Effects of Fe and Ni additions on an emerging Al–4·4Cu–1·5Mg powder metallurgy alloy:

AbstractThe effects of Fe and Ni additions to an Al–Cu–Mg powder metallurgy alloy were studied. The transition elements were incorporated through two different approaches, admixed elemental powders and prealloying of the base Al powder. Prealloying proved to be the superior alloying technique as it did not invoke any negative effects on the general sintering behaviour of the baseline alloy. The microstructures of prealloyed materials also exhibited a refined distribution of the aluminide phases formed. These included Al7Cu2Fe, Al7Cu4Ni and Al9FeNi as identified through a combination of SEM/EDS and XRD. The most promising alloy was identified as Al–4·4Cu–1·5Mg–1Fe–1Ni as it exhibited tensile properties that exceeded those of the baseline material. This advantage was also found to persevere after thermal exposure.On a etudie les effets d’additions de Fe et de Ni sur un alliage d’Al–Cu–Mg obtenu par la metallurgie des poudres. On a incorpore les elements de transition au moyen de deux approches differentes –...