Surface terraces in pure tungsten formed by high temperature oxidation
<p style="text-align:justify;"> We observe large-scale surface terraces in tungsten oxidised at high temperature and in high vacuum. Their formation is highly dependent on crystal orientation, with only {111} grains showing prominent terraces. Terrace facets are aligned with {100} c...
| Main Authors: | , , , , |
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| Format: | Journal article |
| Language: | english |
| Published: |
Elsevier
2019
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| _version_ | 1797085839688204288 |
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| author | Yu, H Das, S Liu, J Hess, J Hofmann, F |
| author_facet | Yu, H Das, S Liu, J Hess, J Hofmann, F |
| author_sort | Yu, H |
| collection | OXFORD |
| description | <p style="text-align:justify;"> We observe large-scale surface terraces in tungsten oxidised at high temperature and in high vacuum. Their formation is highly dependent on crystal orientation, with only {111} grains showing prominent terraces. Terrace facets are aligned with {100} crystallographic planes, leading to an increase in total surface energy, making a diffusion-driven formation mechanism unlikely. Instead we hypothesize that preferential oxidation of {100} crystal planes controls terrace formation. Grain height profiles after oxidation and the morphology of samples heat treated with limited oxygen supply are consistent with this hypothesis. Our observations have important implications for the use of tungsten in extreme environments. </p> |
| first_indexed | 2024-03-07T02:13:37Z |
| format | Journal article |
| id | oxford-uuid:a17a3a1c-dff9-4593-85a3-afa183516ab9 |
| institution | University of Oxford |
| language | english |
| last_indexed | 2024-03-07T02:13:37Z |
| publishDate | 2019 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | oxford-uuid:a17a3a1c-dff9-4593-85a3-afa183516ab92022-03-27T02:13:28ZSurface terraces in pure tungsten formed by high temperature oxidationJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:a17a3a1c-dff9-4593-85a3-afa183516ab9englishSymplectic Elements at OxfordElsevier2019Yu, HDas, SLiu, JHess, JHofmann, F <p style="text-align:justify;"> We observe large-scale surface terraces in tungsten oxidised at high temperature and in high vacuum. Their formation is highly dependent on crystal orientation, with only {111} grains showing prominent terraces. Terrace facets are aligned with {100} crystallographic planes, leading to an increase in total surface energy, making a diffusion-driven formation mechanism unlikely. Instead we hypothesize that preferential oxidation of {100} crystal planes controls terrace formation. Grain height profiles after oxidation and the morphology of samples heat treated with limited oxygen supply are consistent with this hypothesis. Our observations have important implications for the use of tungsten in extreme environments. </p> |
| spellingShingle | Yu, H Das, S Liu, J Hess, J Hofmann, F Surface terraces in pure tungsten formed by high temperature oxidation |
| title | Surface terraces in pure tungsten formed by high temperature oxidation |
| title_full | Surface terraces in pure tungsten formed by high temperature oxidation |
| title_fullStr | Surface terraces in pure tungsten formed by high temperature oxidation |
| title_full_unstemmed | Surface terraces in pure tungsten formed by high temperature oxidation |
| title_short | Surface terraces in pure tungsten formed by high temperature oxidation |
| title_sort | surface terraces in pure tungsten formed by high temperature oxidation |
| work_keys_str_mv | AT yuh surfaceterracesinpuretungstenformedbyhightemperatureoxidation AT dass surfaceterracesinpuretungstenformedbyhightemperatureoxidation AT liuj surfaceterracesinpuretungstenformedbyhightemperatureoxidation AT hessj surfaceterracesinpuretungstenformedbyhightemperatureoxidation AT hofmannf surfaceterracesinpuretungstenformedbyhightemperatureoxidation |