Influence of solution heat treatment on the microstructural evolution and mechanical behavior of 60NiTi
Journal of Alloys and Compounds(2019)
摘要
The microstructures and mechanical properties of 60NiTi alloys after solution treated at 980 °C, 1005 °C, 1030 °C and 1055 °C for 2 h, 4 h, 8 h were studied. The results showed that there was undissolved Ni3Ti phase in the specimens after heat treated at 980 °C and 1005 °C for 8 h, and the specimens consisted of Ni3Ti, B2 NiTi and Ni4Ti3 phase. The volume fraction of the Ni4Ti3 phase was about 36% and 46% respectively. After heated at 1030 °C and 1055 °C for 8 h, specimens consisted of B2 NiTi and Ni4Ti3 phase, and the Ni3Ti phase was totally dissolved into the matrix. As a result, the volume fraction of Ni4Ti3 phase increased to 69% and 64%. Higher density of the Ni4Ti3 phase contributed to the higher hardness and higher ultimate compressive strength. The fracture modes of samples after solution treated were mainly quasi-cleavage fracture. The undissolved Ni3Ti phase improved the fracture toughness of the binary alloy. Crack propagation path in Ni3Ti rich area was featured by a zigzag mode, which indicated that Ni3Ti phase displayed positive effect on fracture toughness. The toughening mechanism of 60NiTi with Ni3Ti phase is emphasized.
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关键词
Ni-rich Ni-Ti,Heat treatment,Ni3Ti,Mechanical property,Fracture behavior
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