Evaluation of Microstructure Effect on Anisotropic Mechanical Properties of Hot Rolled AZ31 by AE Analysis
Anisotropic properties of twinning and slip deformation of hot rolled and extruded AZ31 Mg alloy have been reported in our previous researches. AE (Acoustic Emission) measurement has been done during the tensile test of specimen with various angles between tensile direction and rolled or extruded direction. AE energy had good correlation with twinning area and 0.2% proof stress. It has been also reported that twinning stress has higher grain size dependence than the stress required for activation of slip because the Hall-Petch slope for twinning is larger than that for slip. In this research, tensile test specimen were prepared from rolled AZ31 with various angles between tensile and rolling directions. In order to change grain size of hot rolled AZ31 Mg alloy, the specimens were annealed at various temperatures. Then in-situ measurement of AE signals was conducted during the tensile test. The mechanical deformations occurring actually were found by EBSD (Electron Backscatter diffraction) and observation of fracture surface. According to the result, the effect that grain size of hot rolled AZ31 Mg alloy gives to anisotropic mechanical properties during the tensile test was quantitatively evaluated by AE analysis.
Acoustic Emission AZ31 Annealing Anisotropy Twinning
Kousuke Matsumoto Takashi Yasutomi Manabu Enoki
Department of Materials Engineering,The University of Tokyo,7-3-1 Hongo,Bunkyo-ku,Tokyo 113-8656,Japan
国际会议
北京
英文
1-10
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）