Transactions of Nonferrous Metals Society of China
JOURNAL OF RAILWAY SCIENCE AND ENGINEERING
|Vol. 11 No. 5 October 2001|
Mo5Si3 with Zr, Ti, Co and V
（Department of Materials Science and Engineering,
Central South University, Changsha 410083, P.R.China）
Abstract: The Mo5Si3 base alloys with a series of transition metal elements were prepared by arc-melting, and were annealed at 1250℃ in vacuum for 24h. Ternary alloying effect was investigated by X-ray diffractometry (XRD), optical microscopy, scanning electron microscopy (SEM) and energy dispersive spectroscopy(EDS). The EDS results show that Zr, Ti, Co and V have certain solubility in homogenized Mo5Si3, which are determined to be 2.20±1.42,15.94±0.18,3.33±0.76 and 7.43±0.22 (mole fraction, %), respectively. Microstructural characteristics indicate that all studied alloys have a two-phase microstructure, i.e., Mo5Si3 matrix and the second phase Mo37Zr20Si43,Mo66Si19Ti15 ,MoCoSi or (Mo, V)3Si.
Key words: silicides; alloying effect; microstructure