Anisotropy in fracture toughness and toughening mechanism of Ti-22Al-25Nb alloy related to texture and grain boundary damage

被引:0
作者
Zhang, Penghui [1 ,2 ,3 ]
Zeng, Weidong [1 ,2 ,3 ]
Zhang, Fan [1 ,2 ,3 ]
Ma, Haoyuan [1 ,2 ,3 ]
Xu, Jianwei [1 ,2 ,3 ]
Liang, Xiaobo [4 ]
Zhao, Yongqing [1 ]
机构
[1] Northwestern Polytech Univ, Sch Mat Sci & Engn, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
[2] Northwestern Polytech Univ, Def Technol Innovat Ctr Precis Forging & Ring Roll, Sch Mat Sci & Engn, Xian 710072, Peoples R China
[3] Northwestern Polytech Univ, Shaanxi Key Lab High Performance Precis Forming Te, Xian 710072, Peoples R China
[4] Cent Iron & Steel Res Inst, Beijing 100081, Peoples R China
基金
中国国家自然科学基金;
关键词
Ti-22Al-25Nb alloy; Fracture toughness; Anisotropy; Crack tip plastic zone; Crack deflection; ROOM-TEMPERATURE; O-PHASE; MICROSTRUCTURE; TITANIUM; DEFORMATION; STRENGTH;
D O I
10.1016/j.jallcom.2024.177703
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Combining the intrinsic (crack tip plasticity) and extrinsic (crack deflection) toughening mechanism, the anisotropy of fracture toughness for Ti-22Al-25Nb alloy obtain by B2 phase region isothermal forging process is discussed. The results show that the sequence of fracture toughness from high to low is RD (radial direction), OD (45 degrees to RD) and AD (axial direction). Intrinsically, it is found that the damage of lamellar O phase ahead of the crack tip dominates crack propagation. Compared with grain interior, continuous lamellar O phase on grain boundary can more easily promote the nucleation and propagation of crack, reducing the intrinsic resistance of crack propagation. Consequently, AD sample with intergranular fracture has the smallest crack tip plastic zone than RD and OD samples with transgranular fracture. Due to the activation of prism slip for O phase, the texture of RD sample has a higher Schmid factor than that of OD sample, resulting in better crack tip plasticity. Extrinsically, it can be concluded that grain boundaries have a significant effect on crack deflection due to the pancake shaped B2 morphology. For RD sample, the grain boundary is perpendicular to the initial crack plane, so the stress intensity factor (KI) required for cleavage fracture is less than that for intergranular fracture. The deflection of the cleavage facets results in the highest crack propagation tortuosity. Also, the crack propagation near grain boundary of OD sample leads to significant deflection because the grain boundary is located in the direction of maximum shear stress. Compared with RD and OD samples, the KI required for intergranular fracture of AD sample is minimum, results in a flat fracture path.
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页数:20
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