Effects of Microalloying on Microstructure and Mechanical Properties of Magnesium Alloy

Ma Yutao; Zhang Xingguo; Gong Ningning; Qiu Yue; Jin Junze

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Effects of Microalloying on Microstructure and Mechanical Properties of Magnesium Alloy
Issue 10, Pages: 739-742(2008)
Published： 2008 ，
DOI：

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[1]马玉涛,张兴国,宫宁宁,丘越,金俊泽.微合金化对AZ31组织和力学性能的影响[J].特种铸造及有色合金,2008(10):739-742+733.

Ma Yutao, Zhang Xingguo, Gong Ningning, et al. Effects of Microalloying on Microstructure and Mechanical Properties of Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys (10):739-742(2008)
[1]马玉涛,张兴国,宫宁宁,丘越,金俊泽.微合金化对AZ31组织和力学性能的影响[J].特种铸造及有色合金,2008(10):739-742+733. DOI：

Ma Yutao, Zhang Xingguo, Gong Ningning, et al. Effects of Microalloying on Microstructure and Mechanical Properties of Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys (10):739-742(2008) DOI：

摘要

研究了Ca和Zr元素对AZ31镁合金铸态显微组织和力学性能的影响

并探讨其化学成分与组织结构和力学性能之间的变化。结果表明

在AZ31镁合金中加入Ca后

合金的组织明显细化

晶间析出相增多

β-Mg17Al12相数量减少

当Ca含量为0.37%时

在晶界上出现了新相Al2Ca相

Al2Ca相对合金有强化作用

合金的抗拉强度为190.4MPa。当Ca含量达到1.54%时

晶粒尺寸最小为63.4μm;采用电磁-悬浮铸造技术

在AZ31镁合金中加入Zr

可以细化合金的显微组织

提高其力学性能

当Zr含量达到0.07%时

合金的抗拉强度为210.8MPa

与铸态AZ31镁合金相比提高了19.56%

伸长率为12.9%

提高了20.56%。

Abstract

Effects of Ca and Zr addition on as-cast microstructure and mechanical properties of AZ31 magnesium alloy were investigated. The results indicate that the microstructure of AZ31 magnesium alloy can be refined with Ca addition

in which the precipitates at inter-crystal are increased and β-Mg17Al12 phases are decreased. In addition

the Al2Ca phase is created at grain boundary with 0.37% Ca addition

which can improve the tensile strength of alloy to maximum value of 190.3 MPa as a result of enhancing alloy. The minimum size of 63.4 μm can be obtained in the AZ31 alloy with 1.5% Ca addition. Zr addition can refine the microstructure and improve the mechanical properties of AZ31 magnesium alloy in electromagnetic-suspending casting. Compared with those of as-cast AZ31 magnesium alloy

the tensile strength and elongation of the alloy with 0.07% Zr addition are 210.75 MPa and 12.9%

respectively

increased by 19.56% and by 20.56%

respectively.