Plastic deformation, damage and rupture of PM Ti-6Al-4V at 20 K under monotonic loading

被引：36
|
作者：
Di Iorio, Stephane
Briottet, Laurent
Rauch, Edgar F.
Guichard, Didier
机构：
[1] CEA, LITEN, DTH, LEV, F-38054 Grenoble, France
[2] ENSPG, INPG, CNRS, UMR 5010,GPM2, F-38402 St Martin Dheres, France
[3] SNECMA, F-27208 Vernon, France
来源：
ACTA MATERIALIA | 2007年 / 55卷 / 01期
关键词：
titanium alloys; electron backscattered diffraction; low temperature deformation; twinning; fracture;
D O I：
10.1016/j.actamat.2006.08.011
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The deformation, damage and rupture mechanisms at cryogenic temperature of an extra low interstitial Ti-6Al-4V alloy obtained by powder metallurgy are investigated through tensile tests, scanning electron microscopy observations, electron backscattered diffraction (EBSD) mapping and finite elements analysis. Crystallographic orientations, measured through EBSD, allow three different twinning modes to be identified. Among them, one has never been indexed in titanium alloys. At 20 K, half of the deformation is carried by twinning. Damage is controlled by the cavities nucleation step, which is also strongly related to twinning. These cavities appear at the very end of the deformation process and their growth and coalescence are rapid. Correlations between these results and finite element calculations are used to build damage as well as rupture maps that help to interpret the failure of the alloy. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：105 / 118
页数：14
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