Formation and mechanical properties of the particulate-reinforced Cu-Zr-based bulk metallic glass composites

摘要

In order to improve the ductility of BMGs, the composites with a glassy matrix and the second reinforced phases have been synthesized by precipitating a dendrite bcc phase [beta-Zr or Ta solution) from the melt or adding the foreign particles to the melt prior to casting. As compared with in situ dendrite composites, the composites containing the foreign particles possess such advantages as the simple synthesis process, adding more kinds of reinforced phases and easy control of the homogeneous distribution of the reinforced phases. However, the Zr_(57)Nb_5Al_(10)Cu_(15.4)Ni_(12.6) BMG composites containing the W, Ta or SiC particles was reported to exhibit only 2-7 percent plastic strain, far lower than that of the in situ dendrite composites. In this work, we report: a Ta particle-reinforced Cu_(36)Zr_(48)Al_8Ag_8 BMG composite, which exhibits high strength and unusual plastic strain of 31 percent.