Journal
METALS
Volume 12, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/met12111855
Keywords
amorphous powder; gas atomization; crystallization; shielding performance
Funding
- Innovation Fund of GRIMAT Engineering Institute Co., Ltd. [57272003]
- GRIMAT Engineering Institute Co., Ltd.
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This study systematically investigated the effects of master alloy composition and annealing temperature on the amorphization and crystallization behavior of Fe-W-B powders. The results showed that master alloys with high content of W and B yielded amorphous Fe-W-B powders, which exhibited superior shielding performance for gamma-rays and neutrons compared to iron.
In this work, the effects of master alloy composition and annealing temperature on the amorphization and crystallization behavior of Fe-W-B powders prepared by gas atomization using compacts of Fe, W and B powder mixture were systematically studied. The results show that only the master alloy with high content of W (19.9 at.%) and B (13.6 at.%) of the six alloys studied yielded amorphous Fe-W-B powders. The alloying elements W and B are believed to have a glass-forming ability (GFA)-enhancing effect, which together with the high cooling rate of gas atomization leads to the formation of amorphization. The difference in the average particle size of 3-10 mu m for the six atomized powders indicates that the master alloys with different W and B contents have different superheat and melt viscosity at the same atomization temperature. The Fe-W-B amorphous powder is structurally stable within 600 degrees C and crystallizes from the edge of the particles when the temperature increases to 700 degrees C, and its crystalline precipitates include alpha-Fe, FeWB and Fe7W6. The nuclear shielding tests and Monte Carlo N Particle Transport Code (MCNP) calculated results revealed that the Fe-W-B amorphous powder has a much better shielding performance for gamma-rays and neutrons than that of iron. This work provides an efficient strategy for fabricating Fe-W-B amorphous powder with promising nuclear shielding potential and sheds light on the crystallization behaviors of this alloy.
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