Microstructural effects on short fatigue crack propagation in cast Al-Si alloys

Peirong Ren, Philip J. Withers, Zhengxing Zuo, Huihua Feng, Weiqing Huang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The role of microstructure on the short fatigue crack behaviour of cast Al-Si alloy under high cycle loading conditions is investigated by tracking the progress of cracks through fine, medium and coarse microstructured samples. Generally, in the early stage of crack growth, short cracks mainly grow transgranularly, with cracks growth close to low index crystallographic planes (mainly {1 0 0}) in some grains and frequently inhibited at grain boundaries. In the late stage, the crack growth mode gradually shifts from crystallographic stage-I to non-crystallographic stage-II. The short cracks grow faster and fluctuate significantly according to local microstructure. Our results show that finer microstructures offer greater crack nucleation and propagation resistance.

Original languageEnglish
Article number107788
JournalInternational Journal of Fatigue
Volume175
DOIs
Publication statusPublished - Oct 2023

Keywords

  • Cast Al-Si alloy
  • Crack behaviour
  • Microstructure
  • Short fatigue crack

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