Abstract
Magnesium alloys are characterized by their light weight, high specific strength and high specific rigidity. Therefore, it is expected to be an effective material for energy saving in the field of transportation equipment. However, the corrosion and wear resistance of magnesium alloys is much lower than those of steel materials. For this reason, surface modification is performed using surface treatment techniques such as vapor deposition and plating. In the present study, dissimilar materials were joined using particle impact such as shot peening to modify the surface of magnesium alloy. The test material was a commercially available magnesium alloy, and the dissimilar metal sheets are pure aluminum, pure copper, pure nickel, pure iron, and stainless steel. The thickness of the various thin sheets ranges from 0.02 to 0.06 mm. Shot peening was done with mechanical equipment. The projectiles had an average diameter of 1 mm and were made of cast steel. The processing speed was 60 m/s, and the processing time was 20 s. The joinabilities of the thin sheets were evaluated by cross-sectional observation and bending tests. When the processing temperature was 300 oC or higher, various types of thin sheets could be bonded to the base material. There were no voids or cracks at the bonding interface. After the bending test, the tightly bonded metal sheet broke along with the base material.
