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Magnesium alloy with high bulging and high heat resistance and preparation method thereof

A magnesium alloy, high heat-resistant technology, applied in the field of non-ferrous metal materials and processing, can solve the problems of Schmid factor reduction, contradictory effects of service performance, unfavorable room temperature bulging, etc., to improve room temperature bulging and medium-high temperature resistance Combination of heat, low cost, excellent plasticity and strength

Active Publication Date: 2022-02-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its poor bulging ability at room temperature and its tendency to creep failure in service at medium and high temperatures have always limited its further promotion and application.
However, strong basal texture will lead to a significant decrease in the Schmid factor of basal slip, impairing the bulging properties
Moreover, the grain boundary slip of coarse grains is difficult, which is generally beneficial to heat resistance, but not conducive to room temperature bulging. It can be seen that the contradictory effects of fine grains and coarse grains on service performance are also one of the bottlenecks in the development of magnesium alloys.

Method used

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  • Magnesium alloy with high bulging and high heat resistance and preparation method thereof
  • Magnesium alloy with high bulging and high heat resistance and preparation method thereof
  • Magnesium alloy with high bulging and high heat resistance and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A magnesium alloy with high bulging property and high heat resistance of the present invention contains 0.8% Y, 0.2% Ca, 0.5% Mn and 0.1% In by mass %, and the balance is Mg.

[0034] The high bulging high heat resistance magnesium alloy of the present embodiment, the Schmid factor ratio of its cylinder slip and basal slip is 1.19, the Schmid factor ratio of conical slip and basal slip is 1.22, this alloy With mixed grain sizes, the volume fraction of grains with a grain size ≤ 15 μm is 60%.

[0035] A preparation method of the high bulging high heat resistance magnesium alloy of the present embodiment, comprising:

[0036] S1. After the alloy is homogenized, thermal deformation is performed for 3 passes at 500°C, the cumulative true strain is 0.7, and the deformation direction of all passes is the same;

[0037] S2. The magnesium alloy is thermally deformed at 520° C. for one pass, the cumulative true strain is 0.8, and the thermal deformation direction is perpendicul...

Embodiment 2

[0052] A magnesium alloy with high bulging property and high heat resistance of the present invention contains 2.0% Gd, 0.2% Zr and 0.5% Zn by mass %, and the balance is Mg.

[0053] The high bulging high heat resistance magnesium alloy of the present embodiment, the Schmid factor ratio of its cylindrical surface slip and basal surface slip is 1.27, the Schmid factor ratio of conical surface slip and basal surface slip is 1.36, this alloy With mixed grain sizes, the volume fraction of grains with a grain size ≤ 15 μm is 50%.

[0054] A preparation method of the high bulging high heat resistance magnesium alloy of the present embodiment, comprising:

[0055] S1. After the homogenization treatment of the alloy, two passes of thermal deformation at 400°C are carried out, the cumulative true strain is 0.3, and the deformation direction of all passes is the same;

[0056] S2. Thermally deforming the magnesium alloy for one pass at 450° C., the accumulated true strain is 0.4, and t...

Embodiment 3

[0060] A magnesium alloy with high bulging property and high heat resistance of the present invention contains 2.0% of Gd and 0.5% of Zn by mass %, and the balance is Mg.

[0061] A method for preparing a highly bulging and high heat-resistant magnesium alloy of this embodiment differs from that of Embodiment 2 only in that the raw material composition is Mg-2.0Gd-0.5Zn.

[0062] The obtained Mg-2.0Gd-0.5Zn alloy is marked as sample No. 5, the ratio of the Schmid factor of cylindrical slip (0.428) to the Schmid factor of basal slip (0.315) is 1.36, and the Schmid factor of conical slip (0.482) The ratio to the basal slip Schmid factor (0.315) is 1.53, and the alloy has mixed grain sizes, and the volume fraction of grains with a grain size ≤ 15 μm is 45%.

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Abstract

The invention discloses a magnesium alloy with high bulging property and high heat resistance. The magnesium alloy contains 0.5% to 2.0% of element X in terms of mass percentage, and the element X is one or more of rare earth elements and calcium elements. species; and the ratio of the Schmid factor of at least one of the non-basal slip and the Schmid factor of the basal slip in the cylindrical slip and the conical slip of the magnesium alloy is 1.0-1.4. A preparation method of the magnesium alloy is also disclosed. The composition of the magnesium alloy of the present invention is simple, and belongs to the category of low alloying. The Schmid factor ratio of the non-basal slip and the basal slip is 1.0 to 1.4, which effectively balances the relative activities of the non-basal slip and the basal slip. , which can not only meet the requirements of high bulging, but also avoid the damage of base surface slipping to heat resistance. The preparation method of the invention has reasonable process design, simple equipment requirements, convenient operation, low cost and high efficiency, and can stably prepare a magnesium alloy with high bulging property and high heat resistance.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal materials and processing, and relates to a magnesium alloy with high bulging property and high heat resistance and a preparation method thereof, in particular to a Schmid factor ratio of non-basal surface slip and basal surface slip of 1.0 to 1.0. 1.4. Magnesium alloy with high bulging and high heat resistance and its preparation method. Background technique [0002] With the increasingly severe energy and environmental issues, the lightweight of structural materials has been paid more and more attention. As the lightest metal structural material at present, magnesium alloy has many advantages such as high specific strength, good shock absorption performance, and easy recycling, which has attracted the attention of many high-tech industries. However, its poor bulging ability at room temperature and its tendency to creep failure in service at medium and high temperatures have always limi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22F1/06
CPCC22C23/06C22F1/06
Inventor 霍庆欢胡思佳
Owner CENT SOUTH UNIV
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