Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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PRECIPITAlON BEHAVIOR OF 8090 ALUMINIUM ALLOY BY HERMOMECANICAL AND DUPLEX AGING TREAMENT

가공열처리 및 2단시효처리에 의한 8090알루미늄 합금의 석출거동

  • Lee, Hag-Yong (Defence Quality Asurance Agency) ;
  • Kim, Sug-Woo (Dept. of Metallurgical Eng., Chonbuk National University) ;
  • Woo, Kee-Do (Dept. of Metallurgical Eng., Chonbuk National University)
  • 이학용 (국방부 품질관리소) ;
  • 김석원 (전북대학교 공과대학 금속공학과) ;
  • 우기도 (전북대학교 공과대학 금속공학과)
  • Published : 1994.12.31
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Abstract

The effects of thermomechanical and duplex aging treatment on precipitation behavior were investigated for the 8090 aluminium alloy by tensile test, hardness test, plane-strain fracture toughness test and electron microscope. Both pre-aging stretch and duplex aging with pre-aging stretch were effective to homogenize the distribution of S' phase in this alloys. The latter makes more homogeneous distribution of S' phase than that of the former, but the sizes of S' phase in both specimens are almost same. The size and distribution of 0' phase were not changed by thermomechanical or duplex aging treatment. The strength was increased by thermomechanical treatment, but the elongation was decreased. Duplex aging treatment couldn't change the strength and elongation. Pre-aging stretch and duplex aging with pre-aging stretch have same effect on the strength and elongation. The increase of strength by thermomechanical treatment in 8090 alumunium alloy was caused by homogeneously precipitated S' phase.

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