论文部分内容阅读
The effect of Ca addition on the microstructure and impression creep properties of AS31 magnesium alloy was investigated in the current study.The results showed that the microstructure of AS31 alloy is composed of α(Mg) phase,massive Mg_(17)Al_(12) and some Chinese script Mg_2Si compounds.Addition of 2 wt%Ca to AS31 alloy resulted in complete elimination of Mg_(17)Al_(12) phase and formation of Al_2Ca compound.Ca improved the alloy’s creep properties especially at higher temperature.Improvement in the creep properties was attributed to the elimination of soft Mg_(17)Al_(12) and formation of thermally stable Al_2Ca compound.According to the obtained stress exponent and creep activation energy,pipe diffusion climb-controlled creep was estimated as the dominant creep mechanism and Ca had no influence on the dominant mechanism.
The effect of Ca addition on the microstructure and impression creep properties of AS31 magnesium alloy was investigated in the current study. The results showed that the microstructure of AS31 alloy is composed of α (Mg) phase, massive Mg_ (17) Al_ (12) and some Chinese script Mg_2Si compounds. Addition of 2 wt% Ca to AS31 alloy resulted in complete elimination of Mg_ (17) Al_ (12) phase and formation of Al_2Ca compound. Ca improved the alloy’s creep properties especially at higher temperature. Impression in the the creep properties was attributed to the elimination of soft Mg 17 Al 12 and formation of thermally stable Al 2 Ca compound. Accredited to the obtained stress exponent and creep activation energy, pipe diffusion climb-controlled creep was estimated as the dominant creep mechanism and Ca had no influence on the dominant mechanism.