《Table 2 Microhardness of some phases in magnesium alloy (MPa)》

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《时效硬化Mg-10Y-1.5Sm合金的强度稳定性（英文）》

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The strength of magnesium alloy at high temperature depends on thermal stability of strengthening phase at grain boundaries.Considering the microhardness of phases in magnesium alloy（in Table 2）[16]，the thermal stability of Mg24Y5 phase in Mg-Y alloy is much higher than that of Mg17Al12 phase in Mg-Al alloy and Mg Zn phase in Mg-Zn alloy.The thermal stability of strengthening phase determines the heat resistant temperature of the alloy and its position in heat resistant magnesium alloys.Judged from that the hardness drop of strengthening phase is less than20%，the heat resistant temperature of Mg-Al alloy and Mg-Zn alloy does not exceed 200oC.They are consistent with the existing research results.The hardness（HV）ofMg24Y5 decreases slowly with the increase of temperature，from 2180 MPa at 20oC to 1730 MPa at 300oC，and the drop is a little more than 20%.So Mg-Y alloys（such as WE54）have good heat resistance and their maximum applied temperature is up to 300oC.