A heat-resistant magnesium alloy with stable high-temperature strength

Abstract

The invention discloses a heatproofing magnesium alloy with stable high-temperature strength. The heatproofing magnesium alloy comprises the following components by weight percent: 3%-5% of Y, 1%-2% of Gd, 0.5%-1.5% of Sm, 0.5%-1.5% of Nd, 0.5%-1% of Ca, and the balance of Mg and inevitable impurities. The heatproofing magnesium alloy has a prominent characteristic in heat-resistant quality, namely very stable high-temperature tensile strength, at 200 DEG C-300 DEG C, the tensile strength of the magnesium alloy reduces along with temperature rising in small amplitude about 10%, at room temperature, the tensile strength can reach 246MPa, at 300 DEG C, the tensile strength still can reach above 200MPa; compared with commercial heatproofing magnesium alloy WE54, the heatproofing magnesium alloy has lower cost and more stable high-temperature strength, and has wide application prospect in fields such as aerospace, automobile industry, weapons and the like.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloys, in particular to a heat-resistant magnesium alloy with stable high-temperature strength. 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 heat resistance and creep resistance of magnesium alloys seriously hinders its application in aerospace, military, automobile and other industries. Therefore, the high temperature strength and heat resistance of magnesium alloys are improved to improve their use under high temperature conditions. The reliability of magnesium alloy materials and the expansion of its application range in high temperature environment are important issues in the development of magnesium alloy materials. [0003] The existing h...

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Problems solved by technology

[0004] The current commercial heat-resistant rare earth magnesium alloys such as WE54 and the Mg-Gd alloys developed in recent years all contain relatively high rare earth elements Y, Nd, Gd, etc., and the total rare earth content in the alloy exceeds 8%, or even as high as 20%, which greatly increases the cost of the alloy, and its high temperature performance is limited, especially the heat resistance is not stable enough, and the strength drops more at high temperature.