Mg-5Gd-4Y-0.3Zr合金组织和力学性能研究  

Microstructure and Mechanical Properties of Mg-5Gd-4Y-0.3Zr

作　　者：符韵[1] 沈蕾芳[1] 项运良[1] 夏祥生[1] 赵志翔[1] 宁海青[1] 

机构地区：[1]西南技术工程研究所,重庆400039

出　　处：《精密成形工程》2015年第5期130-134,共5页Journal of Netshape Forming Engineering

摘　　要：目的研究均匀化、挤压及时效热处理对Mg-5Gd-4Y-0.3Zr合金组织和力学性能的影响。方法制备了Mg-5Gd-4Y-0.3Zr合金铸棒,并进行了均匀化处理和热挤压处理。对不同状态的试样进行了拉伸试验,观察了金相显微组织,采用X射线衍射方法进行了结构分析。结果铸态合金组织主要由α-Mg基体和第二相Mg5(Gd,Y)组成;经过均匀化处理后,合金的第二相发生了完全回溶,合金的力学性能得到了提升;合金经挤压后,组织得到了明显细化,在200℃保温60 h得到了强度的最大值,抗拉强度、屈服强度和伸长率分别为423.0 MPa,335.0 MPa与9.0%。结论Mg-5Gd-4Y-0.3Zr合金既保证了低成本,又具有优良的力学性能,适合推广应用。ABSTRACT:The aim of this work was to investigate the effects of homogenization, extrusion and aging treatment on the microstructure and mechanical properties of Mg-5Gd-4Y-0. 3Zr alloy. Mg-5Gd-4Y-0. 3Zr alloy casting rod was prepared, then homogenization treatment and hot extrusion treatment were carried out. Tensile tests were conducted on the samples with different states. The metallographic microstructure was observed, and XRD was used to analyze the structure. The re-sults showed that the as-cast alloy mainly consisted of a-Mg matrix and the second phase Mg5( Gd, Y) . The second phase of the alloy dissolved completely after the homogenization treatment, and the mechanical property of the alloy was in-creased. The alloy structure was obviously refined after extrusion. The highest mechanical property was obtained after aging treatment at 200 ℃ for 60 h, and the ultimate tensile strength, yield strength and elongation were 423. 0 MPa, 335. 0 MPa, and 9. 0%, respectively. In conclusion, Mg-5Gd-4Y-0. 3Zr alloy not only has low cost feature, but also has excel-lent mechanical property. It is suitable for popularization and application.

关 键 词：Mg-5Gd-4Y-0.3Zr合金 热挤压 显微组织 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]