Compositional dependence of the deformation behaviour of ultrahigh-purity Ti-Al alloys
SCIE
SCOPUS
- Title
- Compositional dependence of the deformation behaviour of ultrahigh-purity Ti-Al alloys
- Authors
- Pyo, SG; Oh, J; Yoo, MS; Kim, NJ; Yamaguchi, M
- Date Issued
- 2004-10-01
- Publisher
- TAYLOR & FRANCIS LTD
- Abstract
- The present study is concerned with the effect of the O and Al concentrations on the deformation behaviour of ultrahigh-purity (UHP) Ti-(48, 50, 52) at.% Al alloys using UHP Ti with 30 wt ppm O. It has been shown that yield strength increases with increasing O content. Stoichiometric Ti- 50 at.% Al alloys had the lowest yield strength and the highest ductility when the O content was sufficiently low. It is suggested that the deformation mechanism of UHP binary Ti- Al is strongly related to the Al concentration. The deformation substructure of UHP Ti-48 at.% Al is shown to be dominated by ordinary dislocation as well as deformation twinning and a small portion of superdislocations. The deformation substructure of UHP Ti-50 at.% Al alloy was similar to that of Ti-48 at.% Al, but deformation twinning was not observed. Most of dislocation structures of UHP Ti-52 at.% Al alloy consisted of faulted dipoles. The major deformation mode of UHP Ti-48 at.% Al and UHP Ti- 50 at.% Al alloys was ordinary dislocation in deformation orientation, which takes advantage of ordinary dislocation slip. However, the major deformation mode in this orientation for UHP Ti-52 at.% Al alloys was superdislocation slip.
- Keywords
- INTERMETALLIC COMPOUND; DUCTILITY; MECHANISMS; STOICHIOMETRY; DISSOCIATION
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/29684
- DOI
- 10.1080/147864304100
- ISSN
- 1478-6443
- Article Type
- Article
- Citation
- PHILOSOPHICAL MAGAZINE, vol. 84, no. 28, page. 3001 - 3017, 2004-10-01
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