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Improvement of the Mechanical Properties of Al-7Si-0.35Mg Cast Alloys by the Optimised Combination of Alloying Elements and Heat Treatment
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  • Journal title : Journal of Korea Foundry Society
  • Volume 36, Issue 1,  2016, pp.1-9
  • Publisher : The Korean Foundrymens Society
  • DOI : 10.7777/jkfs.2016.36.1.1
 Title & Authors
Improvement of the Mechanical Properties of Al-7Si-0.35Mg Cast Alloys by the Optimised Combination of Alloying Elements and Heat Treatment
Cho, Young-Hee; Lee, Jung-Moo; Jin, Jin-Woo; Jung, Jae-Gil;
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 Abstract
Improvement of the mechanical properties of a commercial aluminium casting alloy, A356, was achieved through an optimised combination of alloying elements, modification, and heat treatment. 0.7 wt.% Cu and an additional 0.2 wt.% Mg were added to an Al-7Si-0.35Mg alloy for strengthening at both room and elevated temperatures, whilst a subsequent decrease in the ductility was compensated for by the modification of eutectic Si by Sr addition at a level of up to 110 ppm. It was found that the dissolution of Cu-rich or Mg-rich phases could be maximised by solid-solutionising an alloy with 40 ppm Sr at , increasing the tensile and yield strengths to 350 MPa and 297 MPa, respectively, with a reasonably high strain of 5% after peak-aging at . Further addition of Sr up to 110 ppm is, however, more likely to interfere with the dissolution of the Cu-rich or Mg-rich phases during solid solution treatment, resulting in a slight decrease in both tensile and yield strengths at room temperature. Besides the Cu addition, such undissolved phases, on the other hand, may contribute to elevated temperature strength at .
 Keywords
Aluminium foundry alloys;Modification;Heat treatment;Microstructure;Mechanical properties;
 Language
Korean
 Cited by
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