A kind of mg-nd-mn ternary heat-resistant magnesium alloy and preparation method thereof

A magnesium alloy, mg-25% nd 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, achieve good industrial application value and less alloy main elements , strengthen the effect of realm and phase interface

Active Publication Date: 2022-08-09
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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  • A kind of mg-nd-mn ternary heat-resistant magnesium alloy and preparation method thereof
  • A kind of mg-nd-mn ternary heat-resistant magnesium alloy and preparation method thereof
  • A kind of mg-nd-mn ternary heat-resistant magnesium alloy and preparation method thereof

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Effect test

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, mix industrial pure magnesium ingot, Mg-25%Nd master alloy (by mass percentage, Nd25%, Mg remainder), Mg-10%Mn master alloy (by mass percentage, Mn10%, Mg remainder amount) preheated at 150°C for 1h;

[0036]In step 2, the preheated industrial pure magnesium ingot is melted in a protective atmosphere at a temperature of 760 ° C; The magnesium melt was kept for 20 minutes; after the Mg-25%Nd master alloy and the Mg-10%Mn master alloy were completely melted, mechanical stirring was performed for 2 minutes; then argon was introduced to promote the uniform mixing of the melt and achieve the effect of degassing the melt , stand for 10 minutes at this temperature to make the inclusions float or settle in the melt; finally, the melt is cooled to 710 ° C, the scum is skimmed, and the magnesium alloy ingot is obtained by pour...

Embodiment 1

[0044] In this embodiment, the Nd and Mn composite strengthened heat-resistant magnesium alloy contains the following components by mass percentage: Nd 1.0wt%, Mn 0.3wt%, the rest are Mg and inevitable 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 composite comprises the following steps:

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

[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 in sequence for 20min; wait for Mg-25%Nd After the master alloy and Mg-10%Mn master alloy are completely melted, mechanically stir for 2 minutes; then the temperature is lowered to 730°C and argon gas is intr...

Embodiment 2

[0052] In this embodiment, the Nd and Mn composite strengthened heat-resistant magnesium alloy contains the following components by mass percentage: Nd 2.0wt%, Mn 0.5wt%, the rest are Mg and inevitable 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 composite comprises the following steps:

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

[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 in sequence for 20min; wait for Mg-25%Nd After the master alloy and Mg-10%Mn master alloy are completely melted, mechanically stir for 2 minutes; then the temperature is lowered to 730°C and argon gas is intr...

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Abstract

The invention belongs to the field of non-ferrous metal materials and processing thereof, in particular to a Mg-Nd-Mn ternary heat-resistant magnesium alloy and a preparation method thereof. In the heat-resistant magnesium alloy, the mass percentage content of each component is: Nd 0.5-3.0 wt%, Mn 0-3.0 wt%, the rest are Mg and inevitable impurities, and the impurity content is less than or equal to 0.04 wt%. The heat-resistant magnesium alloy is prepared by a series of means such as melting, casting, solution treatment and low-temperature extrusion. In the present invention, a deformed magnesium alloy with submicron grain size is obtained by compounding Nd and Mn elements and combining with a low-temperature extrusion process. Dynamic precipitation of high-density Mg during extrusion 12 Nd nano-precipitate phase has high thermal stability and still plays a strengthening role at high temperature; and a large number of solute atoms segregate near grain boundaries and dislocations, which strongly inhibits the movement of grain boundaries and dislocations, further improving High temperature mechanical properties of alloys.

Description

Technical field: [0001] The invention belongs to the field of non-ferrous metal materials and processing thereof, in particular to a Mg-Nd-Mn ternary heat-resistant magnesium alloy and a preparation method thereof. Background technique: [0002] As the lightest metal structural materials, magnesium and its alloys are the third most potential metal structural materials after steel and aluminum alloys. has been widely used. Especially in the fields of transportation and aerospace, the popularization and application of magnesium and its alloys can significantly reduce the weight of parts, improve fuel efficiency and save energy, thereby alleviating the increasingly severe environmental and energy crisis in my country. [0003] However, the strength of magnesium alloys is relatively low, especially at high temperatures, the strength drops sharply, which severely limits its application in high temperature fields. The current research basically starts from restricting the moveme...

Claims

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Application Information

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Patent Type & AuthorityPatents(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