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Test temperature and strain rate effects on the properties of a tungsten heavy alloy

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Abstract

Liquid phase sintered tungsten heavy alloy specimens with a 90W-7Ni-3Fe composition were tested for temperature and strain rate effects on mechanical behavior. Both fracture stress and strain were measured for samples tested at 20, 300, or 600 °C, with crosshead speeds ranging from 0.004 to 400 mmJs in an argon atmosphere. Fracture surface examinations showed a dramatic increase in tungsten cleavage as the ductility increased. The effect of an increasing strain rate is a slight strength increase with a concomitant ductility decrease. Alternatively, higher test temperatures degrade strength with a nonsystematic effect on ductility; maximum ductility occurs at 300 °C and a slow strain rate. Surface oxidation at 600 °C greatly degrades ductility. The results are mathematically modeled using classic strain rate dependent equations.

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Authors and Affiliations

  1. Department of Materials Engineering, Rensselaer Polytechnic Institute, 12180-3590, Troy, NY

    A. Bose (Postdoctoral Researcher), D. Sims (Graduate Research Assistant) & R. M. German (Professor)

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  1. A. Bose
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  2. D. Sims
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  3. R. M. German
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Bose, A., Sims, D. & German, R.M. Test temperature and strain rate effects on the properties of a tungsten heavy alloy. Metall Trans A 19, 487–494 (1988). https://doi.org/10.1007/BF02649263

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