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Deformation and fracture of a particle-reinforced aluminum alloy composite: Part I. Experiments

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Abstract

Mechanical tests were performed on a powder-metallurgically processed 7093/SiC/15p discontinuously reinforced aluminum (DRA) composite in different heat-treatment conditions, to determine the influence of matrix characteristics on the composite response. The work-hardening exponent and the strain to failure varied inversely to the strength, similar to monolithic Al alloys, and this dependence was independent of the dominant damage mode. The damage consisted of SiC particle cracks, interface and near-interface debonds, and matrix rupture inside intense slip bands. Fracture surfaces revealed particle fracture-dominated damage for most of the heat-treatment conditions, including an overaged (OA) condition that exhibited a combination of precipitates at the interface and a precipitate-free zone (PFZ) in the immediate vicinity. In the highly OA conditions and in a 450°C as-rolled condition, when the composite strength became less than 400 MPa, near-interface matrix rupture became dominant. A combination of a relatively weak matrix and a weak zone around the particle likely contributed to this damage mode over that of particle fracture. Fracture-toughness tests show that it is important to maintain a proper geometry and testing procedure to obtain valid fracture-toughness data. Overaged microstructures did reveal a recovery of fracture toughness as compared to the peak-aged (PA) condition, unlike the lack of toughness recovery reported earlier for a similar 7XXX (Al-Zn-Cu-Mg)—based DRA. The PA material exhibited extensive localization of damage and plasticity. The low toughness of the DRA in this PA condition is explored in detail, using fractography and metallography. The damage and fracture micromechanisms formed the basis for modeling the strength, elongation, toughness, and damage, which are described in Part II of this work.

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Authors and Affiliations

  1. UES, Inc., 45432, Dayton, OH

    A. B. Pandey (Senior Scientist) & B. S. Majumdar (Senior Scientist)

  2. Air Force Research Laboratory, Materials and Manufacturing Direction, Metal Matrix Composites, Wright-Patterson Air Force Base, 45433, OH

    D. B. Miracle (Group Leader)

Authors
  1. A. B. Pandey
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  2. B. S. Majumdar
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  3. D. B. Miracle
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Additional information

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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Pandey, A.B., Majumdar, B.S. & Miracle, D.B. Deformation and fracture of a particle-reinforced aluminum alloy composite: Part I. Experiments. Metall Mater Trans A 31, 921–936 (2000). https://doi.org/10.1007/s11661-000-1011-4

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