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The research used the creep time law method to analyze the creep behavior for the magnesium alloy. The purpose of the study is to build the analytic model of the creep behavior for such magnesium alloy. Creep properties of specimens taken from the AZ80 and AZ61 magnesium alloy were investigated in the temperature range 150~180℃ and stress range 50~91MPa.The accelerative creep rupture tests for the two magnesium alloys under constant-temperature and constant-load were carried out to set up the basic high temperature creep rupture data base, then processing the relative analysis of creep properties with creep time low method. The following conclusions are: ( 1 ) the creep life would improve with decrease of the stress;the minimum creep rate would reduce with decrease of the stress when the temperature is constant. ( 2 ) Under the same experimental conditions, the creep life of AZ80 alloy is better than AZ61alloy;the creep strain rate of AZ80 alloy is lower than AZ61 alloy. ( 3 ) After creep test, the discontinuous βphase (Mg17Al12) represented the grain boundaries. Microcracks were always observed in this region after the creep experiment. ( 4 ) The creep time law method certainly has the ability to describe the creep behavior of this two alloys, but the description of creep rate can not match very well. ( 5 ) The creep properties can be converted into mathematical models certainly after analysis by creep time law method.
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