Multi-dimensional morphology of hydride diffusion layer and associated sequential twinning in commercial pure titanium
| Autor: | Qian Wang, Yajun Zhao, Jean-Sébastien Lecomte, Shun Xu, Christophe Schuman |
|---|---|
| Rok vydání: | 2022 |
| Předmět: |
Surface (mathematics)
Materials science Polymers and Plastics Hydride Mechanical Engineering Metals and Alloys chemistry.chemical_element Diffusion layer Shear (sheet metal) Orientation (vector space) Crystallography chemistry Mechanics of Materials Materials Chemistry Ceramics and Composites Crystal twinning Normal Titanium |
| Zdroj: | Journal of Materials Science & Technology. 103:105-112 |
| ISSN: | 1005-0302 |
| Popis: | The dominant hydride precipitates have been well demonstrated to follow two types of orientation relationships (ORs) with Ti matrix: OR1 with { 0001 } / / { 001 } , 1 2 ¯ 10 > / / 110 > and OR2 with { 0001 } / / { 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. |
| Databáze: | OpenAIRE |
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