Experimental study of dislocation mobility in a Ti-6Al-4V alloy

被引：128

作者：

Castany, P. ^{[1
]}

Pettinari-Sturmel, F. ^{[1
]}

Crestou, J. ^{[1
]}

Douin, J. ^{[1
]}

Coujou, A. ^{[1
]}

机构：

[1] CNRS, CEMES, F-31055 Toulouse, France

来源：

ACTA MATERIALIA | 2007年 / 55卷 / 18期

关键词：

titanium alloys; transmission electron microscopy (TEM); dislocation dynamics; in situ; tension test;

D O I：

10.1016/j.actamat.2007.07.032

中图分类号：

T [工业技术];

学科分类号：

08 [工学];

摘要：

By in situ TEM deformation experiments, we studied in detail the deformation micromechanisms of a Ti-6Al-4V alloy at room temperature. All dislocations have an a-type Burgers vector and glide essentially in prismatic or basal planes. They are first emitted from alpha/beta interfaces and take a preferential orientation along their screw direction. The motion of screw dislocations controls the strain rate. Our experiments allow the microscopic parameters of plasticity for this alloy to be determined for the first time. The results concerning the screw dislocation motion, its core structure and the influence of interfaces are then discussed in comparison with previously published results. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

收藏

页码：6284 / 6291

页数：8

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