论文部分内容阅读
通过室温静态拉伸和扭转试验,结合TEM、SEM等分析检测方法,系统研究了片层Ti-55531合金在拉伸和扭转载荷下的断裂失效行为。结果表明,片层Ti-55531合金在拉伸和扭转载荷下的断裂失效有显著的不同:拉伸变形受滑移、次生α_s的孪生及剪切共同控制,扭转变形主要受滑移和剪切控制,未发现有孪晶;拉伸断口较扭转断口陡峭,失效以微孔聚集为主,含少量穿晶解理和沿晶开裂的混合断裂机制;扭转断裂失效则以微孔聚集和剪切开裂为主,含部分穿晶解理的混合断裂机制。无论在拉伸还是扭转载荷下,片层Ti-55531合金的断裂失效面均由最大剪切应力产生,剪切力比正应力更易使片层Ti-55531合金损伤破坏。
Tensile failure behavior of Ti-55531 alloy under tension and torsion loading was investigated systematically by static tensile test and torsion test combined with TEM and SEM. The results show that the fracture failure of Ti-55531 alloy under tensile and torsional loads is significantly different: the tensile deformation is controlled by the slip and secondary α_s secondary and shear, and the torsional deformation is mainly controlled by slip and shear And no twins were found. Tensile fracture was more steep than that of the torsional fracture, and the failure was dominated by micropore aggregation with a small amount of mixed fracture mechanism of transgranular cleavage and intergranular cleavage. The torsional fracture failure was dominated by micropore aggregation and shear Cracking-based, with part of the transgranular cleavage mechanism of mixed fracture. The fracture failure surface of Ti-55531 alloy is caused by the maximum shear stress in both tensile and torsional loads, and the shear stress is more likely to damage the Ti-55531 alloy than the normal stress.