Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 527, Issue 16-17, Pages 4250-4256Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2010.03.062
Keywords
Mg-Zn-Ca alloy; Equal channel angular pressing; Processing route; Texture; Mechanical properties
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Funding
- National Natural Science Foundation of China [50201005, 50571031]
- Program for New Century Excellent Talents in University [NCET-08-0169]
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Mg-5.25 wt.% Zn-0.6 wt.% Ca alloy was subjected to equal channel angular pressing (ECAP) at 250 degrees C using route A, Bc and C. respectively, in order to investigate the effect of shearing strain path on microstructure, texture and mechanical properties. Route Bc was the most effective in grain refinement and generating high angle grain boundaries, while route A was the least effective. Different textures were developed when a different ECAP route was applied. After ECAP using route A, the tensile yield strength (TYS) got much higher than those of the as-extruded alloy, which was primarily resulted from the strengthening due to the grain refinement. Because the Schmid factor for basal slip system was changed only a little, the texture soften effect was not obvious. After ECAP using route C, TYS of the Mg alloy was significantly decreased although the grain size was significantly refined, because the texture softening effect was dominant over the strengthening due to the grain refinement. (C) 2010 Elsevier B.V. All rights reserved.
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