Effects of doping route on microstructure and mechanical properties of W−1.0wt.%La2O3 alloys
| Autor: | Ying Yu, Xing-yu Li, Zheng Chen, Junjun Yang, Mingli Qin, Gang Chen, Qu Xuanhui, Xiao-dong Mu, Lin Zhang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Alloy Doping Metals and Alloys chemistry.chemical_element Sintering 02 engineering and technology engineering.material Tungsten 021001 nanoscience & nanotechnology Geotechnical Engineering and Engineering Geology Condensed Matter Physics Microstructure 01 natural sciences Indentation hardness Grain size chemistry 0103 physical sciences Materials Chemistry engineering Grain boundary Composite material 0210 nano-technology |
| Zdroj: | Transactions of Nonferrous Metals Society of China. 30:3296-3306 |
| ISSN: | 1003-6326 |
| Popis: | A comparative study was conducted by using solution combustion synthesis with three different doping routes (liquid−liquid (WL10), liquid−solid (WLNO) and solid−solid (WLO)) to produce nanoscale powders and further fabricate the ultrafine-grained W−1.0wt.%La2O3 alloys by pressureless sintering. Compared with pure tungsten, W−1.0wt.%La2O3 alloys exhibit ultrafine grains and excellent mechanical properties. After sintering, the average grain size of the WLO sample is larger than that of WL10 and WLNO samples; the microhardness values of WL10 and WLNO samples are similar but larger than the value of WLO sample. The optimized La2O3 particles are obtained in the WL10 sample after sintering at 1500 °C with the minimum mean size by comparing with WLNO and WLO samples, which are uniformly distributed either at grain boundaries or in the grain interior with the sizes of (57±29.7) and (27±13.1) nm, respectively. This study exhibits ultrafine microstructure and outperforming mechanical properties of the W−1.0wt.%La2O3 alloy via the liquid−liquid doping route, as compared with conventionally-manufactured tungsten materials. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect