Processing and consolidation of copper/tungsten
| Autor: | Eric L. Tegtmeier, Ching-Fong Chen, Reeju Pokharel, Ricardo A. Lebensohn, Michael J. Brand, Timothy Lee Ickes, David E. Dombrowski, Bjørn Clausen |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science Hydrogen Mechanical Engineering Metallurgy Composite number chemistry.chemical_element 02 engineering and technology Tungsten 021001 nanoscience & nanotechnology Hot pressing 01 natural sciences Copper Grain size chemistry Mechanics of Materials 0103 physical sciences Ultimate tensile strength General Materials Science 0210 nano-technology Copper–tungsten |
| Zdroj: | Journal of Materials Science. 52:1172-1182 |
| ISSN: | 1573-4803 0022-2461 |
| Popis: | We developed a copper/tungsten (Cu/W) composite for mesoscale Materials Science applications using the novel High-Energy Diffraction Microscopy (HEDM) technique. Argon-atomized copper powder was selected as the starting raw powder and screened to remove the extremely large particle fraction. Tungsten particles were collected by milling and screening the −325 mesh tungsten powder between 500 and 635 mesh sieves. Hot pressing of screened Cu powder was performed at 900 °C in Ar/4 %H2 atmosphere. XRD and ICP results show that the hot-pressed Cu sample consists of about 5 vol% Cu2O, which is caused by the presence of oxygen on the surface of the starting Cu powder. Hot pressing the copper powder in a pure hydrogen atmosphere was successful in removing most of the surface oxygen. This process was also implemented for hot pressing the Cu/W composite. The density of the Cu/W composites hot pressed at 950 °C in pure hydrogen was about 94 % of the theoretical density (TD). The hot-pressed Cu/W composites were further hot isostatic pressed at 1050 °C in argon atmosphere, which results in 99.6 % of the TD with the designed Cu grain size and W particle distribution. Tensile specimens with D-notch were machined using the wire EDM method. The processing and consolidation of these materials will be discussed in detail. The HEDM images are also showed and discussed. |
| Databáze: | OpenAIRE |
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