Plastic deformation mechanisms of AZ31 magnesium alloy under high strain rate compression
(1. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China;
2. School of Information and Communication Engineering, North University of China, Taiyuan 030051, China)
2. School of Information and Communication Engineering, North University of China, Taiyuan 030051, China)
Abstract: The twinning and slip activities of AZ31 magnesium alloy sheet at a strain rate of 1 200 s−1 were investigated. Dynamically mechanical properties of various oriented samples were measured using Split Hopkinson Pressure Bar(SHPB). Optical microscope observations reveal that the dominant deformation mechanism is twinning for 90˚ oriented sample, and is slip for 45˚ and 0˚ oriented samples. TEM analysis for samples at a strain of 0.3% shows that the main deformation mechanisms for 90˚, 45˚ and 0˚ oriented sample are and twinning, basal slip and non basal slip, respectively. The main features of the true stress—true strain curves can be explained based on deformation mechanism analysis.
Key words: AZ31 magnesium alloy; twinning; basal slip, non basal slip