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研究了显微组织中含针状α2相的Ti3Al－Nb（Ti－24Al－14Nb－3V－0．5Mo）（摩尔分数，％）合金的拉伸断裂行为。结果表明，合金经α2＋β两相区较低温度940℃固溶1h水冷处理后，会从基体B2相中析出针状的α2相。裂纹通常萌生于针状α2相内部．穿过针状α2相扩展。等轴状初生α2相对裂纹的扩展有钝化作用，而针状α2相的存在对合金的塑性不利。
The tensile fracture behavior of Ti3Al-Nb (Ti-24Al-14Nb-3V-0.5Mo) (mole fraction,%) alloy with acicular α2 phase in the microstructure was investigated. The results show that the α2 phase is precipitated from the B2 phase of the matrix after the solution is solidified at 940 ℃ for 1h by the α2 + β two-phase region. Cracks usually occur in the acicular α2 phase. Across the acicular α2 phase expansion. Equivalent primary α2 relative crack propagation passivation, and the presence of acicular α2 phase alloy detrimental to plasticity.