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通过力学性能测试、金相和扫描电镜分析等手段,研究了不同Fe含量挤压铸造Al-7.8Zn-2.5Mg-1.6Cu合金的微观组织和力学性能。结果表明,挤压压力由0增大到75 MPa时,0.4%Fe含量合金的力学性能逐渐接近0.1%Fe含量合金的力学性能。同时,随着挤压压力的增大,富Fe相的分布形态由晶界处的聚集分布逐渐变为离散的短杆状均匀分布,增大挤压压力明显降低Fe对材料力学性能的有害影响。
The microstructure and mechanical properties of Al-7.8Zn-2.5Mg-1.6Cu alloy by squeeze casting with different Fe content were studied by mechanical properties test, metallographic examination and scanning electron microscopy. The results show that the mechanical properties of 0.4% Fe alloy gradually approached the mechanical properties of 0.1% Fe alloy when the extrusion pressure increased from 0 to 75 MPa. At the same time, with the increase of extrusion pressure, the distribution of Fe-rich phase gradually changes from the aggregation distribution at the grain boundary to a discrete, short rod-like distribution. Increasing the extrusion pressure significantly reduces the harmful effect of Fe on the mechanical properties of the material .