Dynamic fracture toughness of 6061Al composites reinforced with SiC particulates

Lihe Qian, Toshiro Kobayashi, Hiroyuki Toda, Zhong Guang Wang

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Dynamic fracture toughness experiments were conducted at room temperature on 6061A1 alloy reinforced with 15 and 25% volume fractions of 9.5μm SiC particulates. The fracture properties were evaluated in terms of crack initiation toughness, crack propagation energy and total absorbed energy. The dynamic fracture of the unreinforced 6061 Al alloy was also studied as a comparison. The results of dynamic tests for both composites and matrix alloy are compared with their respective quasi-static cases. It is found that addition of SiC particles can drastically decrease fracture toughness of 6061 Al alloy at both quasi-static and dynamic loading rates. 15%SiCp composite shows a considerable increase in crack initiation toughness and a much greater increment of crack propagation energy in dynamic loading case compared with static loading case, whereas 25%SiCp composite exhibits a negligible increment of crack propagation energy and a reduced increase of crack initiation energy in dynamic case in contrast to 15%SiCp composite. Detailed SEM examination of the fracture surfaces and optical observation of microstructures beneath the fracture surfaces of both composites, combined with an in-situ SEM observation, were made to investigate the fracture processes of the composites.

Original languageEnglish
Pages (from-to)189-196
Number of pages8
JournalMaterials Science and Engineering A
Volume318
Issue number1-2
DOIs
Publication statusPublished - Nov 1 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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