Effect of thermomechanical processing on microstructural evolution and deformation behaviour of polycrystalline magnesium under quasi-static and high strain rate conditions |
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Authors: | Bidyapati Mishra D Vijay Kumar Chetan Pakhare K N Jonnalagadda |
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Institution: | 1. Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Mumbai, India;2. Defence Metallurgical Research Laboratory, Hyderabad, India;3. Department of Mechanical Engineering, Indian Institute of Technology Bombay, Mumbai, India |
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Abstract: | AbstractThe effect of thermomechanical processing on microstructure evolution and room temperature flow behaviour of polycrystalline magnesium in compression at strain rates of ~10?2 and ~103 s?1 was investigated. Different initial microstructures were produced by optimising rolling and annealing cycles. Prior to annealing for 1 h at 350 °C, Mg samples were processed by two different treatments such as (i) hot rolling at 350 °C and (ii) hot rolling at 350 °C plus cold rolling at room temperature. Introduction of cold working step led to an increased fraction of hard oriented grains with a marginal grain size difference in post-annealed samples. A profound effect of thermomechanical processing on strain hardening rate as well as rate-sensitive flow behaviour of Mg was observed. The influence of prior processing history and strain rate on flow behaviour of Mg was clearly reflected in terms of texture strengthening/weakening phenomena and formation of microstructural deformation bands. |
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Keywords: | Magnesium rolling microstructure texture compression high strain rate |
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