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Effect of Y on Microstructure and Mechanical Properties of a Ti Alloy

Journal Materials Science Forum (Volumes 654 - 656)
Volume PRICM7
Edited by Jian-Feng Nie and Allan Morton
Pages 460-463
DOI 10.4028/www.scientific.net/MSF.654-656.460
Citation Zhi Guang Liu et al., 2010, Materials Science Forum, 654-656, 460
Online since June, 2010
Authors Zhi Guang Liu, Chang Jiang Zhang, Li Hua Chai, Yu Yong Chen, Kee Do Woo
Keywords High Temperature Titanium Alloy, Mechanical Properties, Microstructure, Yttrium
Abstract

A near-α high temperature titanium alloy, Ti-6Al-2.5Sn-4Zr-0.7Mo-0.30Si, was produced with various Y contents from 0 to 0.7wt% by arc-melting technique to study the influence of Y on its microstructure and mechanical properties. It was found that small amount of Y obviously refines the grain size of Ti-6Al-2.5Sn-4Zr-0.7Mo-0.30Si alloy. SEM and TEM observations revealed that Y-containing phase precipitated at the β grain boundary in the form of Y2O3 particles. Hardness and compression tests performed at room temperature revealed the strengthening effect of Y.

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