将定向层片组织铸造Ti-47.5Al-2.5V-1.0Cr(at％)合金在α+γ两相区分别进行了1270℃,180 MPa下1h,1.5h和2.5h的热等静压处理,然后在800℃和300 MPa条件下进行了持久断裂试验,以研究热等静压处理对该合金持久性能的影响.试验结果表明,在1270℃/180 MPa条件下,热等静压分别持续1h,1.5h和2.5h后,相比未经热等静压处理的铸态试样,其800℃/300 MPa持久寿命均明显降低,降低幅度分别为64.4％,70.2％和82.0％,但其持久塑性均明显提高.结合持久断口的断裂特征分析及微观组织观察认为,热等静压过程中析出的等轴γ晶粒可促进持久加载过程中动态再结晶的发生以及显微空洞的生成,由此导致了持久寿命的降低;此外,相比等轴γ晶粒析出的体积分数,其本身的存在对该合金800℃和300 MPa持久寿命有更直接的影响.
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