Journal
MATERIALS & DESIGN
Volume 98, Issue -, Pages 333-343Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2016.03.045
Keywords
Magnesium alloy; AZ31; Twinning; Crystal plasticity; EVPSC
Categories
Funding
- Fundamental Research Funds for the Central Universities [2015XKZD02]
- National Natural Science Foundation of China [51501220]
- National Key Basic Research Program of China [2013CB632204]
- Natural Sciences and Engineering Research Council of Canada (NSERC)
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In plane tension of magnesium alloy sheets is accommodated by prismatic and basal slip, whereas {10-12} twinning is activated when grains are elongated along the < c > axis. The plastic behavior of Mg-3Al-1Zn in tension has been investigated using a thick rolled plate with a strong basal texture. Tensile tests were performed along five directions distributed between the normal direction and the transverse direction, allowing various amount of {10-12} twinning, basal, and prismatic slip to take place. The twinning behavior has been investigated using EBSD measurement and EVPSC modeling, and Schmid factor analysis was performed. The observed amount of variants with a Schmid factor of high rank is higher than predicted, emphasizing the necessity of strain accommodation between grains and twins. Compared with compression, even when twinning activity is low, more {10-12} twin variants are predicted in tension. This study confirms extension twinning as a major deformation mechanism in all tensile directions and an efficient way to harden Mg alloys by twin-twin boundaries. (C) 2016 Elsevier Ltd. All rights reserved.
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