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Texture-dependent dwell fatigue response of titanium

Yazar, KU and Shamitha, M and Suwas, S (2021) Texture-dependent dwell fatigue response of titanium. In: Philosophical Magazine, 101 (12). pp. 1443-1470.

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Official URL: https://doi.org/10.1080/14786435.2021.1916116


This study investigates heterogeneity in the deformation of an annealed sheet of commercially pure titanium (cp-Ti), its variation with loading direction and its influence on dwell fatigue response. Cp-Ti sheet with a typical cold rolling texture was deformed, along its rolling direction (RD) and transverse direction (TD), to the same strain level in tension. Higher level of grain boundary sliding in TD led to increased surface roughness (30 higher) in TD when compared to RD. Whereas, the higher extent of grain boundary-affected zones in TD resulted in a higher level of strain gradient, as evident from higher Kernal Average Misorientation values observed in TD. The reason for the higher extent of grain boundary sliding and formation of grain boundary-affected zones in TD samples was higher compatibility issues in TD. This work proposes a criterion defining the compatibility of a boundary. This criterion, which is based on the c-axis deviation of constituent grains with respect to the loading axis and the geometric compatibility of slip systems, is demonstrated to define the compatibility of a boundary completely. Using this criterion, a higher fraction of incompatible boundaries is identified in TD. Moreover, the markedly superior dwell fatigue response of RD samples when compared to TD is partly attributed to the lower heterogeneity in the nature of deformation in the former. Furthermore, textures with less damage prone grain boundaries and hence better dwell fatigue resistance is also proposed. Taken together, the present work underlines the principal role of crystallographic texture on the mechanical behaviour in general and dwell fatigue in particular. © 2021 Informa UK Limited, trading as Taylor & Francis Group.

Item Type: Journal Article
Publication: Philosophical Magazine
Publisher: Taylor and Francis Ltd.
Additional Information: The copyright for this article belongs to Taylor and Francis Ltd.
Keywords: Cold rolling; Deformation; Grain boundary sliding; Surface roughness; Textures; Titanium metallography; Titanium sheet, Cold rolling textures; Commercially Pure titaniums; Crystallographic textures; Grain boundary affected zone; Loading direction; Mechanical behaviour; Rolling direction; Strain gradients, Fatigue of materials
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 27 Jul 2021 10:08
Last Modified: 27 Jul 2021 10:08
URI: http://eprints.iisc.ac.in/id/eprint/68958

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