Synthesis of Ni-based Bulk Metallic Glass Composites by Spark Plasma Sintering

摘要

Ni_(59)Zr_(15)Ti_(13)Si_3Sn_2Nb_7Al_1 bulk metallic glass matrix composites were fabricated by spark plasma sintering of a mixture of gas atomized metallic glass powders and ductile brass powders. The brass phases are homogeneously distributed in the metallic glass matrix and no pores are visible. The crystallization behavior of the composites was the same as that of the metallic glass powders. The composite shows macroscopic plasticity after yielding, and the plastic strain increased to around 2% with increasing brass content up to 30 vol%. Enhanced plasticity might be due to the multiple shear bands formed at the brass/matrix interfaces as well as the homogeneous distribution of brass phases, which hinders the propagation of shear bands. The composite with enhanced plasticity was successfully achieved by introducing a ductile phase in the bulk metallic glass.