Effect of Omega Phase on Deformation Behavior of Ti-7.5Mo-xFe Alloys

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Title:	Effect of Omega Phase on Deformation Behavior of Ti-7.5Mo-xFe Alloys
Authors:	林殿傑(Dan-Jae, Lin);陳瑾惠(Jiin-Huey, Chern Lin);朱建平(Chien-Ping, Ju)*
Contributors:	健康照護學院口腔衛生學系
Keywords:	titanium alloy;molybdenum;iron;omega phase;electron microscopy;plastic deformation
Date:	2002-07
Issue Date:	2009-08-19 17:00:26 (UTC+8)
Abstract:	In an earlier study, it was found that Ti-7.5Mo-1Fe and Ti-7.5Mo-2Fe alloys exhibited markedly different mechanical properties. While Ti-7.5Mo-2Fe alloy exhibited excellent mechanical properties, Ti-7.5Mo-1Fe alloy showed an extremely brittle behavior. The present study is a continual research on these two particular alloys with a focus on the effect of omega phase on the deformation behavior of the alloys. The results indicate that 2Fe alloy exhibited a ductile type fracture surface covered with normal deformation dimples. The fracture surface of 1Fe alloy exhibited a terrace-like morphology with numerous sub-micron-sized dimples. Throughout the entire plastically deformed region of 1Fe alloy, {112} (111) type twins were observed, but few twins formed in 2Fe alloy. It is suggested that the numerous, larger-sized W particles in 1Fe alloy have effectively restricted the slip of dislocations that largely limited plastic deformation capability of the alloy. The less and smaller w particles could not do the same to 2Fe that led to the observed ductile behavior.
Relation:	MATERIALS CHEMISTRY AND PHYSICS76(2):191~197
Appears in Collections:	[Department of Dental Hygiene] Journal articles

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