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The Mo 5Si 3 base alloys with a series of transition metal elements were prepared by arc melting, and were annealed at 1?250?℃ in vacuum for 24?h. 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 Mo 5Si 3, 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., Mo 5Si 3 matrix and the second phase Mo 37 Zr 20 Si 43 , Mo 66 Si 19 Ti 15 , MoCoSi or (Mo, V) 3Si.
The Mo 5Si 3 base alloys with a series of transition metal elements were prepared by arc melting, and were annealed at 1 ~ 250 ° C in vacuum for 24 h. Ternary alloying effect was investigated by X ray diffractometry (XRD) , the scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The EDS results show that Zr, Ti, Co and V have certain solubility in homogenized Mo 5Si 3, 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, ie, Mo 5Si 3 matrix and the second phase Mo 37 Zr 20 Si 43, Mo 66 Si 19 Ti 15, MoCoSi or (Mo, V) 3Si.