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对铸态Ti-46Al-0.5W-0.5Si合金进行淬火回火热处理,获得了近层片组织和双态组织。对两种不同组织的合金进行室温拉伸试验,并对试样断口和断口附近的组织进行分析,研究了拉伸断裂机制。结果表明:双态组织比近层片组织具有更好的室温塑性和抗拉强度。双态组织中的裂纹可以绕过较小的γ相颗粒,沿γ相和α2/γ片层团的界面扩展,也会以穿越层片的方式扩展。而近层片组织中的裂纹则是以沿片层和穿越片层的混合方式扩展。
The as-cast Ti-46Al-0.5W-0.5Si alloy was quenched and tempered to obtain the near-layer and dual-phase microstructure. Tensile tests were conducted on the alloys of two different kinds of alloys at room temperature. The fracture of the specimen and the structure near the fracture were analyzed, and the tensile fracture mechanism was studied. The results show that the bimodal structure has better room-temperature plasticity and tensile strength than the near-surface tissue. Cracks in the bimodal microstructure can bypass smaller γ-phase particles and propagate along the interface between γ-phase and α2 / γ lamellae and propagate through the lamellae. However, the cracks in the near-surface sheet structure extend in a mixed manner along the sheet layer and through the sheet layer.