Effect of heat treatment on fatigue behaviour of biomedical Ni–Ti alloy wires under ultrasonic conditions
作者： H M Zhou , H X Wang , C H Zhao , J R Li , Q F Li
DOI: 10.1179/175355511X13240279339761
关键词:
摘要: Superelastic Ti–50·8 at.%Ni alloy wires were tested under ultrasonic conditions using a self-designed fatigue tester. Different heat treatment processes carried out to Ni–Ti wires, and the mechanical properties of investigated. Experimental results indicated that longest life wire was obtained when it annealed after cold drawing. Proper thermomechanical increased due adjustment microstructure in alloys as well workhardening effect. The strengthening effect drawing attributed fine Ti3Ni4 precipitated phase high density dislocations respectively. SEM showed smooth fractured faces with dimples existed propagation region cracks, indicating excellent ductility better resistance cracks NiTi wires.
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