晶体孪晶
材料科学
层错能
打滑(空气动力学)
超晶格
合金
变形(气象学)
变形机理
位错
相(物质)
凝聚态物理
叠加断层
结晶学
冶金
复合材料
微观结构
热力学
物理
有机化学
化学
光电子学
作者
Xuesong Xu,Hongsheng Ding,Haitao Huang,Liang He,R.V. Ramanujan,Ruirun Chen,Jingjie Guo,Haipeng Fu
标识
DOI:10.1016/j.ijfatigue.2023.107597
摘要
The deformation mechanism responsible for the high-cycle rotating bending fatigue of a high-Nb TiAl alloy was investigated. Fatigue deformation in the γ phase was dominated by superlattice dislocations [0 1 1¯] and twinning. Dislocations 〈1 1 0〉 in the B2 phase can be induced by twins in the adjacent γ phase, which has a low stacking fault energy owing to the high Nb content. Stress transfer between two adjacent phases can be accomplished through atomic rearrangement of the interface by twinning. The local stresses were accommodated by the continuous dislocation slip of the B2 phase, deformation twins, and twin intersections in the γ phase.
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