科研之友
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摘要
The Al-7.5Zn-2.8Mg-2.0Cu alloys with two different iron concentrations after squeeze casting with pressure as a process parameter were investigated with respect to the microstructure and mechanical properties.The effects of pressure and iron concentration on the fracture behavior were determined.The results showed that the iron-rich phases seriously degraded the alloys in mechanical properties.An increased pressure of squeeze casting could however decrease the harmful effect of iron.With increasing pressure, the mechanical properties of the alloy with a higher iron concentration became closer to those of the alloy with a lower iron concentration.In addition, the fracture mode changed from intergranular fracture caused by concentrated stresses on Fe-rich particles to a dimple pattern and the distribution of Fe-rich particles changed from aggregates at the grain boundaries to homogeneous dispersoids in the form of short rods.
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