Quantification of strain localisation in a bimodal two-phase titanium alloy

SCRIPTA MATERIALIA

卷:145

Article

Lunt, D.¹  Xu, X.¹  Busolo, T.¹  da Fonseca, J. Quinta¹  Preuss, M.¹ 

[1] Univ Manchester, Ctr Mat Sci, Manchester M13 9PL, Lancs, England

关键词: Titanium alloys;    Slip;    HRDIC;    Plastic deformation;    Tension test;   

DOI  :  10.1016/j.scriptamat.2017.10.012

来源: Elsevier

【 摘 要 】

High Resolution Digital Image Correlation in combination with orientation imaging microscopy has been applied to compare quantitatively strain localisation in Ti-6AI-4V alloy with a bimodal microstructure subjected to two different ageing treatments, i.e. above and below the alpha(2) solvus temperature. Interestingly, the most pronounced strain heterogeneity was observed in the secondary-alpha regions for the sample heat-treated to promote alpha(2) formation. The high local strain was associated with intense slip bands within single long secondary-alpha laths with low levels of neighbouring strain, which is likely to have a significant impact on the low-cycle fatigue performance. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd.

【 授权许可】

Free