Effect of prestrain on tensile property of TiNif/Mg composite

A TiNi shape memory alloy fibre-reinforced AZ31 Mg alloy matrix composite was fabricated herein by spark plasma sintering. The microstructure of the composite and the effect of prestrain on its strength were analysed. The phase transformation of TiNi was observed in situ, and the effect of temperature was monitored. Metallurgical bonding formed at the interface between the TiNi fibre and AZ31 matrix. The prestrain strengthening effect on the yield stress of the composite at 298 K was more dramatic than at 373 K, and the effect decreased with increasing prestrain. The prestrain strengthening effect on tensile strength of the composite was effective at both 298 and 373 K. Because of the difference between recovery stress of TiNi and prestrain-induced compressive stress, higher temperature strengthened the material more significantly than did prestrain application.