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研究添加Bi对AZ80镁合金铸态显微组织及力学性能的影响。结果表明:将Bi加入到AZ80镁合金中后,粗大的β-Mg17Al12离异共晶组织被细化并由连续网状分布变为断续状;晶界处和枝晶间出现具有六方D52结构的针状和颗粒状的Mg3Bi2相。力学性能测试结果表明:随着Bi含量的增加,抗拉强度和伸长率先升高再降低,AZ80-0.5%Bi合金的综合力学性能最优;当Bi含量超过1.0%(质量分数)时,针状相明显变多并粗化,加载时容易开裂而割裂基体,导致力学性能降低。
The effects of Bi addition on the microstructure and mechanical properties of as-cast AZ80 magnesium alloy were investigated. The results show that after the addition of Bi into AZ80 magnesium alloy, the coarse β-Mg17Al12 dissimilar eutectic structure is refined and changes from continuous network to discontinuous; the needle with hexagonal D52 structure appears at the grain boundaries and dendrites Like and granular Mg3Bi2 phase. The results of mechanical properties test show that the tensile strength and elongation increase first and then decrease with the increase of Bi content. The mechanical properties of AZ80-0.5% Bi alloy are the best. When the Bi content exceeds 1.0% (mass fraction) Obviously more like and coarsening shape, easy to crack and split the substrate load, resulting in reduced mechanical properties.