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The interactive role of inclusions and SiC reinforcement on the high-cycle fatigue resistance of particle reinforced metal matrix composites

Metallurgical and Materials Transactions A volume 31, pages 951–957 (2000)Cite this article

Abstract

The effect of intermetallic inclusions on the fatigue crack initiation and growth in 2080 Al alloy and 2080/SiC p composites was investigated. Using surface replication, it was determined that, in the high-cycle fatigue region, life is dominated by the initiation process. It was also determined that the majority of initiation sites were associated with intermetallic inclusions. While 2080/SiC/20 p showed a definitive relationship between inclusion size and fatigue life, i.e., a higher inclusion size resulted in lower fatigue life, there was no correlation in 2080/SiC/30 p . This was attributed to more of the load being shared by the higher volume fraction of SiC particles and smaller average inclusion sizes in the latter composite. A conceptual model is proposed that accounts for these observations and qualitatively shows the effect of reinforcement on stress enhancement in near-surface inclusions.

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Authors and Affiliations

  1. Department of Chemical, Bio, and Materials Engineering, Arizona State University, 85287-6006, Tempe, AZ

    N. Chawla (Assistant Professor)

  2. Physics Department, Ford Research Laboratory, Ford Motor Co., 48121-2053, Dearborn, MI

    L. C. Davis (Manager)

  3. Scientific Research Laboratory, Ford Motor Co., 48121-2053, Dearborn, MI

    J. E. Allison (Senior Technical Staff Specialist)

  4. College of Engineering, University of Michigan, 48109, MI, Ann Arbor

    J. W. Jones (Associate Dean for Undergraduate Education)

Authors
  1. N. Chawla
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  2. C. Andres
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  3. L. C. Davis
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  4. J. W. Jones
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  5. J. E. Allison
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Additional information

N. CHAWLA, formerly Research Fellow, Department of Materials Science and Engineering, University of Michigan

C. ANDES is former Research Fellow, Department of Materials Science and Engineering, University of Michigan.

This article is based on a presentation made in the Symposium “Mechanisms and Mechanics of Composites Fracture” held October 11–15, 1998, at the TMS Fall Meeting in Rosemont, Illinois, under the auspices of the TMS-SMD/ASM-MSCTS Composite Materials Committee.

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Chawla, N., Andres, C., Davis, L.C. et al. The interactive role of inclusions and SiC reinforcement on the high-cycle fatigue resistance of particle reinforced metal matrix composites. Metall Mater Trans A 31, 951–957 (2000). https://doi.org/10.1007/s11661-000-1013-2

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  • DOI: https://doi.org/10.1007/s11661-000-1013-2

Keywords

  • Fatigue
  • Material Transaction
  • Fatigue Crack
  • Fatigue Life
  • Crack Initiation