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Mechanism of fracture of dispersion-strenghthened tungsten

  • Powder Metallurgical Materials, Parts, and Coatings
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Soviet Powder Metallurgy and Metal Ceramics Aims and scope

Conclusions

In a dispersion-strengthened tungsten alloy fracture mechanisms change with rise in temperature in the same sequence as in unalloyed tungsten: quasibrittle cleavage at low temperatures is succeeded by partly tough fracture at 400°C (T u1Br ), tough fracture through the body of the grain is observed in the range from 1000 (T u2Br ) to 1600°C, and at 1800°C tough intergranular fracture commences. The cold-brittleness points of the dispersion-strengthened tungsten alloy are lower (T u1Br by 100 and T u1Br by 200°C) then those of unalloyed tungsten, while the temperature of transition to tough intergranular fracture is higher. As a result, the dispersion-strengthened alloy has a wider temperature range of tough transgranular fracture, with a larger value ofψ. The wider range of tough transgranular fracture in the dispersion-strengthened tungsten alloy may be linked with a tendency for microvoids to form in the material on the second-phase particles, as a consequence of which subsequent fracture occurs by a microvoid coalescence mechanism.

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Literature cited

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Authors and Affiliations

  1. Institute of Problems of Materials Science, Academy of Sciences of the Ukrainian SSR, Ukraine

    Yu. V. Mil'man, A. B. Ol'shanskii, I. V. Gridneva, N. P. Korzhova & S. I. Chugunova

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  1. Yu. V. Mil'man
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  2. A. B. Ol'shanskii
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  3. I. V. Gridneva
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  4. N. P. Korzhova
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  5. S. I. Chugunova
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Translated from Poroshkovaya Metallurgiya, No. 7(283), pp. 31–35, July, 1986.

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Mil'man, Y.V., Ol'shanskii, A.B., Gridneva, I.V. et al. Mechanism of fracture of dispersion-strenghthened tungsten. Powder Metall Met Ceram 25, 557–560 (1986). https://doi.org/10.1007/BF00792359

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  • DOI: https://doi.org/10.1007/BF00792359

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