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Development of new Al-Cu-Si alloys for high temperature performance

    Samuel A. Awe Salem Seifeddine Anders E. W. Jarfors Young. C. Lee Arne K. Dahle

Advanced Materials Letters, 2017, Volume 8, Issue 6, Pages 695-701
10.5185/amlett.2017.1471

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Abstract

In a quest for developing new lightweight metal alloys that can perform excellently at elevated-temperatures (from 300°C to 400 °C), a ternary eutectic Al-Cu-Si alloy was exploited to gain a deeper understanding of the alloy system and its suitability for high temperature applications. The studied alloys, with chemical composition of Al-27%Cu-5%Si (by weight percent) with Ni addition in the range of 0 to 1.5%wt, were cast in a rapid solidification casting technique. The solidification characteristics of the alloy was studied using the Thermo-Calc software. Microstructures were characterized in a scanning electron microscope coupled with energy dispersive spectrometry (SEM-EDS). Finally, the elevated-temperature tensile properties of the alloys were investigated. Comparing the microstructures and mechanical properties of the Al-Cu-Si(-Ni) alloys with conventional A319 Al- alloy, the refined microstructure with dispersed Ni intermetallic particles formed in the as-cast Al-Cu-Si(-Ni) alloys delivers improved elevated temperature properties. In particular, the yield strength and ultimate tensile strength of the new alloy with 1.5% Ni at 400˚C were observed to be 220% and 309% higher, respectively, than for conventional A319 reference alloy.
Keywords:
    Eutectic composite structure casting solidification elevated temperature performance thermo calc tensile properties
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(2017). Development of new Al-Cu-Si alloys for high temperature performance. Advanced Materials Letters, 8(6), 695-701. doi: 10.5185/amlett.2017.1471
Samuel A. Awe; Salem Seifeddine; Anders E. W. Jarfors; Young. C. Lee; Arne K. Dahle. "Development of new Al-Cu-Si alloys for high temperature performance". Advanced Materials Letters, 8, 6, 2017, 695-701. doi: 10.5185/amlett.2017.1471
(2017). 'Development of new Al-Cu-Si alloys for high temperature performance', Advanced Materials Letters, 8(6), pp. 695-701. doi: 10.5185/amlett.2017.1471
Development of new Al-Cu-Si alloys for high temperature performance. Advanced Materials Letters, 2017; 8(6): 695-701. doi: 10.5185/amlett.2017.1471
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