《Table 1 Chemical composition of AZ91D》

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《Effects of Calcium and Yttrium on Microstructure and Mechanical Properties of High Strain-Rate Rolled AZ91D Magnesium Alloy》

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M g alloys used in the experiment w ere made from M g（99.9%），aluminum（Al）（99.5%） and zinc（Zn）（99.9%） ，as well as intermediate alloys Mg-20%Ca and Mg-25.63%Y，as per the ingredient proportion specified in Table 1.All ingredients w ere smelt in a crucible heated by a resistance furnace.Before smelting，all tools w ere first dried，and the flux XJ-5 w as used for cover protection and refinement.w hen smelting.And the smelting temperature w as 750℃.The specific processes for making AZ91D w ere as below.M g blocks w ere first added into the crucible，and w hen M g blocks w ere melted，Zn，Al，manganese（M n）and silicon（Si）w ere added in sequence for preventing burning the intermediate-alloys.Finally，the intermediate-alloys w ere added.When all ingredients w ere added，the melt w as kept still for 15 min，refined for 5 min，and finally kept still for another 15 min.After separating the slag from the melt，the melt w as casted into ingots under the protective atmosphere of SO2.During the casting，the melt flow w as slow and smooth，and no breaks of the flow w ere allow ed.