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The Effect of Ni and Zr Additions on the Tensile Properties of Isothermally Aged Ai–Si–Cu–Mg Cast Alloys

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Abstract

The present study was carried out to investigate the effects of Ni and Zr additions, individually or in combination, on the room-temperature tensile properties of 354 casting alloy (Al–9wt%Si–1.8wt%Cu–0.5wt%Mg) which was isothermally treated at temperatures in the range of 155–350 °C and aging times up to 1000 h. Tensile tests were carried out in the as-cast, solution heat-treated, and aged conditions using different aging times up to 1000 h. Quality charts were used as an evaluation tool for selecting the optimum conditions to achieve superior tensile properties and optimum quality in 354-type alloys. Zirconium reacts only with Ti, Si, and Al to form (Al,Si)2(Zr,Ti), (Al,Si)3(Zr,Ti), and Al3Zr phases. The beneficial effects of Zr and Ti additions appear in the refining of the α-Al grain size which reduces the size of the Al2Cu and α-Fe particles. Tensile test results at ambient temperature show a slight increase in alloys with Zr and Zr/Ni additions, particularly at aging temperatures above 240 ºC. It is suggested that the maximum obtainable quality index values by means of heat treatment are the difference between the quality index values for the as-cast and solution heat treatment conditions.

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Authors and Affiliations

  1. Facultad de Ingeniería Mecánica y Eléctrica, Universidad Autónoma de Nuevo Leon, Nicolás de los Garza, Mexico

    J. Hernandez-Sandoval

  2. Département des Sciences appliquées, Université du Québec à Chicoutimi, Chicoutimi, Canada

    G. H. Garza-Elizondo, A. M. Samuel & F. H. Samuel

  3. Département PEC, Université Française d’Egypte, Ville Shorouk, Le Caire, Egypt

    M. H. Abdelaziz

  4. General Motors Materials Engineering, Warren, MI, 48340, USA

    H. W. Doty

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  1. J. Hernandez-Sandoval
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  2. G. H. Garza-Elizondo
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  4. A. M. Samuel
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Correspondence to F. H. Samuel.

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Hernandez-Sandoval, J., Garza-Elizondo, G.H., Abdelaziz, M.H. et al. The Effect of Ni and Zr Additions on the Tensile Properties of Isothermally Aged Ai–Si–Cu–Mg Cast Alloys. Inter Metalcast 16, 435–457 (2022). https://doi.org/10.1007/s40962-021-00615-6

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