Abstract
Magnesium alloys can be used for reducing the weight of various structural products, because of their high specific strength. They have attracted considerable attention as materials with a reduced environmental load, since they help to save both resources and energy. In order to use Mg alloys for manufacturing vehicles, it is important to investigate the deformation mechanism and transition point for optimizing the material and vehicle design. In this study, we investigated the transition of the deformation mechanism during the high-temperature uniaxial tensile deformation of the AZ31 Mg alloy. At a test temperature of 523 K and an initial strain rate of 3×10−3 s-1, the AZ31 Mg alloy (mean grain size: ~5 μm) exhibited stable deformation behavior and the deformation mechanism changed to one dominated by grain boundary sliding.
Highlights
There has been a strong demand for measures that can be adopted to improve the energy efficiency of vehicles and to reduce CO2 emission
The level of work hardening as well as the maximum stress decreased as the initial strain rate decreased and the test temperature increased; a stationary deformation area and massive extension were observed under low stress
On the basis of the experimental results, we found that the strength and breaking elongations of the AZ31 Mg alloy were dependent on the test temperature and strain rate at high temperatures; we found that the mode of breaking changed from one involving constriction to one involving uniform elongation as the test temperature increased and the initial strain rate decreased
Summary
There has been a strong demand for measures that can be adopted to improve the energy efficiency of vehicles and to reduce CO2 emission. One such measure involves further reducing the weight of members or devices in vehicles [1,2,3]. Possible measures for weight reduction include reducing the number of vehicle parts, decreasing the member thickness, and using light materials. Another approach is to use Mg alloys, which are the lightest and the most promising metallic materials [4,5,6]. Increasing the use of Mg alloys in the vehicle members of transport devices involves many challenges, including optimizing the plastic working and strengthening the alloys to allow the fabrication of members with various shapes
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