Abstract
Energy saving is desired in development of transportation vehicles by adapting lightweight materials like fuel efficiency with magnesium alloys. However, magnesium has insufficient mechanical properties. Therefore grain refinement was conducted for AZ31 (Mg-3Al-1Zn-0.2Mn, by mass %) alloy by severe plastic working with caliber rolling to enhance its toughness and strength. The most suitable process in caliber rolling was elucidated, and the resultant mechanical properties were evaluated by quasi-static tensile test and impact three-point bending test. As a result, a strain distribution by FEM showed that multipass caliber rolling is the most suitable process. Tensile yield strength was increased to more than 270 MPa after the 12 pass rolling. The absorbed energy until a crack reached 0.4mm was increased by a factor of four from that of the initial as-cast state.
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