期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2013.06.074
关键词
Texture; Twinning; Volume fraction recrystallized; Flow softening; AZ31 magnesium alloy
类别
资金
- Natural Sciences and Engineering Research Council of Canada
- National Natural Science Foundation of China [51075132]
- Program of International Science & Technology Cooperation [2010DFB70180]
- Supporting Program of the Twelfth Five-year Plan for Science & Technical Research of China [2011BAG03B02]
The compression tests were carried out on AZ31 magnesium alloy samples at temperatures from 300 to 450 degrees C and strain rates of 0.03-0.3 s(-1). The evolution of the microstructure and texture was followed and the volume fractions recrystallized were determined as a function of strain and temperature. The flow curves were analyzed using the double differentiation method and double minima were detected on all the curves. The first set of minima is shown to identify the critical strain for twinning, while the second set indicates the critical strain for the initiation of dynamic recrystallization. The texture analysis and EBSD results indicate that flow softening is mainly caused by the grain reorientations brought about by twinning. The remainder of the flow softening is associated with the volume fraction recrystallized. The microstructure analysis shows that the volume fraction recrystallized does not approach its asymptotic value of one even during steady state flow. (c) 2013 Elsevier B.V. All rights reserved.
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