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AE4 2的铸态组织主要包含了α镁和少量的针状Al11RE3相 ,呈典型的树枝晶分布 .少量Ca的加入使合金组织细化并形成新相Al2 Ca ,Al2 Ca主要呈现分布在晶界的层片状形貌和弥散在晶粒内部的颗粒状形貌 .随着Ca的加入量增多 ,Al11RE3的体积百分比降低 ,相应Al2 Ca含量增加 .拉伸性能方面 ,Ca的加入使合金的屈服强度在室温和高温下都有显著提升 ,随之延伸率有少量降低 .Ca的加入还使合金在室温和 15 0 ℃ 下抗拉强度下降 .温度的提高使Ca对抗拉强度的影响逐渐加大 ,175℃和 2 0 0℃下 ,随Ca含量的增加抗拉强度逐渐增大 .
The as-cast microstructure of AE4 2 mainly contains α-Mg and a small amount of acicular Al11RE3 phase with a typical dendritic distribution.The addition of a small amount of Ca results in refinement of the alloy structure and formation of a new phase, Al2Ca, which is mainly distributed at grain boundaries The lamellar morphology and the granular morphology dispersed inside the grains.With the increase of Ca content, the volume fraction of Al11RE3 decreases and the content of Al2Ca increases.The tensile properties, the addition of Ca makes the alloy yield The strength at room temperature and high temperature have significantly increased, with a slight decrease in elongation Ca addition also makes the alloy at room temperature and 15 0 ° C under the tensile strength decreased temperature Ca so that the impact of tensile strength gradually increased , 175 ℃ and 200 ℃, with the increase of Ca content, the tensile strength increases gradually.