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Composition-mediated abnormal phase evolution in Ta-W films with Cr buffer layers.
- Source :
-
Scripta Materialia . Jan2024, Vol. 238, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- With the monotonically increasing of W from 0 to 20 at. % in Ta-W films with Cr buffers, an abnormal phase evolution of α-Ta→β-Ta→α-Ta was found, which is due to the breaking and rebuilding of α-Ta nucleation. A small amount of W addition could disturb the epitaxial growth of α-Ta on Cr layers by refining the nucleus size. Nevertheless, as a completely miscible system, Ta-W solid solutions are preferred to possess the α-Ta structure. With the increasing W content, the nucleation barrier of α-Ta is correspondingly lower, facilitating the rebuilding of α-Ta growth. The effect of phase evolution competes with that of solid solution strengthening in the controlling mechanism of Ta-W hardness. The hardness of the sample with low W contents is largely influenced by the proportion of β-Ta, while the solid solution strengthening effect is more pronounced in high W. [Display omitted] [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13596462
- Volume :
- 238
- Database :
- Academic Search Index
- Journal :
- Scripta Materialia
- Publication Type :
- Academic Journal
- Accession number :
- 172427329
- Full Text :
- https://doi.org/10.1016/j.scriptamat.2023.115759