Multicomponent heat-resistant magnesium alloy taking Sn and Gd as main components and preparation method thereof

Abstract

The invention provides a heat-resistant magnesium alloy taking Sn and Gd as main components. The alloy comprises the following components in percentage by mass: 3.0 to 5.0 percent of Sn, 1.2 to 3.0 percent of Gd, 0.2 to 0.4 percent of Mn, 0.3 to 0.5 percent of Ca, 0.10 to 0.16 percent of Sr, less than or equal to 0.02 percent of Si, less than or equal to 0.005 percent of Fe, less than or equal to 0.015 percent of Cu, less than or equal to 0.002 percent of Ni and the balance of Mg, wherein a weight ratio of Gd to Sn is 0.4-0.6:1; Si, Fe, Cu and Ni are impurity elements; and Mg is a balance element. The invention also provides a preparation method of the alloy. The alloy has high mechanical property and creep resistance.

Description

technical field [0001] The invention belongs to the field of heat-resistant magnesium alloy materials, and relates to a light metal material, in particular to a multi-element heat-resistant magnesium alloy with Sn and Gd as main components and a preparation method thereof. Background technique [0002] Magnesium alloy, as the lightest commercial metal engineering structural material, is known as the 21st century’s innovation due to its light specific gravity, high specific strength and specific stiffness, strong damping and vibration reduction, excellent liquid forming performance, and easy recycling. "Green Structural Materials". However, at present, due to the poor high-temperature creep resistance of existing magnesium alloys, the long-term working temperature cannot exceed 120°C, making it impossible to manufacture automotive transmission parts that require high high-temperature creep performance, thus greatly hindering the further development of magnesium alloys. appli...

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Problems solved by technology

However, at present, research on Mg-Sn-Gd series magnesium alloys at home and abroad mainly focuses on the structure of Mg-Sn-Gd ternary alloys [Niu Gao, Chen Yungui, Tang Yongbai, Xiao Sufen, Zhang Xiaoping, Wei Shanghai, Zhao Yuanhua. Mg- The as-cast microstructure of 5Sn-xGd alloy [J]. Special Casting and Nonferrous Alloys, 2008, 28(2): 150-152], but the research on its properties has basically not involved

In addition, since the GdMgSn phase formed in the Mg-Sn-Gd ternary magnesium alloy is generally relatively coarse, the coarse GdMgSn phase may become a source of cracks and lead to a decrease in the mechanical properties of the alloy.

It is precisely because of the above reasons that there are no reports on the successful development and application of Mg-Sn-Gd magnesium alloys at home and abroad.

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