Flame-resistant Ca-containing AZ31 magnesium alloy sheets with good mechanical properties fabricated by a combination of strip casting and high-ratio differential speed rolling methods
- Authors
- Kim, Y. H.; Kim, W. J.
- Issue Date
- Mar-2015
- Publisher
- KOREAN INST METALS MATERIALS
- Keywords
- alloys; severe plastic deformation; superplasticity; tensile test; differential speed rolling
- Citation
- METALS AND MATERIALS INTERNATIONAL, v.21, no.2, pp.374 - 381
- Journal Title
- METALS AND MATERIALS INTERNATIONAL
- Volume
- 21
- Number
- 2
- Start Page
- 374
- End Page
- 381
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/10321
- DOI
- 10.1007/s12540-015-4338-5
- ISSN
- 1598-9623
- Abstract
- This study reported that a combination of strip casting and high-ratio differential speed rolling (HRDSR) can produce flame-resistant Mg alloy sheets (0.7 wt%Ca-AZ31: 0.7Ca-AZ31) with good room-temperature mechanical properties and high-temperature formability. HRDSR effectively refined the coarse microstructure of the strip-casting processed 0.7Ca-AZ31 alloy. As the result, the (true) grain size was reduced to as small as 2.7 mu m and the (Mg, Al)(2)Ca phase was broken up to fine particles with an average sizes of 0.5 mu m. Due to the advantage of having such a highly refined microstructure, the HRDSR-processed 0.7Ca-AZ31 alloy sheet exhibited a high yield stress over 300 MPa and good superplasticity at elevated temperatures. The deformation mechanism of the fine-grained 0.7Ca-AZ31 alloy in the superplastic regime was identified to be grainboundary-diffusion or lattice-diffusion controlled grain boundary sliding.
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Collections - Graduate School > Materials Science and Engineering > 1. Journal Articles
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