Ternary alloying of Mo₅Si₃ with Zr, Ti, Co and V

À´Ô´ÆÚ¿¯£ºÖйúÓÐÉ«½ðÊôѧ±¨(Ó¢ÎÄ°æ)2001ÄêµÚ5ÆÚ

ÂÛÎÄ×÷Õߣº²ÜêÅ Ò×µ¤Çà ¬±ó ¶ÅÈôê¿ Êæ½ð²¨

ÎÄÕÂÒ³Â룺691 - 695

Key words£ºsilicides; alloying effect; microstructure

Abstract: The Mo₅Si₃ base alloys with a series of transition metal elements were prepared by arc-melting, and were annealed at 1250¡æ 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¡À1.42,15.94¡À0.18,3.33¡À0.76 and 7.43¡À0.22 (mole fraction, %), respectively. Microstructural characteristics indicate that all studied alloys have a two-phase microstructure, i.e.,Mo ₅Si₃ matrix and the second phase Mo₃₇Zr₂₀Si₄₃,Mo₆₆Si₁₉Ti₁₅ ,ªªMoCoSi or (Mo, V)₃Si.