High Strain Rate Compressive Behavior of As-Cast and Heat Treated Magnesium-Rare Earth Alloy at Low Temperatures

Chongchen Xiang, Yi Yang, Nikhil Gupta

Research output: Contribution to journalArticle

Abstract

The deformation behavior and mechanical properties of magnesium-rare earth alloy (WE43) were investigated for as-cast and heat-treated conditions at a broad range of strain rates and temperatures. The study was focused on developing a constitutive relation for the alloy with respect to temperature and strain rate for the as-cast and heat treated conditions. The experimental results show higher strength of the alloy at lower temperatures. Heat treatment of the alloy has a remarkable effect on the alloy microstructure, where eutectic mixture dissolves and only rare earth rich precipitates are observed in the heat treated microstructure. This change in the microstructure was reflected in the measured tensile properties and heat treated alloy has higher strength due to strengthening effect of the fine precipitates. A constitutive model was established to describe the thermo-viscoplastic flow behavior of the hexagonal close-packed alloy in a broad range of coupled strain rates (0.0001/s–3055/s) and temperatures (77–296 K). The model predictions agree with the experimental results at both quasi-static and high strain rates. The results show the possibility of extending this work to develop time–temperature superposition procedures using the coupling parameters identified by the model.

Original languageEnglish (US)
JournalJournal of Dynamic Behavior of Materials
DOIs
StateAccepted/In press - Jan 1 2020

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Keywords

  • Constitutive modeling
  • High strain rate properties
  • Magnesium alloy
  • Strain rate

ASJC Scopus subject areas

  • Materials Science (miscellaneous)
  • Mechanics of Materials

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