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Deformation of whisker-reinforced metal-matrix composites under changing temperature conditions

  • Mechanical Behavior
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Abstract

A numerical technique for simulating the plastic response of whisker-reinforced metal-matrix composites under conditions of changing temperature and applied stress is developed. The model simulates an elastic-plastic (diffusion-controlled power-law creep) matrix and elastic whiskers, with variable whisker length and spacing. To test this model, the mechanical behavior of a metal-matrix composite of 6061 aluminum, reinforced with 20 vol pct discontinuous, oriented silicon carbide whiskers was studied under conditions of repeated temperature cycling and isothermal creep. The results of the thermal-cycling experiments are compared to those of the model. Both the experiments and the model demonstrate that the composite flw stress may be significantly reduced by thermal cycling (relative to isothermal, elevated temperature behavior) and that under appropriate conditions, the composite strain rate is proportional to the applied stress. Also, agreement between the experimental results and the first-principles model is very good in terms of both magnitude and trends, despite simplifications in the model.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Ohio State University, 43210, Columbus, OH

    Glenn S. Daehn (Assistant Professor)

  2. Departmento de Metalurgia Física, Centro Nacional de Investigaciones Metalúrgicas (CENIM), Madrid, Spain

    Gaspar González-Doncel (Research Scientist)

Authors
  1. Glenn S. Daehn
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  2. Gaspar González-Doncel
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Daehn, G.S., González-Doncel, G. Deformation of whisker-reinforced metal-matrix composites under changing temperature conditions. Metall Trans A 20, 2355–2368 (1989). https://doi.org/10.1007/BF02666670

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  • DOI: https://doi.org/10.1007/BF02666670

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