Ti-14Nb-4Sn形状记忆合金的性能研究

Study on performance of Ti-14Nb-4Sn shape memory alloys

为了验证Ti-14Nb-4Sn(at%)合金用于制备压力管道管接头的可行性,研究了该合金的超弹性和形状记忆效应。针对淬火温度对形状记忆合金性能具有重要影响的特点,采用了不同的淬火工艺对合金进行热处理,由弯曲试验确定了合金获得良好性能的淬火温度。通过拉伸试验对合金的超弹性进行了进一步研究与分析,发现了400℃淬火合金具有接近完全的超弹性,得到了循环拉伸可以明显改善合金超弹性的结论。研究结果表明,经过特定温度淬火后的Ti-14Nb-4Sn合金具有良好的超弹性和形状记忆效应,可作为压力管道管接头的优良选材。

In order to verify that Ti-14Nb-4Sn （at%）alloy can be used to prepare the pressure pipe fittings,the superelasticity and shape memory effect of the alloy were investigated. Aiming that quenching temperature has a significant impact on shape memory alloys, the alloys were quenched at different temperatures. The quenching temperatures which the good performance alloys require were confirmed through bending tests. The almost complete superelasticity of the alloy quenched at 400 ℃ was received through tensile tests. The superelasticity of the alloy was significantly improved by cyclic tension. The experimental results indicate that the Ti-14Nb-4Sn alloy quenched at specific temperature exhibits good superelasticity and shape memory effect, and it is one of best materials for making pressure pipe fittings.