Abstract
Ti-based bulk metallic glass composite alloys Ti56Zr6Cu19.8Pd8.4Sn1.8Nb8, Ti64Zr4Cu13.2Pd5.6Sn1.2Nb12 and Ti68Cu13.2Pd5.6Sn1.2Nb12 were designed to obtain the microstructure composing of β-Ti dendrites and glassy matrix. The compressive and three-point bending properties were investigated. It was found that the actual microstructure of the Nb-added alloys consisted of primarily precipitated β-Ti dendrites, network-like glassy matrix, and extra island-like Ti2Cu intermetallic phase with different volume fractions. Under compressive loading, all the Nb-added alloys presented higher yield strength combined with remarkably increased plasticity. Under bending condition, however, the alloys Ti56Zr6Cu19.8Pd8.4Sn1.8Nb8 and Ti64Zr4Cu13.2Pd5.6Sn1.2Nb12 with higher Ti2Cu volume fractions became completely brittle. The alloy Ti68Cu13.2Pd5.6Sn1.2Nb12 could keep its plastic deformability due to the decreased Ti2Cu volume fraction. Compressive deforming behavior of the Nb-added alloys was determined by the ductile β-Ti phase and glassy matrix, nevertheless, bending deforming behavior of the alloys was determined by the volume fraction and distribution of the brittle intermetallics.
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