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A heat-resistant and creep-resistant magnesium alloy and its preparation method

A creep-resistant, magnesium alloy technology, applied in the field of metal materials and metallurgy, can solve the problem that magnesium alloys are not very suitable, and achieve the effects of simple smelting and heat treatment process, uniform microstructure and simple preparation process

Active Publication Date: 2018-09-21
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The maximum tensile strength of the magnesium alloy at 200°C is 202MPa, and the yield strength is 136MPa, but the magnesium alloy still cannot meet the current application requirements for magnesium alloys at higher temperatures (200-300°C). And its creep only discloses the test results under the condition of 200°C and 80MPa, and the lowest creep value has reached 0.05%. For the creep test under higher temperature and stress conditions, this invention does not provide, generally speaking It can be said that the magnesium alloy is not very suitable for applications under high temperature conditions (200-300°C), and there are many limitations in the scope of use.

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  • A heat-resistant and creep-resistant magnesium alloy and its preparation method

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Embodiment 1

[0035] In this embodiment, the heat-resistant and creep-resistant magnesium alloy is composed of the following components in mass percentage: 7% Sm, 0.8% Nd, 1.8% Zn, 1.0% Ca, 1.5% Mn, 1.1% Al, and the balance is Mg and not Avoid impurities. The inevitable impurity elements are Si, Fe, Cu, Ni; the sum of the mass percentages of Si, Fe, Cu, Ni is less than 0.015%.

[0036] The preparation method of the heat-resistant and creep-resistant magnesium alloy in this embodiment comprises steps:

[0037] (1) Place the pure magnesium, pure aluminum, pure zinc and magnesium samarium master alloy, magnesium neodymium master alloy, magnesium calcium master alloy, magnesium manganese master alloy respectively in the dry box of 200 ℃ for separate preheating, preheat The heating time is 2 hours;

[0038] (2) in CO 2 with SF 6 In the mixed gas atmosphere, melt the magnesium, aluminum and zinc preheated in step (1), and when heated to 740 ° C, add the magnesium samarium master alloy, magnes...

Embodiment 2

[0042] In this embodiment, the heat-resistant and creep-resistant magnesium alloy is composed of the following components in mass percentage: 7.5% Sm, 0.7% Nd, 2.0% Zn, 1.3% Ca, 1.2% Mn, 1.3% Al, and the balance is Mg and not Avoid impurities. The inevitable impurity elements are Si, Fe, Cu, Ni; the sum of the mass percentages of Si, Fe, Cu, Ni is less than 0.015%.

[0043] The preparation method of the heat-resistant and creep-resistant magnesium alloy in this embodiment comprises steps:

[0044] (1) Place the pure magnesium, pure aluminum, pure zinc and magnesium samarium master alloy, magnesium neodymium master alloy, magnesium calcium master alloy, magnesium manganese master alloy respectively in the dry box of 210 ℃ for separate preheating, preheat The heating time is 2 hours;

[0045] (2) in CO 2 with SF 6 In a mixed gas atmosphere, melt the preheated magnesium, aluminum, and zinc in step (1), and when heated to 750°C, add the preheated magnesium samarium master allo...

Embodiment 3

[0049] In this embodiment, the heat-resistant and creep-resistant magnesium alloy is composed of the following components in mass percentage: 7.8% Sm, 0.9% Nd, 1.9% Zn, 1.2% Ca, 1.5% Mn, 1.3% Al, and the balance is Mg and not Avoid impurities. The inevitable impurity elements are Si, Fe, Cu, Ni; the sum of the mass percentages of Si, Fe, Cu, Ni is less than 0.015%.

[0050] The preparation method of the heat-resistant and creep-resistant magnesium alloy in this embodiment comprises steps:

[0051] (1) Place the pure magnesium, pure aluminum, pure zinc and magnesium samarium master alloy, magnesium neodymium master alloy, magnesium calcium master alloy, magnesium manganese master alloy respectively in the dry box of 210 ℃ for separate preheating, preheat The heating time is 2 hours;

[0052] (2) in CO 2 with SF 6 In the mixed gas atmosphere, melt the magnesium, aluminum and zinc preheated in step (1), and when heated to 740 ° C, add the magnesium samarium master alloy, magn...

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Abstract

The invention relates to a heat-resistant creep-resistant magnesium alloy and a preparing method thereof, which belong to the field of metal materials and metallurgy. The heat-resistant creep-resistant magnesium alloy is mainly formed by the following components in percent by mass: 7-8% of Sm, 0.7-0.9% of Nd, 1.5-2.0% of Zn, 1.0-1.3% of Ca, 1.2-1.5% of Mn, 1.1-1.3% of Al and the balance of Mg and inevitable impurities. The magnesium alloy in the invention has good tensile strength and better creep resistance under a high temperature, and has better application prospect.

Description

technical field [0001] The invention relates to a heat-resistant and creep-resistant magnesium alloy and a preparation method thereof, belonging to the field of metal materials and metallurgy. Background technique [0002] Magnesium and magnesium alloys are the lightest metal structural materials in engineering applications. They have significant advantages in many fields, especially in aviation, aerospace and automobiles, motorcycles, and high-speed light rail trains. However, The poor strength and heat resistance of magnesium alloys seriously hinders its application in aerospace, military, automobile and other industries. Therefore, improving the strength and heat resistance of magnesium alloys is an important issue for the development of magnesium alloy materials. [0003] The existing heat-resistant magnesium alloy development mainly starts with restricting dislocation movement and strengthening grain boundaries. By adding appropriate alloying elements, introducing a sec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22C1/03C22F1/06
CPCC22C1/03C22C23/06C22F1/06
Inventor 陈君陈晓亚张清朱利敏付三玲李全安张帅王颂博关海昆
Owner HENAN UNIV OF SCI & TECH
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