Tsutomu Murai

Effects of extrusion conditions on microstructure and mechanical properties of AZ31B magnesium alloy extrusions

Abstract The effects of billet homogenization and extrusion conditions on microstructure and mechanical properties of AZ31B magnesium alloy extrusions is investigated. Mg–Al and Mg–Al–Zn compounds observed in the cast billet disappear with homogenization. Further, elongation of the extrusion increases with homogenization. As extrusion ratio increases, elongation of the extrusion also increases due to grain refining. When billet temperature is lower and extrusion speed is smaller, grain size of the extrusion decreases. As a result, the elongation of the extrusion increases.

Effects of Manganese Contents on Extruded Magnesium Alloys

Effects of manganese contents in AZ31 and AZ10 on billets microstructure, extrusion loads, occurring of surface cracks and mechanical properties were investigated. In the range 0 to 0.8% manganese content, there exist an adequate manganese content for avoiding surface cracks and obtaining the highest tensile strength.

Warm Hydroforming Process with Non-Uniform Heating for AZ31 Magnesium Alloy Tube

In this study, non-uniform heating approach in warm T-joint forming process is attempted for the AZ31 magnesium alloy tube. For this purpose, finite element simulation is performed to analyze the appropriate temperature distribution. The validity of the finite element(FE) model of T-joint tube hydroforming(THF) is verified by comparing the FE simulation and experimental results. Using this FE model, appropriate temperature distribution was suggested. In addition, it was showed that the wall thickness could be more uniform by optimizing the temperature condition.