Mechanism of fracture of dispersion-strenghthened tungsten
| Autor: | I. V. Gridneva, S. I. Chugunova, A. B. Ol'shanskii, Yu.V. Milman, N. P. Korzhova |
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| Rok vydání: | 1986 |
| Předmět: |
Materials science
Metallurgy Alloy Metals and Alloys Transgranular fracture chemistry.chemical_element Fracture mechanics Tungsten engineering.material Condensed Matter Physics Intergranular fracture Brittleness chemistry Mechanics of Materials Materials Chemistry Ceramics and Composites engineering Grain boundary Microvoid coalescence |
| Zdroj: | Soviet Powder Metallurgy and Metal Ceramics. 25:557-560 |
| ISSN: | 0038-5735 |
| DOI: | 10.1007/bf00792359 |
| Popis: | 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 (TBru1), tough fracture through the body of the grain is observed in the range from 1000 (TBru2) to 1600°C, and at 1800°C tough intergranular fracture commences. The cold-brittleness points of the dispersion-strengthened tungsten alloy are lower (TBru1 by 100 and TBru1 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. |
| Databáze: | OpenAIRE |
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