| Autor: |
N. Velisavljevic, G. N. Chesnut, D. M. Dattelbaum, Y. K. Vohra, A. Stemshorn, Mark Elert, Michael D. Furnish, William W. Anderson, William G. Proud, William T. Butler |
| Rok vydání: |
2009 |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings. |
| ISSN: |
0094-243X |
| Popis: |
In group IV metals (Ti, Zr, and Hf) room temperature compression leads to a martensitic transformation from a ductile α to a brittle ω phase. The α→ω phase boundary decreases to lower pressure at high temperature and can limit the use of group IV metals in industrial applications. There is a large discrepancy in the transition pressure reported in literature, with some of the variation attributed to experimental conditions (i.e. hydrostatic vs. non‐hydrostatic). Shear deformation in non‐hydrostatic experiments drives α→ω transition and decreases transition pressure. Impurities can also aid or suppress α→ω transition. By performing x‐ray diffraction experiments on samples in a diamond anvil cell we show that interstitial impurities, such as C, N, and O can obstruct α→ω transition and stabilize α phase to higher pressure. We also show that reduction in grain size can also influence α–ω phase boundary and help stabilize α phase to higher pressure under non‐hydrostatic conditions. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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