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Multi-dimensional morphology of hydride diffusion layer and associated sequential twinning in commercial pure titanium

Abstract : The dominant hydride precipitates have been well demonstrated to follow two types of orientation relationships (ORs) with Ti matrix: OR1 with { 0 0 01 } // { 0 01 } , < 1 2 10 > // < 110 > and OR2 with { 0 0 01 } // { 1 1 1 } , < 1 2 10 > // < 110 >. Within the grains with special orientations, the complicated interactions of different hydride variants inside Ti-hydride diffusion layer are characterized in this work. For OR1 hydride layer, the orientations of { 10 1 0 } plane parallel to the sample surface and a-axis parallel to the normal direction prefer multiple OR1 variants. The orientations favorable for OR2 hydride layer are: { 10 1 3 } plane parallel to sample surface corresponding to the layer with one OR2 variant dominated and c-axis parallel to the surface normal with multiple OR2 variant layer preferred. Furthermore, { 10 1 2 } extension twins and { 11 2 2 } contraction twins are activated to accommodate the OR2 hydride-induced surface expansion and local misfit strain. The stimulation of these two twins is also orientation-dependent: { 10 1 2 } and { 11 2 2 } twins are observed in the grains with c-axis parallel to and deviated from the surface normal, respectively. The further variant selection for each twin mode is performed through shear accommodation of hydride-twin pairs.
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https://hal-cnrs.archives-ouvertes.fr/hal-03863823
Contributor : Jean-Sébastien LECOMTE Connect in order to contact the contributor
Submitted on : Tuesday, November 22, 2022 - 2:29:27 PM
Last modification on : Wednesday, November 23, 2022 - 4:01:59 AM

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Qian Wang, Shun Xu, Yajun Zhao, Jean-Sébastien Lecomte, Christophe Schuman. Multi-dimensional morphology of hydride diffusion layer and associated sequential twinning in commercial pure titanium. Journal of Materials Science and Technology, 2021, 103, pp.105-112. ⟨10.1016/j.jmst.2021.07.010⟩. ⟨hal-03863823⟩

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