Mg-Nd-Mn ternary heat-resistant magnesium alloy and preparation method thereof

A magnesium alloy, heat-resistant technology, applied in the field of Mg-Nd-Mn ternary heat-resistant magnesium alloy and its preparation, can solve the problems of strength reduction and high cost, and achieve good industrial application value, excellent performance, and uniform alloy composition. Effect

Active Publication Date: 2021-12-07
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current commercial heat-resistant magnesium alloys such as WE54 are difficult to be widely used in military, aerospace, transportation and other fields due to their rapid strength decline and high cost at high temperatures.

Method used

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  • Mg-Nd-Mn ternary heat-resistant magnesium alloy and preparation method thereof
  • Mg-Nd-Mn ternary heat-resistant magnesium alloy and preparation method thereof
  • Mg-Nd-Mn ternary heat-resistant magnesium alloy and preparation method thereof

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preparation example Construction

[0034] The preparation method of the above-mentioned Nd, Mn composite strengthened heat-resistant magnesium alloy comprises the following steps:

[0035] Step 1, industrially pure magnesium ingot, Mg-25% Nd master alloy (by mass percentage, Nd25%, Mg remainder), Mg-10%Mn master alloy (by mass percentage, Mn10%, Mg surplus amount) Preheat at 150°C for 1h;

[0036]Step 2, melting the preheated industrial pure magnesium ingot in a protective atmosphere at a temperature of 760° C.; putting the preheated Mg-25% Nd master alloy and Mg-10% Mn master alloy into completely melted pure magnesium ingots successively. Keep warm in the magnesium melt for 20 minutes; after the Mg-25% Nd master alloy and Mg-10% Mn master alloy are completely melted, stir mechanically for 2 minutes; then pass in argon to promote the uniform mixing of the melt and achieve the effect of degassing the melt , stand at this temperature for 10 minutes to make the inclusions in the melt float or settle; finally, co...

Embodiment 1

[0044] In this embodiment, the heat-resistant magnesium alloy strengthened by Nd and Mn includes the following components in mass percentage: Nd 1.0wt%, Mn 0.3wt%, the rest is Mg and unavoidable impurities, and the impurity content is ≤ 0.04wt%.

[0045] In the present embodiment, the preparation method of the heat-resistant magnesium alloy strengthened by Nd and Mn comprises the following steps:

[0046] 1) Preheat the industrial pure magnesium ingot, Mg-25% Nd master alloy, and Mg-10% Mn master alloy at 150°C for 1 hour;

[0047] 2) Put the preheated industrial pure magnesium ingot in SF 6 / CO 2 Melt in a protective atmosphere at a temperature of 760°C; put the preheated Mg-25%Nd master alloy and Mg-10%Mn master alloy into the completely melted pure magnesium melt for 20 minutes; wait for the Mg-25%Nd After the master alloy and the Mg-10%Mn master alloy are completely melted, stir mechanically for 2 minutes; then lower the temperature to 730°C and feed argon to promote the...

Embodiment 2

[0052] In this embodiment, the heat-resistant magnesium alloy strengthened by Nd and Mn includes the following components in mass percentage: Nd 2.0wt%, Mn 0.5wt%, the rest is Mg and unavoidable impurities, and the impurity content is ≤ 0.04wt%.

[0053] In the present embodiment, the preparation method of the heat-resistant magnesium alloy strengthened by Nd and Mn comprises the following steps:

[0054] 1) Preheat the industrial pure magnesium ingot, Mg-25% Nd master alloy, and Mg-10% Mn master alloy at 150°C for 1 hour;

[0055] 2) Put the preheated industrial pure magnesium ingot in SF 6 / CO 2 Melt in a protective atmosphere at a temperature of 760°C; put the preheated Mg-25%Nd master alloy and Mg-10%Mn master alloy into the completely melted pure magnesium melt for 20 minutes; wait for the Mg-25%Nd After the master alloy and the Mg-10%Mn master alloy are completely melted, stir mechanically for 2 minutes; then lower the temperature to 730°C and feed argon to promote the...

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Abstract

The invention belongs to the field of nonferrous metal materials and processing thereof, and particularly relates to an Mg-Nd-Mn ternary heat-resistant magnesium alloy and a preparation method thereof. The heat-resistant magnesium alloy comprises the following ingredients in percentage by mass: 0.5 to 3.0 weight percent of Nd, 0 to 3.0 weight percent of Mn and the balance of Mg and inevitable impurities, and the content of the impurities is less than or equal to 0.04 weight percent. The heat-resistant magnesium alloy is prepared through a series of means such as melting, casting, solution treatment and low-temperature extrusion.The wrought magnesium alloy with submicron grain sizes is obtained by compositely adding Nd and Mn elements and combining a low-temperature extrusion process. In the extrusion process, a high-density Mg12Nd nano precipitated phase is dynamically precipitated, and the phase is relatively high in thermal stability and still plays a role in strengthening at high temperature; and a great number of solute atoms are segregated near the grain boundary and the dislocation, so that the movement of the grain boundary and the dislocation is strongly inhibited, and the high-temperature mechanical property of the alloy is further improved.

Description

Technical field: [0001] The invention belongs to the field of nonferrous metal materials and their processing, and in particular relates to a Mg-Nd-Mn ternary heat-resistant magnesium alloy and a preparation method thereof. Background technique: [0002] As the lightest metal structural material, magnesium and its alloys are the third largest metal structural materials with more potential after steel and aluminum alloys. They are known as "green engineering metals in the 21st century" and are used in key equipment and major projects in my country. has been widely used. Especially in the fields of transportation and aerospace, the promotion and application of magnesium and its alloys can significantly reduce the weight of parts, improve fuel efficiency and save energy, thus alleviating the increasingly severe environmental and energy crises in my country. [0003] However, the low strength of magnesium alloys, especially the sharp drop in strength at high temperature, severel...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C22C23/06C22C1/03C22F1/06
CPCC22C23/06C22C1/03C22F1/06C22F1/002
Inventor黄秋燕刘洋罗天骄李应举冯小辉杨院生
OwnerINST OF METAL RESEARCH - CHINESE ACAD OF SCI