On the high creep strength of the W containing IRIS-TiAl alloy at 850 °C

被引：38

作者：

Couret, Alain ^{[1
]}

Monchoux, Jean-Philippe ^{[1
]}

Caillard, Daniel ^{[1
]}

机构：

[1] Univ Toulouse, CEMES, CNRS, 29 Rue Jeanne Marvig, F-31055 Toulouse, France

来源：

ACTA MATERIALIA | 2019年 / 181卷

关键词：

Titanium aluminides; Creep; Dislocations; Transmission electron microscopy; Glide and Climb; POSITIVE TEMPERATURE-DEPENDENCE; GAMMA-GAMMA INTERFACES; YIELD-STRESS; SINGLE-CRYSTALS; PINNING POINTS; DEFORMATION; MICROSTRUCTURE; CLIMB; DISLOCATIONS; CAST;

D O I：

10.1016/j.actamat.2019.09.056

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This paper presents a study of the creep at 850 degrees C under 150 MPa of the IRIS alloy (Ti-Al48-W2-B0.1) densified by spark plasma sintering. The dislocation microstructure in a sample strained up to 1.5% was studied by post-mortem transmission electron microscopy. The deformation is mainly due to ordinary dislocations. Several populations of dislocations are evidenced. Their Burgers vectors, the plane in which they are moving and the corresponding deformation mechanisms are determined. In the discussion section, the deformation mechanisms, the factors controlling their activation and the role of tungsten as hardening element are examined. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：331 / 341

页数：11

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