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Abstract
We have investigated {332}<113> twinning and detwinning mechanisms in a multilayered Ti-10Mo-xFe (x =1−3) alloy fabricated by multi-pass hot rolling. A strong influence of the Fe-graded structure on both phenomena is observed. The propagation of twins that are nucleated in Fe-lean regions (∼1 wt.% Fe) is interrupted in the grain interiors at about 2 wt% Fe. We ascribe this effect to the role of the Fe content on the stress for twin propagation. The unusual twin structure determines the subsequent detwinning process upon thermal annealing. This process consists of two independent detwinning events that occur at two different microstructural regions, namely at twin tips located at grain interiors and at grain boundaries. Both detwinning modes can be explained from a thermodynamic standpoint whereby the boundary dissociation processes minimize the boundary free energy.
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Details
1 National Institute for Materials Science, Sengen 1-2-1, Tsukuba, Ibaraki, Japan
2 National Institute for Materials Science, Sengen 1-2-1, Tsukuba, Ibaraki, Japan; Graduate School of Pure and Applied Sciences, University of Tsukuba, Ibaraki, Japan