Thickness of chill zone formed on ADC 12 alloy die castings

DOI 1 Citations

Bibliographic Information

Other Title
  • ADC12合金ダイカストに生成したチル層の厚さについて
  • Studies on solielified structure and properties of Al-Si-Cu alloy die castings (4th report)
  • Al-Si-Cu合金ダイカストの凝固組織と物性値に関する研究(第4報)

Abstract

It has been difficult to determine the chill zone formed on aluminum alloy die castings by conventional or metallographic method. This paper describes a tentative method to determine it in Al-12Si-Cu alloy (JIS ADC 12) die castings.<br>The percentage of crystallized α-phase area rapidly increased from the surface to the depth of 0.5mm being inversely proportional to the micro-Vicker's hardness. The surface layer having micro-Vicker's hardness more than 105, corresponding the α percentage less than 60%, was defined as a chill zone.<br>A thinner chill zone was formed on the castings having a heavy section. The thickness of chill zone on die castings of 10mm in thickness was as little as less than 50% of that in castings of 2mm in thickness. Casting factors such as metal temperature, injection pressure, gate velocity and filling ratio in the sleeve had little effects on the formation of chill zones. Only the die temperature had an effect with a significance level of 99% on the basis of variance analysis. The thickness of chill zone had a correlation to tensile strength and elongation. An inverse correlation was found, however, when the gate velocity was changed.

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Details 詳細情報について

  • CRID
    1390001206339302016
  • NII Article ID
    130004075422
  • DOI
    10.2464/jilm.21.379
  • ISSN
    18808018
    04515994
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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