Experimental Evidence of Dislocation Slip in Gum Metal-type β titanium Alloy
In this study,a Gum Metal-type β titanium alloy with a nominal composition of Ti-23Nb-0. 7Ta-2Zr-l. 2O (at. ％) was elaborated by cold crucible levitation melting. In situ tensile tests in a transmission electron microscope (TEM) were carried out to investigate the plastic deformation mechanisms. Dislocations with a/2<lll> Burgers vectors are observed to glide in 110 and 112 planes. Screw dislocations have a lower mobility than non-screw dislocations. This is attributed to the core structure configuration of screw dislocations. This core structure is spread threedimensionally in several planes in a sessile state and has to recombine in a glissile state to glide. The transition between these two core configurations is the mechanism that controls the plastic deformation. Conventional dislocation glide is shown to be the only mechanism of plastic deformation operating in this Gum Metaltype alloy.
β titanium alloy Gum Metal dislocations transmission electron microscopy (TEM) in situ tensile tests
Philippe Castany Magali Besse Thierry Gloriant
INSAdeRennes,UMR CNRS 6226 SCR/Chimie-Mkallurgie,20 avenue des Buttes de Coesmes,35708Rennes cedex 7,France
国际会议
The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)
北京
英文
905-908
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）