Fatigue Crack Propagation In Al-Si Alloy Castings

Toshiro Kobayashi, Mitsuo Niinomi, Kouichi Ikeda

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Permanent mold castings of high purity binary Al-Si alloys (Si: 3, 7, 12 and 20) were tested. The fatigue crack propagation in as-cast alloys in the Paris regime is seriously influenced by Si concentration less than eutectic composition. Al-20%Si alloy is less stable in fatigue crack propagation than the other alloys. Solution treated high Si alloys show slower rates of fatigue crack propagation than as-cast alloys. The fact depends on strengthening of the matrix, forming of eutectic Si particles into spheres and on increase in crack closure. The resistance to fatigue crack initiation is improved by high content of Si in as-cast alloys and by solution treating.

Original languageEnglish
Pages (from-to)824-830
Number of pages7
Journaljournal of japan institute of light metals
Volume37
Issue number12
DOIs
Publication statusPublished - 1987

Keywords

  • Al~
  • Si casting alloys fatigue cracks Paris law crack closure fatigue threshold

ASJC Scopus subject areas

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

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