V元素对Ti-V-Cr系阻燃钛合金热强性的影响

Effect of V on the Thermal Stability and Creep of Ti-V-Cr Burn-Resistant Titanium Alloy

配制不同V含量的3种阻燃钛合金,分别测试其在不同热暴露和蠕变工艺下的热稳定性能和蠕变性能,并观察其显微组织。结果表明,随V元素含量的增加,合金热稳定性能和抗蠕变性能提高,并且V元素的含量对热稳定性能和蠕变性能的影响存在一个最佳含量,小于该含量时,V元素含量对热稳定性能和抗蠕变性能影响较大,大于该含量时,含量增加对其性能影响不大。在讨论中指出,V元素对热稳定性能和蠕变性能的影响主要表现在对β相稳定性的影响,对TiCr2相形成过程的影响和与空位的相互作用三个方面,并详细论述了其机理。

Three kinds of Ti-V-Cr burn-resistant titanium alloys with different V contents have been prepared. The creep, thermal stabilities and microstructure are tested under different conditions. The result shows that the thermal stabilities and creep properties of alloys are improved with the increase of V contents up to an optimal content of about 25 %, It is mainly due to the effect on the stability of β phase, the effect on the forming process of TiCr2 phase, and the interaction of V element and vacancy, Their mechanisms are analyzed in detail at last.