Figueiredo, Roberto B., Poggiali, Flávia S.J., Silva, Cláudio L.P., Cetlin, Paulo R. and Langdon, Terence G. (2016) The influence of grain size and strain rate on the mechanical behavior of pure magnesium. Journal of Materials Science, 51 (6), 3013-3024. (doi:10.1007/s10853-015-9612-x).
Abstract
Commercially pure magnesium was processed by severe plastic deformation techniques and thermo-mechanical routes to produce samples with grain sizes in the range from 1.0 to 300 µm. Tensile testing of a fine-grained material revealed a decrease in hardening and an increase in strain rate sensitivity with decreasing testing strain rate from 10?2 to 10?7 s?1. Compression testing of fine-grained samples not only revealed similar trend, but also there was a transition from twinning to slip-dominated flow. Dynamic ultra-microhardness testing showed an increase in strain rate sensitivity with decreasing grain size. The trend of decreasing hardening rate and increasing strain rate sensitivity with decreasing strain rate was not observed in samples with a coarser grain size. Compression testing at different temperatures suggests that a creep mechanism with stress exponent of ~7 and activation energy close to grain boundary diffusion operates at low strain rates and moderate temperatures. A model for a new deformation mechanism is proposed based on the present experimental results and published data.
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- Faculties (pre 2018 reorg) > Faculty of Engineering and the Environment (pre 2018 reorg)
- Faculties (pre 2018 reorg) > Faculty of Engineering and the Environment (pre 2018 reorg) > Mechanical Engineering (pre 2018 reorg)
Current Faculties > Faculty of Engineering and Physical Sciences > School of Engineering > Mechanical Engineering > Mechanical Engineering (pre 2018 reorg)
Mechanical Engineering > Mechanical Engineering (pre 2018 reorg) - Faculties (pre 2018 reorg) > Faculty of Engineering and the Environment (pre 2018 reorg) > Mechanical Engineering (pre 2018 reorg) > Engineering Mats & Surface Engineerg Gp (pre 2018 reorg)
Current Faculties > Faculty of Engineering and Physical Sciences > School of Engineering > Mechanical Engineering > Mechanical Engineering (pre 2018 reorg) > Engineering Mats & Surface Engineerg Gp (pre 2018 reorg)
Mechanical Engineering > Mechanical Engineering (pre 2018 reorg) > Engineering Mats & Surface Engineerg Gp (pre 2018 reorg)
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