Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
권호 표지

Improvement of Fracture Toughness in 7XXX Series Aluminum Alloy Forings

7XXX계 알루미늄합금 단조재의 파괴인성 개선

  • Song, K.H. (Dept of Die and Mold Design, Juonju Technical College) ;
  • Lee, O.H. (Research Institute of Advanced Materials Development, Chunbuk Nat. Univ.)
  • 송기홍 (전주공업대학 금형설계과) ;
  • 이오연 (전북대학교 신소재개발연구소)
  • Published : 1998.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

The aim of this study is to investigate the effect of impurity level and fabrication processes on the strength, impact and fracture toughness of 7075, 7050 and 7175 aluminum alloy forgings. A specially processed 7175S-T74 aluminum forgings was superior to a conventionally processed 7075-T73, 7050-T74 and 7175-T74 aluminum forgings in both strength and toughness. The reduction of impurity level of iron and silicon has significantly diminished the size and volume fraction of second phase particles such as $Al_7Cu_2Fe$ and $Mg_2Si$. A further reduction of the amount of second phase particles has been observed by applying a special fabrication process. This phenomena result from the application of intermediate soaking at higher temperature and more sufficiant hot working temperature than that of a conventional processing.

Keywords