The Effects of Atmosphere on the Sintering of Ultrafine-Grained Tungsten with Ti
| Autor: | Zhigang Zak Fang, Huan Zhang, Chai Ren, Mark Koopman |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
020502 materials Diffusion Metallurgy General Engineering Sintering chemistry.chemical_element 02 engineering and technology Tungsten 021001 nanoscience & nanotechnology Grain size Grain growth Brittleness 0205 materials engineering chemistry Nano General Materials Science 0210 nano-technology Ductility |
| Zdroj: | JOM. 68:2864-2868 |
| ISSN: | 1543-1851 1047-4838 |
| DOI: | 10.1007/s11837-016-2121-9 |
| Popis: | Tungsten (W) is a brittle material at room temperature making it very difficult to fabricate. Although the lack of ductility remains a difficult challenge, nano-sized and ultrafine-grained (UFG) structures offer the potential to overcome tungsten’s room-temperature brittleness. One way to manufacture UFG W is to compact and sinter nano-sized W powder. It is challenging, however, to control grain growth during sintering. As one method to inhibit grain growth, the effect of Ti-based additives on the densification and grain growth of nano-W powders was investigated in this study. Addition of 1% Ti into tungsten led to more than a 63% decrease in average grain size of sintered samples at comparable density levels. It was found that sintering in Ar yielded a finer grain size than sintering in H2 at similar densities. The active diffusion mechanisms during sintering were different for W-1% Ti nano powders sintered in Ar and H2. |
| Databáze: | OpenAIRE |
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