The mechanical properties of tungsten grown by chemical vapour deposition
| Autor: | A. Giannattasio, Peter D. Nellist, John D. Murphy, Zhongwen Yao, C. J. D. Hetherington, Steve G. Roberts |
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| Rok vydání: | 2009 |
| Předmět: |
Nuclear and High Energy Physics
Chemistry Metallurgy Mineralogy Concentration effect chemistry.chemical_element Chemical vapor deposition Atmospheric temperature range Strain rate Tungsten equipment and supplies Brittleness Nuclear Energy and Engineering Materials Sciences General Materials Science Grain boundary Crystallite |
| Zdroj: | Journal of Nuclear Materials. :583-586 |
| ISSN: | 0022-3115 |
| DOI: | 10.1016/j.jnucmat.2008.12.182 |
| Popis: | The mechanical properties of polycrystalline tungsten grown by chemical vapour deposition (CVD) have been investigated. Fracture tests were performed on the material over the 24-967 °C temperature range at a low strain rate. The material was found to be brittle or semi-brittle across the entire temperature range investigated. This behaviour differs significantly from that previously found in conventionally-grown polycrystalline tungsten, which, under similar experimental conditions, is found to be ductile above approximately 120 °C. Energy dispersive X-ray analysis indicates that in the CVD tungsten, there is a significant concentration of fluorine at grain boundaries. It is therefore suggested that fluorine segregation to grain boundaries is responsible for the increased brittleness observed in the CVD tungsten. |
| Databáze: | OpenAIRE |
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