An M-coated Mg-8 mass％ Li alloy rectangular bar was fabricated by hot extrusion,and then,it was hot-rolled into a thin sheet.The Al coating was uniform in thickness and had good bonding with the substrate during all the processing.This Alcoated Mg-Li alloy exhibited a good corrosion resistance in a 0.5 mass％ HCl aqueous solution.No intermetallic compound was observed at the Al/Mg-Li interface after the extrusion and the rolling.The Al-coated Mg-Li alloy sheet exhibited an elongation to fracture of 35％ at room temperature at a strain rate of 0.001 s-1 without any debonding between the coating and the substrate.When tensile tested at 573 K at 0.001 s-1 in the air,the Al coating remained undamaged even until an elongation of about 150％.Further elongation generated cracks on the coating and the specimen fractured at an elongation of about 200％.In an Ar atmosphere,the specimen exhibited a fracture elongation of over 400％ under the same conditions at 573 K at 0.001 s-1,although a large number of cracks generated on the Al coating.