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采用钛合金d电子理论设计超弹性钛合金。采用水冷铜坩埚电弧熔炼的方法制备铸锭,经均匀化、冷轧和退火处理后,使用XRD和TEM分析退火后合金相组成,使用U型法测试超弹性。结果表明,Ti-24Nb-4Zr合金经800℃退火后具有优良的超弹性,U型法测试加载3.76%应变在卸载后可以完全回复。Sn具有强烈降低Ms点的作用,使得Ti-24Nb-2Zr-2Sn合金获得稳定的室温β相。300℃退火生成的ω相能够避免塑性变形过早发生,提高Ti-24Nb-2Zr合金的超弹性。但其同样阻碍β相的应力诱发马氏体转变,使得Ti-24Nb-4Zr合金经300℃退火获得的超弹性低于800℃退火获得的结果。
Design of superelastic titanium alloy with titanium d electronic theory. The ingot was prepared by arc melting with water-cooled copper crucible. After homogenization, cold rolling and annealing treatment, the composition of the alloy after annealing was analyzed by XRD and TEM, and the superelasticity was tested by U-shaped method. The results show that Ti-24Nb-4Zr alloy annealed at 800 ℃ has excellent superelasticity. The U-shaped test loaded with 3.76% strain can completely recover after unloading. Sn has the effect of strongly reducing the Ms point so that a stable room temperature β-phase is obtained for the Ti-24Nb-2Zr-2Sn alloy. The ω phase annealed at 300 ℃ can prevent premature plastic deformation and improve the super elasticity of Ti-24Nb-2Zr alloy. However, it also hinders the stress-induced martensitic transformation of the β-phase, resulting in the result obtained by annealing the Ti-24Nb-4Zr alloy at 300 ° C and lower than that at 800 ° C.