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.
出处
《热加工工艺》
CSCD
北大核心
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)
