Microstructure and Mechanical Properties of Al-7.5Cu-1Si with Fe Content Prepared by Powder Metallurgy
摘要
This study investigated the effects of the Fe content on the microstructure and mechanical properties of Al–7.5Cu–1Si alloys prepared via powder metallurgy. The results indicated that the alloy initially consisted of α, Al2Cu and Si phases without Fe. When the Fe content was 2 wt pct, the Al4Cu9, Al7Cu2Fe, Al2Fe and Al13Fe4 phases appeared in the alloy, whereas the Al2Cu and Si phases decreased. With increasing Fe content, the Al7Cu2Fe phase gradually increased, the Al4Cu9 phase gradually increased and dispersed, and the Al2Cu phase and Si phase gradually decreased. As the Fe content increased, the sintered density and hardness of the alloy varied drastically, and the tensile strength first tended to increase but then decreased. When the Fe concentration was 1 wt pct, the maximum sintering density of the alloy was 98.5 pct. When the Fe concentration was 6 wt pct, the maximum hardness of the alloy was 63.5HB. When the content of Fe was 2 wt pct, the maximum tensile strength of the alloy was 182 MPa.