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Open AccessArticle

Quality Index Charts of Al-Si-Mg Semi Solid Alloys Subjected to Multiple Temperatures Aging Treatments and Different Quenching Media

1
Applied Sciences, University of Quebec at Chicoutimi, Chicoutimi, QC G7H2B1, Canada
2
Department of Metallurgy, Faculty of Engineering, Cairo University, Giza 12613, Egypt
*
Author to whom correspondence should be addressed.
Materials 2019, 12(11), 1834; https://doi.org/10.3390/ma12111834
Received: 8 May 2019 / Revised: 31 May 2019 / Accepted: 4 June 2019 / Published: 6 June 2019
(This article belongs to the Special Issue Microstructure and Mechanical Properties of Metals and Alloys)
The use of quality index charts is considered as an effective mean for evaluating the mechanical performance of Aluminum alloys for industrial engineering applications. The current study was carried out to investigate the influences of multiple-interrupted temperatures aging and quenching media (water versus air) on the quality index performance and precipitations evolution of A357 Aluminum semi solid alloys. Regarding the lack of similar investigations applied on such alloys, the quality index charts were generated for Al-Si-Mg semi solid castings based on its tensile properties. These charts are used to determine the quality index, in MPa, as a simple mean for compromising the strength and ductility together in one value using the Drouzy model. The multiple temperatures aging cycles were applied to improve the quality index values of Al-Si-Mg semi solid alloys for enhancing its characteristic and performance to resist the mechanical failures relating to automotive dynamic parts. The evolution of Mg2Si hardening precipitates, formed for specific thermal aging cycles, was investigated using transmission electron microscopy (TEM). The results obtained in this work revealed that the optimum quality index values were obtained by the application of T6-thermal under-aging treatment cycles. The regression models, using a statistical design of experiments, indicated that the optimum strength and high-quality index values were obtained by the application of interrupted thermal aging cycles, mainly C2,3-T6/T4/T7 conditions. View Full-Text
Keywords: quality index charts; aluminum semi solid alloys; multi-temperatures aging; statistical design of experiments; TEM quality index charts; aluminum semi solid alloys; multi-temperatures aging; statistical design of experiments; TEM
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MDPI and ACS Style

Ragab, K.A.; Bouazara, M.; Chen, X.-G. Quality Index Charts of Al-Si-Mg Semi Solid Alloys Subjected to Multiple Temperatures Aging Treatments and Different Quenching Media. Materials 2019, 12, 1834.

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