GW103K indicates the composition ratio of Mg-10Gd-3Y-0.5Zr-0.4Ca. This is a magnesium alloy developed by adding some rare earth elements to strengthen its high function and heat resistance for general magnesium alloys. Due to the excellent aging strengthening effect of rare earth elements Y and Gd, some researchers have added light rare earth elements to magnesium alloys to develop GW series magnesium alloys, mainly hoping to obtain magnesium alloys with good strength and heat resistance as well as high strength and heat resistance.