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Small amount Of antimony addition to the Mg-9Al-0.8Zn-0.2Mn (AZ91) alloy resulted in the obvious increase of tensile strengths at both ambient and elevated temperatures.The creep resistance at the temperatures ap to 200℃ was also improved significantly by antimony addition. Mcrostructurul observations revealed that the addition of antimony modified morphology of the α(Mg17Al12) phase and caused the formation of some rod-shaped precipitates Mg3b2 at grain boundaries. These precipitates have high thermal stability and play an important role for strengthening groin boundaries at elevated temperutures.
Small amount Of antimony addition to the Mg-9Al-0.8Zn-0.2Mn (AZ91) alloy resulted in the obvious increase of tensile strengths at both ambient and elevated temperatures. Creep resistance at the temperatures ap to 200 ° C was also improved significantly by antimony addition. Mcrostructurul observations revealed that addition of antimony modified morphology of the α (Mg17Al12) phase and caused the formation of some rod-shaped precipitates Mg3b2 at grain boundaries. These precipitates have high thermal stability and play an important role for gro groving boundaries at elevated temperutures.