Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1638060 | Transactions of Nonferrous Metals Society of China | 2012 | 7 Pages |
Abstract
Ageing hardening, microstructure and mechanical properties of Mg-xY-1.5LPC-0.4Zr (x=0, 2, 4, 6) alloys (LPC represents La-based rare earth metal) were investigated. It was found that the age hardening was enhanced, the grains became finer and the tensile strength was improved with the increase of Y content in Mg-Y-1.5LPC-0.4Zr alloy. The results show that the formed precipitates responsible for age hardening change from fine hexagonal-shaped equilibrium Mg12RE phase to metastable βⲠphase with orthorhombic-bc crystal structure when Y is added into Mg-1.5LPC-0.4Zr alloy, and the volume fraction of precipitate phases also increases. The cubic-shaped β-Mg24Y5 precipitate phases were also observed at grain boundaries in Mg-6Y-1.5LPC-0.4Zr alloy. The distribution of prismatic shaped βⲠphases and cubic shaped β-Mg24Y5 precipitate phases in Mg matrix may account for the remarkable enhancement of tensile strength of Mg-Y-LPC-Zr alloy. The Mg-6Y-1.5LPC-0.4Zr alloy exhibits maximum tensile strength at peak-aged hardness, and the values are 250 MPa at room temperature and 210 MPa at 250 °C.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Jun WANG, Jing-jiang NIE, Rong WANG, Yong-dong XU, Xiu-rong ZHU, Guo-ping LING,