Slip-twinning interdependent activation across phase boundaries: An in-situ investigation of a Ti-Al-V-Fe (α+β) alloy
Name
SLWei_Acta_2020(b).pdf
Description
Accepted version
Size
2.75 MB
Format
Adobe PDF
Checksum (MD5)
6821816143f04212725c23137b07b4f5
Author(s)
Wei, Shaolou
Zhu, Gaoming
Tasan, Cemal Cem
Date Issued
2021
Journal
Acta Materialia
Publisher
Elsevier BV
Citation
Wei, Shaolou, Zhu, Gaoming and Tasan, Cemal Cem. 2021. "Slip-twinning interdependent activation across phase boundaries: An in-situ investigation of a Ti-Al-V-Fe (α+β) alloy." Acta Materialia, 206.
Version
Author's final manuscript
Abstract
© 2020 Microstructural plastic strain distribution evolution is highly heterogeneous even in single-phase alloys. One of the important factors that govern this heterogeneity is slip/twinning transfer across grain/phase boundaries. In this regard, the fundamentals of transfer across grain boundaries have drawn significant attention in the literature, while the understanding of phase boundaries remains comparatively limited. (α+β) titanium alloys provide a profound platform to explore these phenomena, since: (i) both of the present phases can exhibit plastic deformation at similar microscopic strain levels; and (ii) both dislocation slip and mechanical twinning can be triggered to accommodate plastic strain. In the present work, we evidenced a deformation transfer unit involving dislocation slip in the β-phase and {101¯2}-mechanical twin in the α-phase. We revealed by crystallographic calculations that the combination of Schmid factor and the Luster-Morris compatibility factor enables a rational quantification for the inception propensity of the slip-twinning transfer event. Our in-situ strain mapping approach verified that this sort of transfer activity can plausibly alleviate strain incompatibility/localization, demonstrating the potential to facilitate deformation homogeneity.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licens
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DOI of Published Version
https://doi.org/10.1016/J.ACTAMAT.2020.116520
