Joining of Mg alloy with dissimilar materials by shot lining

Abstract

Resins and light metals are being used to reduce the weight of transportation equipment such as automobiles and airplanes. In the case of light metals, magnesium alloys are attracting attention because they have the lowest density among practical metals. It is about one-third lighter than aluminum. Further, the specific strength and specific rigidity of magnesium are higher than those of aluminum and resin. However, compared to other practical metals, the wear resistance and corrosion resistance of magnesium alloys are quite low. In the present study, surface modification of magnesium alloy was performed by shot lining. Shot lining is a method of joining dissimilar materials using shot peening. Dissimilar laminate materials with excellent wear resistance and corrosion resistance were joined together, and the improvement effect was investigated. Test materials were corrosion-resistant metal foils such as pure titanium and pure nickel, hard alumina powder, and thermoplastic resin sheet. Shot peening was performed using a centrifugal machine using cast steel blasting materials. The bondability of dissimilar laminated sheet was evaluated by bending tests. Corrosion resistance test was evaluated by immersion in supersaturated aqueous sodium chloride solution. In addition, the wear resistance was evaluated by the amount of wear using an abrasion tester. It was found that the surface properties of magnesium alloys were improved by joining dissimilar laminated sheet.