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      Effect of Dispersoids and Intermetallics on Hardening the Al-Si-Cu-Mg Cast Alloys

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          Abstract

          The principal aim of the present research work was to compare the role of dispersoids Al2O3 (∼15 μm average particle size) and SiC (∼15 μm average particle size) with that offered by Zr- and Ni-based intermetallics (∼35–70 μm average particle size) on the hardening of cast aluminum 354 alloy (9.1% Si, 0.12% Fe, 1.8% Cu, 0.008% Mn, 0.6% Mg, and 87.6% Al) at ambient temperature. There is no observable poisoning effect on the refinement of grain size after the addition of Zr to the alloys investigated in this study. The tensile test results were examined in light of the microstructural features of the corresponding alloy samples. The contribution of the added dispersoids or Ni and Zr alloying elements on the tensile properties of the 354 alloys was determined employing ∆P plots (where P = Property, UTS, YS, or %El), using the base alloy (in the as-cast condition) as a reference point. The tensile results were supported by investigating the precipitation-hardening phases using scanning and transmission electron microscopy as well as examining the fracture surfaces of selected conditions applying field emission scanning electron microscopy. The results show that, in all cases, Al2Cu phase is the main hardening agent. The contribution of about 1.5 vol% of SiC or Al2O3 to the strength of the base alloy is higher than that offered by Zr- and Ni-based intermetallics, under the same aging treatment.

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          Most cited references 11

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          Interpretation of tensile results by means of quality index and probable yield strength

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            Microstructure Design and Heat Treatment Selection for Casting Alloys Using the Quality Index

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              Evaluation of the effect of the Cr, Mo, V and W content in an Al-Si alloy used for pressure casting on its proof stress

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                Author and article information

                Contributors
                Journal
                Advances in Materials Science and Engineering
                Advances in Materials Science and Engineering
                Hindawi Limited
                1687-8442
                1687-8434
                May 10 2021
                May 10 2021
                : 2021
                : 1-15
                Affiliations
                [1 ]Facultad de Ingeniería Mecánica y Eléctrica, Universidad Autónoma de Nuevo Leon, San Nicolás de los Garza, Mexico
                [2 ]Département PEC, Université Française d’Egypte, El Shorouk, Le Caire, Egypt
                [3 ]Département des Sciences Appliquées, Université du Québec à Chicoutimi, Saguenay, Canada
                [4 ]General Motors Materials Engineering, Warren, MI 48340, USA
                Article
                10.1155/2021/9933168
                b9526e21-3824-47e4-82c6-c35c18ba8bb3
                © 2021

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