Effect of chemical composition on the microstructure and hardness of Al-Cu-Fe alloy

M. A. Suárez, R. Esquivel, J. Alcántara, H. Dorantes, J. F. Chávez

Research output: Contribution to journalArticle

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Abstract

Four Al-Cu-Fe alloys with compositions; a) Al 65 Cu 20 Fe 15 , b) Al 64 Cu 22.5 Fe 13.5 , c) Al 61 Cu 26 Fe 13 and d) Al 62 Cu 25.5 Fe 12.5 , where the icosahedral phase is present, have been experimentally studied in both as-cast and annealed conditions in order to investigate the effect of chemical composition on the percentage of icosahedral phase and the changes in hardness of the alloy and each phase. It was found that the a) Al 65 Cu 20 Fe 15 and b) Al 64 Cu 22.5 Fe 13.5 alloys, which present the highest Fe content, showed the largest amount of λ-Al 13 Fe 4 phase as well as the highest hardness in all phases. In contrast, the same alloys developed the lowest amount of icosahedral phase after heat treatment. The c) Al 61 Cu 26 Fe 13 and d) Al 62 Cu 25.5 Fe 12.5 alloys had a better response to heat treatment, reaching amounts of icosahedral phase up to 87% and 99% respectively. The hardness of phases after heat treatment increased with respect to alloys in as- cast condition, the hardness of icosahedral phase increased between 20% and 25%, while the hardness of λ-Al 13 Fe 4 phase increased 9%. The icosahedral phase of annealed a) Al 65 Cu 20 Fe 15 alloy was the toughest with a hardness value of 844HV. © 2011 Elsevier Inc.
Original languageAmerican English
Pages (from-to)917-923
Number of pages7
JournalMaterials Characterization
DOIs
StatePublished - 1 Sep 2011

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