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通过室温下拉伸及弯曲试验,研究了淬火温度以及循环拉伸对Ti-16Nb-4Sn(at%)合金的超弹性和形状记忆效应的影响。发现锻造态合金在室温变形后具有接近完全的超弹性。700℃冰水淬火的合金具有最好的形状记忆效应,室温变形后在150℃加热,形状回复率可达21.1%,但超弹性却最低。超弹性和形状记忆效应具有互补性。循环拉伸可以明显改善合金的超弹性。对于锻造态和经400℃冰水淬火的合金,通过4%应变量循环拉伸3次后均可获得完全的超弹性。XRD分析结果表明,室温下合金的组织为β+α″马氏体。
The effects of quenching temperature and cyclic stretching on the superelasticity and shape memory effect of Ti-16Nb-4Sn (at%) alloys were investigated by tensile and flexural tests at room temperature. The forged alloy was found to have near-perfect hyperelasticity after deformation at room temperature. 700 ° C iced water quenched alloy has the best shape memory effect. After deformation at room temperature and heating at 150 ℃, the shape recovery rate can reach 21.1%, but the superelasticity is the lowest. Superelasticity and shape memory effect are complementary. Cyclic stretching can significantly improve the superelastic alloy. For the as-cast and quenched alloys at 400 ° C, complete superelasticity was achieved after 3 cycles of stretching at 4% strain. XRD results show that the microstructure of the alloy is β + α "martensite at room temperature.