A Unified Constitutive Model for Quasi-Static Flow Responses of Pure Ta and Ta-W Alloys
SCIE
SCOPUS
- Title
- A Unified Constitutive Model for Quasi-Static Flow Responses of Pure Ta and Ta-W Alloys
- Authors
- Park, CH; Hong, SG; Lee, CS
- Date Issued
- 2011-01-25
- Publisher
- ELSEVIER
- Abstract
- This study aims to develop a unified constitutive model describing the flow behaviors of pure Ta and Ta-W alloys over a wide range of strain rate and temperature. The model was based on the previously suggested model by Nemat-Nasser and Isaacs [3] and was further extended to capture the hardening effects caused by the changes in solute contents and concentrations, and grain size; while interstitial solutes (C, N, and O) increased the thermal stress, substitutional solute (W) increased both the thermal and athermal stresses. The results showed that the developed model can provide a reasonable prediction on the flow behaviors of pure Ta and Ta-W alloys (Ta-2.47W, Ta-5.2W, and Ta-9.8W) with different grain sizes of 0.3-45 mu m over a strain rate range of 1-10(-6)s(-1) and a temperature range of 77-900 K without any change in the material constants used. (C) 2010 Elsevier B.V. All rights reserved.
- Keywords
- Constitutive model; Flow stress; Solute atom; Grain size; Tantalum; CENTERED-CUBIC METALS; STRAIN RATES; WIDE-RANGE; NANOSTRUCTURED MATERIALS; DEFORMATION-BEHAVIOR; MECHANICAL-BEHAVIOR; PLASTIC-DEFORMATION; TANTALUM; TEMPERATURES; STRESS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/16602
- DOI
- 10.1016/J.MSEA.2010.10.057
- ISSN
- 0921-5093
- Article Type
- Article
- Citation
- Materials Science and Engineering A, vol. 528, no. 3, page. 1154 - 1161, 2011-01-25
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