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

被引：10

作者：

Xu, Xuesong ^{[1
,2
]}

Ding, Hongsheng ^{[1
]}

Huang, Haitao ^{[1
]}

Liang, He ^{[1
]}

Ramanujan, R. V. ^{[2
]}

Chen, Ruirun ^{[1
]}

Guo, Jingjie ^{[1
]}

Fu, Hengzhi ^{[1
]}

机构：

[1] Harbin Inst Technol, Sch Mat Sci & Engn, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Peoples R China

[2] Nanyang Technol Univ, Sch Mat Sci & Engn, 50 Nanyang Ave, Singapore 639798, Singapore

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2023年 / 171卷

基金：

中国国家自然科学基金;

关键词：

TiAl alloy; Fatigue; Twinning; Dislocation; Coordinated deformation; CRACK GROWTH; HIGH-TEMPERATURE; MECHANICAL-PROPERTIES; FRACTURE-BEHAVIOR; ROOM-TEMPERATURE; HIGH DUCTILITY; HIGH-STRENGTH; SLIP TRANSFER; FAULT ENERGY; MICROSTRUCTURE;

D O I：

10.1016/j.ijfatigue.2023.107597

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

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 gamma phase was dominated by superlattice dislocations [0 1 1] and twin-ning. Dislocations 11 0 in the B2 phase can be induced by twins in the adjacent gamma 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 gamma phase.

引用

页数：10

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