Microstructure and Mechanical Properties of Mg-10Gd-4.8Y-0.6Zr High Strength Magnesium Alloy

Wang Songtao; Liu Honghui; Dong Ruihua; Song Xingwu; Jiang Yanliang

doi:10.15980/j.tzzz.2014.02.016

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Microstructure and Mechanical Properties of Mg-10Gd-4.8Y-0.6Zr High Strength Magnesium Alloy
Vol. 34, Issue 2, Pages: 128-132(2014)
Published： 2014 ，
DOI： 10.15980/j.tzzz.2014.02.016

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[1]王松涛,刘洪汇,董瑞华,宋兴武,姜延亮.Mg-10Gd-4.8Y-0.6Zr合金的微观组织及力学性能[J].特种铸造及有色合金,2014,34(02):128-132.

Wang Songtao, Liu Honghui, Dong Ruihua, et al. Microstructure and Mechanical Properties of Mg-10Gd-4.8Y-0.6Zr High Strength Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 34(2):128-132(2014)
[1]王松涛,刘洪汇,董瑞华,宋兴武,姜延亮.Mg-10Gd-4.8Y-0.6Zr合金的微观组织及力学性能[J].特种铸造及有色合金,2014,34(02):128-132. DOI： 10.15980/j.tzzz.2014.02.016.

Wang Songtao, Liu Honghui, Dong Ruihua, et al. Microstructure and Mechanical Properties of Mg-10Gd-4.8Y-0.6Zr High Strength Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 34(2):128-132(2014) DOI： 10.15980/j.tzzz.2014.02.016.

摘要

采用半连续铸造方法制备出成分为Mg-10Gd-4.8Y-0.6Zr（质量分数）的镁合金铸锭

经均匀化处理后进行挤压

随后进行人工时效处理。室温拉伸试验显示

合金的抗拉强度最大达460MPa

屈服强度最大达410 MPa

伸长率为5%。光学显微镜（OM）、扫描电镜（SEM）和高分辨率透射电镜（HRTEM）的观察结果表明

经过挤压后的Mg-10Gd-4.8Y-0.6Zr镁合金

晶粒由均匀化后的60μm细化到20μm以下

且随挤压比的增大晶粒细化效果更加明显。峰值时效态的合金中存在大量与基体共格析出的β′相

这些在时效过程中析出的共格弥散相对位错运动有明显的阻碍作用。以上两点是合金强度提升的主要原因。

Abstract

Large-size Mg-10Gd-4.8Y-0.6Zr ingots were produced by semi-continuous casting

and it was extruded after homogenization treatment

and then treated by artificial aging.The tested results reveal that peak aged Mg alloy exhibits a maximum tensile strength of 460 MPa

maximum yield strength of410MPa with an elongation of 5%.The alloy was observed with the help of optical microscope

scanning electron microscopy（SEM）and high resolution electron diffraction（HRTEM）.The results show that the grain size of the extruded alloy is decreased from 60μm for homogenization treatment to below20μm

and refining effects are improved increasingly with increasing in squeezing ratio.Amounts of β′ phase can be observed in the peak aged alloy

which obviously restrains the dislocation movement

greatly improving the strength of the alloy.