中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 23 No. 1 January 2013 |
（College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China）
Abstract:The microstructure evolution of the Mg-5Zn-0.63Er (mass fraction, %) alloy containing quasicrystalline phase (I-phase) under the as-cast condition was investigated via different heat treatments. The results show that apart from the precipitation of the W-phase particles, the I-phase almost dissolves into the matrix after solid solution treatment at 480 °C for 10 h (T4 state). The solution-treated alloy was aged at 175 °C for 6-100 h (T6 state). The ultimate tensile strength of the peak-aged alloy is approximately 261 MPa companying with an elongation of 10.5%. The improvement of the tensile strength is mainly attributed to the presence of the rod-like MgZn2 particles.
Key words: Mg-5Zn-0.63Er alloy; rare earth; Er; heat treatment; microstructure; mechanical properties
