Local deformation mechanisms of two-phase Ti alloy

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:649

Article

Jun, Tea-Sung¹  Sernicola, Giorgio¹  Dunne, Fionn P. E.¹  Britton, T. Benjamin¹ 

[1] Univ London Imperial Coll Sci Technol & Med, Dept Mat, Royal Sch Mines, London SW7 2AZ, England

关键词: Micropillar compression;    Two-phase Ti alloys;    EBSD;    Micromechanics;   

DOI  :  10.1016/j.msea.2015.09.016

来源: Elsevier

【 摘 要 】

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 (alpha-beta-alpha) 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 alpha/beta 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 beta phase can significantly alter the apparent yielding point and work hardening response. The role of interfaces within these tri-crystal pillars is discussed. (C) 2015 The Authors. Published by Elsevier B.V.

【 授权许可】

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