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Combining the K-bubble strengthening and Y-doping: Microstructure, mechanical/thermal properties, and thermal shock behavior of W-K-Y alloys.
- Source :
-
International Journal of Refractory Metals & Hard Materials . Feb2022, Vol. 103, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
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Abstract
- Nano‑potassium bubble strengthened tungsten (W-K) alloy with excellent overall performance has been proven to be one of the most desirable plasma facing materials (PFMs). However, some key properties, e.g., thermal heat resistance, ductile-brittle transition temperature (DBTT), strength and toughness need to be further improved to meet the requirements of fusion reactor. Herein, pure yttrium (Y) was doped in W-K alloy to achieve multiple strengthening effects. The grains of W-K alloy have been significantly refined, and the tensile strength was improved along with the introducing of Y. Thermal shock cracking threshold has increased to exceed 0.62 GW/m2. Interestingly, the existing form and size of the precipitates differed with the change of doping amount, leading to the nonlinear evolution of DBTT. The W-K alloy with 0.1 wt%-Y doping content (W-K-0.1Y) showed the best match of strength and toughness. Furthermore, coupled with relatively good thermal conductivity, W-K-0.1Y alloy displayed prominent thermal shock resistance. This work may pave a way for designing PFMs with higher performance. • Pure yttrium (Y) was doped in W-K alloy to realize multiple strengthening effects. • The grains of W-K alloy were significantly refined by Y doping. • The existing form of the precipitates differed with the change of doping content. • The DBTT of W-K-0.1Y alloy has been reduced to ~200 °C. • The thermal shock cracking threshold of W-K-0.1Y alloy exceeded 0.62 GW/m2. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02634368
- Volume :
- 103
- Database :
- Academic Search Index
- Journal :
- International Journal of Refractory Metals & Hard Materials
- Publication Type :
- Academic Journal
- Accession number :
- 154857932
- Full Text :
- https://doi.org/10.1016/j.ijrmhm.2021.105739