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Stacking faults in sic particles and their effect on the fracture behavior of a 15 Vol Pct SiC/6061-AI matrix composite

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Abstract

Mechanical tests and microstructural examinations performed on a SiC-particle-reinforced 6061-A1 matrix composite indicate that particle cracking during mechanical testing significantly affects the failure mechanisms of the composite. Microcracks were observed to nucleate and propagate on stacking faults and interfaces between the 4H (or 3C) and 6H hexagonal phases within the SiC particle reinforcements. These planar defects were the predominant defects seen in the SiC particles. Partial dislocations, having a 1/3 (10άrc10) Burgers vector, were also observed bounding the stacking faults in the reinforcement phase.

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Authors and Affiliations

  1. Los Alamos National Laboratory, 87545, Los Alamos, NM

    S. G. Song (Postdoctoral Research Associate), R. U. Vaidya (Postdoctoral Research Associate), A. K. Zurek (Technical Staff Member) & G. T. Gray (Technical Staff Member)

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  1. S. G. Song
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  2. R. U. Vaidya
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  3. A. K. Zurek
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  4. G. T. Gray
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Song, S.G., Vaidya, R.U., Zurek, A.K. et al. Stacking faults in sic particles and their effect on the fracture behavior of a 15 Vol Pct SiC/6061-AI matrix composite. Metall Mater Trans A 27, 459–465 (1996). https://doi.org/10.1007/BF02648423

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