High-temperature torsion induced gradient microstructures in high Nb-TiAl alloy

被引：10

作者：

Ding, Jie ^{[1
]}

Lin, Junpin ^{[1
]}

Zhang, Minghe ^{[1
]}

Dong, Chengli ^{[2
]}

Liang, Yongfeng ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China

[2] Beijing Inst Aeronaut Mat, Natl Key Lab Sci & Technol Adv High Temp Struct M, Beijing 100095, Peoples R China

来源：

MATERIALS LETTERS | 2017年 / 209卷

基金：

美国国家科学基金会; 中国国家自然科学基金;

关键词：

Torsion; Intermetallic alloy; Gradient structure; Recrystallization; HIGH-PRESSURE TORSION; MECHANICAL-PROPERTIES; INTERMETALLIC ALLOYS; OXIDATION; EVOLUTION; CREEP;

D O I：

10.1016/j.matlet.2017.07.124

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The high temperature torsion deformation of a duplex microstructure high Nb-TiAl alloy was investigated at 850 degrees C. The experimental results showed that the hardness and the density of twins increased with radial distance from the center to rim of 180 degrees torsion sample. Besides, the "recrystallized", "substructured" and "deformed" microstructures were also presented gradient and forming sub-grains was the transition stage between recrystallization and deformation. Moreover, gamma grain recrystallization at twin-twin junctions occurred and the observation of dislocation-twin interactions revealed the formation of secondary twins by dissociating of the dislocation at twin-twin boundary. The dissociation of such dislocations interacting with twin boundaries and gamma grain recrystallizations at twin-twin boundaries avoided excessive stress concentration, which allowed the alloy to continue plastic deformation. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：193 / 196

页数：4

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