Fatigue properties and fatigue fracture mechanisms of SiC whiskers or SiC particulate-reinforced aluminium composites

Chitoshi Masuda*, Yoshihisa Tanaka

*この研究の対応する著者

研究成果: Article査読

36 被引用数 (Scopus)

抄録

Fatigue properties and fracture mechanisms were examined for three commercially fabricated aluminium matrix composites containing SiC whiskers (SiCw) and SiC particles (SiCp) using a rotating bending test. The fatigue strengths were over 60% higher for SiCw/A2024 composites than that for the unreinforced rolled material, while for the SiCp/A357 composites, fatigue strengths were also higher than that for the unreinforced reference material. For the SiCp/A356 composites at a volume fraction of 20%, the fatigue strength was slightly higher than that of the unreinforced material. Fractography revealed that the Mode I fatigue crack was initiated by the Stage I mechanism for the SiCw/A2024 and SiCp/A357 composites, while for the SiCp/A356 composite, the fatigue crack initiated at the voids situated beneath the specimen surfaces. On the other hand, the fatigue crack propagated to the whisker/matrix interface following the formation of dimple patterns or the formation of striation patterns for SiCw/A2024 composites, while for the SiCp/A356 and SiCp/A357 composites the fatigue crack propagated in the matrix near the crack origin and striation patterns were found. Near final failure, dimple patterns, initiated at silicon carbide particles, were frequently observed. Mode I fatigue crack initiation and propagation models were proposed for discontinuous fibre-reinforced aluminium composites. It is suggested that the silicon carbide whiskers or particles would have a very significant effect on the fatigue crack initiation and crack propagation near the fatigue limit.

本文言語English
ページ(範囲)413-422
ページ数10
ジャーナルJournal of Materials Science
27
2
DOI
出版ステータスPublished - 1992 1月
外部発表はい

ASJC Scopus subject areas

  • 凝縮系物理学
  • 電子材料、光学材料、および磁性材料
  • 材料科学(全般)

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