High-strength Mg-Al-Ca alloy with ultrafine grain size sensitive to strain rate
- Authors
- Kim, W. J.; Lee, Y. G.
- Issue Date
- 25-Feb-2011
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Mechanical characterization; Magnesium alloys; Thermomechanical processing; Grain refinement; Texture
- Citation
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v.528, no.4-5, pp.2062 - 2066
- Journal Title
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
- Volume
- 528
- Number
- 4-5
- Start Page
- 2062
- End Page
- 2066
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/19933
- DOI
- 10.1016/j.msea.2010.11.037
- ISSN
- 0921-5093
- Abstract
- The microstructure, texture and mechanical properties of the 1 wt.% Ca-AZ31 alloy (1CaAZ31) processed by high-ratio differential speed rolling (HRDSR) were examined. After HRDSR, the grain size of the 1CaAZ31 decreased to similar to 0.9 mu m, and (Al, Mg)(2)Ca particles were highly refined and uniformly dispersed into the matrix. The significant improvement in strength was attributed to the effective grain-size reduction. Contribution of the particle strengthening was relatively small. Strength of the ultrafine grained (UFG) 1CaAZ31 was sensitive to strain rate. As the result, the yield stress was as high as 412 MPa at 1 x 10(-1) s(-1), while it was 292 MPa at 1 x 10(-5) s(-1). The strain-rate-sensitivity of the UFG 1CaAZ31 was 0.031-0.041, which is about twice larger than that of its annealed counterpart having coarse grains (0.018). Uniform elongation of the UFG 1CaAZ31 was small compared to that of the coarse-grained 1CaAZ31 due to the reduced strain hardening ability, but its post-uniform elongation was large due to the increased strain-rate sensitivity. (C) 2010 Elsevier B.V. All rights reserved.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - Graduate School > Materials Science and Engineering > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.