Local deformation mechanisms of two-phase Ti alloy

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• 作者：Tea-Sung Jun ; ^{t.jun@imperial.ac.uk" class="auth_mail" title="E-mail the corresponding author} ; Giorgio Sernicola ; Fionn P.E. Dunne ; T. Benjamin Britton
• 关键词：Micropillar compression ; Two-phase Ti alloys ; EBSD ; Micromechanics
• 刊名：Materials Science & Engineering A
• 出版年：2016
• 出版时间：1 January 2016
• 年：2016
• 卷：649
• 期：Complete
• 页码：39-47
• 全文大小：5283 K

文摘

This paper describes a study of local deformation mechanisms in two-phase Ti alloy, Ti–6Al–2Sn–4Zr–2Mo, by performing in-situ micropillar compression tests. A colony microstructure was examined and select grains identified for examination were chosen with EBSD measurements. These grains were chosen to isolate individual slip systems within each test. Micropillars of tri-crystal (伪–尾–伪) structure were fabricated from four determined regions, and compression tests were performed using a displacement-controlled nanoindenter set inside a SEM, with a constant displacement rate. The results show that the 伪/尾 morphology significantly affects the local deformation behaviour. For these colony structures, Schmid's law in general enables anticipation of local slip activity, but the presence and morphology of the 尾 phase can significantly alter the apparent yielding point and work hardening response. The role of interfaces within these tri-crystal pillars is discussed.