Novel multilayer structure design of metallic glass film deposited Mg alloy with superior mechanical properties and corrosion resistance

• We fabricated a novel multilayer structure of Mg alloy.
• The multilayer consists of metallic glass film, gradient structure and the matrix.
• Metallic glass film increases wear and corrosion resistance of the alloy.
• Gradient structure by SMAT decreases hardness mismatch between film and the matrix.
• Decreased hardness mismatch prevents film from delamination under high load.

A novel multilayer structure of metallic glass film deposited Mg alloy was designed and fabricated by combining surface mechanical attrition treatment and magnetron sputtering. The multilayer structure consists of amorphous layer and gradient structure sequentially from surface, following with the coarse grains inside. Gradient structure significantly decreases hardness mismatch between the amorphous layer and the matrix of Mg alloy. Wear resistance is increased by 2 orders for this novel multilayer structure with the simultaneous improvement of corrosion resistance.