Ti-based bulk metallic glass matrix composites with in situ precipitated β-Ti phase fabricated by spark plasma sintering

Abstract Ti-based bulk metallic glass (BMG) matrix composites with in situ precipitated β-Ti phase were fabricated by spark plasma sintering of amorphous (Ti 66 Nb 13 Cu 8 Ni 6.8 Al 6.2 ) 1 B 0.79 C 0.65 alloy powder with a wide Δ T x of 102 K under a sintering pressure of 500 MPa. The wider Δ T x and the smaller particle size for the as-synthesized (Ti 66 Nb 13 Cu 8 Ni 6.8 Al 6.2 ) 1 B 0.79 C 0.65 amorphous powder is present compared to B- and C-free amorphous powder. At a sintering temperature of 743 K, spherical nanocrystalline β-Ti with a grain size of 5 nm was homogeneously precipitated in amorphous matrix. Meanwhile, the BMG matrix composite fabricated has a relative density of 98.1% and an amorphous phase volume fraction of 55.2%. However, the BMG matrix composites fabricated exhibit a brittle manner. The results obtained provide an alternative method for fabricating large-sized BMG matrix composites and parts by powder metallurgy.