nano isometric magnesium alloy with the diameter being 3-30 mm, the length being 1000-2000 mm and the grain size being 30 nm-2 mum is prepared; and subsequent heat treatment is performed, the alloy room temperature tensile strength is greater than or equal to 560 MPa, the yieldstrength is greater than or equal to 480 MPa, and the percentage elongation 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 in the field of magnesium alloy research. Nano-heterogeneous metal materials are an effective strengthening method for m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22F1/06B22D11/00
CPCB22D11/001C22C23/06C22F1/06
Inventor 万迎春刘楚明郭学益余世伦
Owner CENT SOUTH UNIV
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