Effect of Sr addition on fracture characteristics of high purity AI-Si-Mg type casting alloy

Toshiro Kobayashi, Mitsuo Niinomi, Michimasa Yamaoka, Toshihiro Harata, Mahmoud Fouad HAFIZ

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

The effect of strontium (Sr) modification on the fracture characteristics is investigated in high purity Al-Si-Mg typecasting alloy, AC4CH. The Charpy absorbed energy, static fracture toughness and dynamic fracture toughness of AC4CH are improved by the addition of Srassociated with the refinement and spheroidizing of needle like eutectic Si, which results in the relaxation of stress concentration of the eutectic Si. The cohesion of eutectic Si and porosity increase with increasing Sr addition. The larger size eutectic Si particles increase again with increasing Sr addition over 50ppm. These three factors seem to be the causes for decreasing dynamic toughness of AC4CH at 200ppm Sr addition comparing with 100ppm Sr addition.

Original languageEnglish
Pages (from-to)472-477
Number of pages6
Journaljournal of japan institute of light metals
Volume43
Issue number9
DOIs
Publication statusPublished - 1993 Feb

Keywords

  • Charpy absorbed energy
  • Sr modification
  • aluminum casting alloy AC4CH
  • dynamic fracture toughness

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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