SYNTHESIS OF PLASTIC LIGHTWEIGHT Ti-BASED METALLIC-GLASS-MATRIX COMPOSITES BY BRIDGMAN SOLIDIFICATION
Bridgman法制备塑性钛基轻质非晶复合材料

A series of lightweight Ti-based ductile in-situ dendrite-reinforced metallic-glass-matrix composites were synthesized by Bridgman solidification. Compared to Cu-mould suction casting, the $\beta$-Ti dendrites were uniformly distributed within the glass matrix by this method. Through tailoring the withdrawal velocity, the volume fraction and the characteristic spanning length of dendrites could be changed, which provides a way to optimize the mechanical properties of the composites. The Ti-based composite with excellent mechanical performances (high ultimate strength of 2706 MPa and large plasticity of 18.0% with apparent work-hardening behavior) was synthesized when the withdrawal velocity was fixed at 1.4 mm/s. The relationship between the size of the dendrites and the mechanical properties was investigated, and it was found that the improved mechanical properties were obtained when the size of the dendrited approached about 40 μm.