Mechanisms of deformation in gum metal TNTZ-O and TNTZ titanium alloys: A comparative study on the oxygen influence

被引：184
作者：
Besse, M. [1 ]
Castany, P. [1 ]
Gloriant, T. [1 ]
机构：
[1] INSA Rennes, UMR CNRS SCR Chim Met 6226, F-35708 Rennes 7, France
来源：
ACTA MATERIALIA | 2011年 / 59卷 / 15期
关键词：
Titanium alloys; Microstructure; Tensile tests; Electron backscatter diffraction (EBSD); Transmission electron microscopy (TEM); TRANSMISSION ELECTRON-MICROSCOPY; PLASTIC-DEFORMATION; ALPHA'' MARTENSITE; IN-SITU; ELASTIC PROPERTIES; BEHAVIOR; SUPERELASTICITY; MICROSTRUCTURE; TRANSFORMATION; TI-6AL-4V;
D O I：
10.1016/j.actamat.2011.06.006
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this work, Ti-23Nb-0.7Ta-2Zr (TNTZ) and gum metal Ti-23Nb-0.7Ta-2Zr-1.2O (TNTZ-0) alloys were synthesized by cold crucible levitation melting with the objective of investigating the influence of oxygen on the deformation mechanisms. By tensile tests, electron backscatter diffraction, atomic force microscopy and transmission electron microscopy analyses, we showed that the deformation in the TNTZ-O alloy is only accommodated by dislocation slip. Thus, the addition of oxygen suppresses the formation of alpha '' martensite and prevents the twinning deformation mechanism, which were both observed in the TNTZ alloy. In addition, in situ tensile tests in a transmission electron microscope showed that conventional a/2 < 1 1 1 > dislocation slip occurs widely in the TNTZ-O alloy. Screw dislocations have a lower mobility than non-screw dislocations. Cross-slip is shown to be easy and multiplication of dislocations by a double cross-slip mechanism occurs extensively, leading to the formation of large slip bands. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：5982 / 5988
页数：7
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