Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 32, Issue 12, Pages 1289-1296Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2016.11.015
Keywords
Mg-Li alloys; Hot deformation; Constitutive equation; Processing maps; Dynamic recrystallization
Funding
- National Natural Science Foundation [51601024]
- National Key Research and Development plan [2016YFB0700403]
- Chongqing Research Program of Basic Research and Frontier Technology [cstc2016jcyjA0418]
- Fundamental Research Funds for the Central Universities [106112015CDJXY130011, CDJZR14130007]
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Hot deformation behavior of an as-extruded duplex structured Mg-9Li-3Al-2.5Sr alloy is investigated via hot compression tests conducted at 200-350 degrees C with strain rate of 0.001-1 s(-1). The flow behavior of Mg-9Li-3Al-2.5Sr alloy can be described accurately by hyperbolic sine constitutive equation and the average activation energy for deformation is calculated as 143.5 kJ/mol. Based on a dynamic materials model, the processing maps of Mg-9Li-3AI-2.5Sr alloy which describe the variation of power dissipation efficiency are constructed as a function of temperature and strain rate. The processing maps exhibit an area of discontinuous dynamic recrystallization occurring at 280-300 degrees C with strain rate of 0.001-0.01 s(-1), which corresponds to the optimum hot working conditions. Copyright (C) 2016, The editorial office of Journal of Materials Science & Technology. Published by Elsevier Limited.
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