Constitutive analysis of the high-temperature deformation of Ti-6Al-4V with a transformed microstructure
SCIE
SCOPUS
- Title
- Constitutive analysis of the high-temperature deformation of Ti-6Al-4V with a transformed microstructure
- Authors
- Kim, JH; Semiatin, SL; Lee, CS
- Date Issued
- 2003-10-20
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Abstract
- The high-temperature deformation mechanisms of Ti-6Al-4V with a transformed microstructure were determined within the framework of inelastic-deformation theory. For this purpose, load-relaxation tests were conducted on samples with a lamellar structure containing different alpha-platelet thicknesses at temperatures of 715-900 degreesC. The flow stress-versus-strain rate curves for all the microstructures were well fit with an inelastic-deformation equation describing grain-matrix deformation (GMD) (dislocation glide + dislocation climb). However, for heavily pre-deformed specimens, grain-boundary sliding (GBS) as well as GMD was evident. The GBS rate was found to be most rapid for the microstructure with the thinnest alpha laths/platelets. Softening of heavily deformed material was attributed to a decrease in the internal-strength variable sigma* associated with reduced alpha-beta interface strength and to the occurrence of GBS. (C) 2003 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
- Keywords
- Ti-6Al-4V; internal-variable theory; deformation mechanisms; dynamic globularization; HOT-WORKING; PLASTIC-FLOW; MECHANICAL-BEHAVIOR; SUPERPLASTICITY; TITANIUM; ALLOY; GLOBULARIZATION; RELAXATION; EVOLUTION; MODE
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/18276
- DOI
- 10.1016/S1359-6454(0
- ISSN
- 1359-6454
- Article Type
- Article
- Citation
- ACTA MATERIALIA, vol. 51, no. 18, page. 5613 - 5626, 2003-10-20
- Files in This Item:
- There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.