Improvement of Charpy impact strength of aluminum alloy die castings by PRPC process

Yoshihiko Hangai, Soichiro Kitahara, Kenji Sato, Osamu Kuwazuru, Takao Utsunomiya, Nobuhiro Yoshikawa

Research output: Contribution to journalArticlepeer-review


An eruption of porosities which degrade strength reliability of products, is inevitable in the die casting process. We have investigated PRPC (Porosity Reducing Post Compression) process of ADC12 aluminum alloy die castings to reduce inside porosity. In this study, a validity of PRPC process is demonstrated in terms of the Charpy impact strength. We ensure that the porosity ratio was considerably reduced by the PRPC process by means of X-ray CT observation. We conclude that the Charpy impact strength improves since the effective cross-sectional area of the specimen concerning fracture increases after PRPC process without any harmful influence. This conclusion is exemplified by the flat fracture surface of the specimen after PRPC process.

Original languageEnglish
Pages (from-to)915-916
Number of pages2
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Issue number6
Publication statusPublished - 2008 Jun
Externally publishedYes


  • Aluminum alloy
  • Charpy impact strength
  • Die casting
  • Fracture surface
  • Plastic working
  • Porosity
  • X-ray computed tomography

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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