Twinning-induced dislocation and coordinated deformation behavior of a high-Nb TiAl alloy during high-cycle fatigue

Twinning-induced dislocation and coordinated deformation behavior of a high-Nb TiAl alloy during high-cycle fatigue

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 adjacen...

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Bibliographic Details
Main Authors: Xu, Xuesong, Ding, Hongsheng, Huang, Haitao, Liang, He, Ramanujan, Raju V., Chen, Ruirun, Guo, Jingjie, Fu, Hengzhi
Other Authors: School of Materials Science and Engineering
Format: Article
Language:English
Published: 2023
Subjects:
Engineering::Materials
Fatigue
Twinning
Online Access:https://hdl.handle.net/10356/172153
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Institution: Nanyang Technological University
Language: English
Description
Summary: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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