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作 者:王涛[1] 戴品强[1] 谢宇玲[1] 项忠楠[1]
出 处:《热加工工艺》2008年第2期9-12,共4页Hot Working Technology
基 金:福州大学科技发展基金资助项目(2004-XQ-02)
摘 要: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 influences of quenching temperature and cyclic tension on superelasticity and shape memory effect of Ti-16Nb-4Sn (at%) alloy were investigated by tensile test and bending test at room temperature. The results show that the as-forged alloy almost exhibits complete superelasticity after deformation at room temperature. The alloy quenched at 700 ℃ shows the best shape memory effect. The shape recovery ratio is up to 21.1% and has the lowest superelasticity when heated to 150 ℃ after deformation at room temperature. The superelasticity and shape memory effect are complementary. Cyclic tensile test can evidently improve the superelasticity of the alloy. Complete superelasticity of the as-forged alloy and the alloy quenched at 400℃ was obtained at the third circle tension under the strain of 4%. X-ray diffraction (XRD) experiment shows that the microstructure of the alloy is β+α"martensite at room temperature.
关 键 词:Ti-Nb-Sn合金 超弹性 形状记忆效应 马氏体相变 淬火
分 类 号:TG139.6[一般工业技术—材料科学与工程]
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