Improvement of interfacial bonding strength in roll-bonded Mg/Al clad sheets through annealing and secondary rolling process
SCIE
SCOPUS
- Title
- Improvement of interfacial bonding strength in roll-bonded Mg/Al clad sheets through annealing and secondary rolling process
- Authors
- Jung-Su Kim; Kwang Seok Lee; Yong Nam Kwon; Lee, BJ; Chang, YW; Lee, S
- Date Issued
- 2015-03-25
- Publisher
- ELSEVIER
- Abstract
- The effect of annealing and secondary rolling process has been investigated in relation to evolution of interface microstructure as well as interfacial bonding mechanisms of roll-bonded two-ply Mg/Al clad sheets in this study. Two types of thin reaction layers, viz., gamma (Mg17Al12) and beta (Mg2Al3) phase layers, were observed to form along the Mg/Al interface, the thickness of which was found to increase with annealing time. The grains in the y layer were grown coarsely in a columnar shape, as they grew continuously in coarse-grained Mg substrate alloy side. The thickness of the y layer was found to reduce significantly after the secondary one-pass rolling. At the same time, the initially columnar y grains became refined into equi-axed grains by recrystallization caused by large plastic deformation during the secondary rolling. The serrated flow observed in the reaction layers during a nano-indentation test in the y layer disappeared completely without any sign of micro-cracks after the secondary rolling. This in turn implies that the y layer, acted as an embrittlement site before the rolling, may not be brittle any longer after the rolling. The grain refinement and disappearance of columnar grains in the y layer appear to greatly improve the interfacial bonding strength in these clad sheets. This secondary rolling process seems to provide a great advantage in terms of manufacturing, since the same rolling stand for roll-bonding process can also be used without any additional equipment. (C) 2015 Elsevier B.V. All rights reserved.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/107967
- DOI
- 10.1016/J.MSEA.2015.01.035
- ISSN
- 0921-5093
- Article Type
- Article
- Citation
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, vol. 628, page. 1 - 10, 2015-03-25
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