空気圧を用いた水中衝撃波によるMg合金の変形挙動に関する研究

抄録

Mg alloys have excellent material properties such as light specific weight and high specific strength. However, it is difficult to perform the cold plastic working due to insufficient cold workability of these alloys. In order to expand the application range of Mg alloys, it is necessary to develop the new method, which is suitable for the cold plastic working of commercial Mg alloys. Therefore, an attempt was made to realize the cold plastic working of commercial Mg alloys using an impact hydraulic forming method. The purpose of this study is to investigate the application possibility of the impact hydraulic forming method using commercial Mg alloy (AZ31 alloy). In this study, we developed the impact hydraulic forming system. In this system, underwater shock wave can be generated using air pressure as the power source and projectile. First, relationships between the air pressure and both the projectile speed and underwater shock wave peek stress were evaluated using pressure measurement film and light emitting-receiving element. Second, deep drawing properties of AZ31 alloy were evaluated using developed system. In addition, effect of annealing for the deep drawing properties of AZ31 alloy was investigated. As the result, it was found that the annealing of AZ31 alloy improves the cold workability of AZ31 alloy even in the processing using the developed system. Also, it was confirmed that the peak stress of generated under shock wave can be controlled by the value of air pressure.