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論文

High-density nanoprecipitates and phase reversion via maraging enable ultrastrong yet strain-hardenable medium-entropy alloy

Kwon, H.*; Sathiyamoorthi, P.*; Gangaraju, M. K.*; Zargaran, A.*; Wang, J.*; Heo, Y.-U.*; Harjo, S.; Gong, W.; Lee, B.-J.*; Kim, H. S.*

Acta Materialia, 248, p.118810_1 - 118810_12, 2023/04

https://doi.org/10.1016/j.actamat.2023.118810
 被引用回数：0 パーセンタイル：0.01(Materials Science, Multidisciplinary)

Maraging steels, known for ultrahigh strength and good fracture toughness, derive their superior properties from lath martensite structure with high-density nanoprecipitates. In this work, we designed a novel Fe-based medium-entropy alloy with a chemical composition of Fe$$_{60}$$Co$$_{25}$$Ni$$_{10}$$Mo$$_5$$ in atomic% by utilizing the characteristics of the maraging steels. By a single-step aging of only 10 min at 650 $$^{circ}$$C, the alloy showed microstructures consisting of a very high number density of (Fe, Co, Ni)$$_7$$Mo$$_6$$-type nanoprecipitates in lath martensite structure and reverted FCC phase, which led to ultrahigh yield strength higher than 2 GPa. This work demonstrates a novel direction to produce strong and ductile materials by expanding the horizons of material design with the aid of high-entropy concept and overcoming the limits of conventional materials.

論文

Synthesis and characterization of iodovanadinite using PdI$$_{2}$$, an iodine source for the immobilisation of radioiodine

Johnstone, E. V.*; Bailey, D. J.*; Lawson, S.*; Stennett, M. C.*; Corkhill, C. L.*; Kim, M.*; Heo, J.*; 松村 大樹; Hyatt, N. C.*

RSC Advances (Internet), 10(42), p.25116 - 25124, 2020/07

https://doi.org/10.1039/D0RA04114A
 被引用回数：2 パーセンタイル：12.25(Chemistry, Multidisciplinary)

The synthesis of a palladium-containing iodovanadinite derivative, hypothetically "PdPb$$_{9}$$(VO$$_{4}$$)$$_{6}$$I$$_{2}$$", was attempted using PdI$$_{2}$$ as a source of iodine in searching for a novel waste form for radioiodine. The resulting products were characterized using X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray analysis, IR spectroscopy, thermal analysis and Pd K XANES. Results showed that PdI$$_{2}$$ can function as a sacrificial iodine source for the formation of iodovanadinite, prototypically Pb$$_{10}$$(VO$$_{4}$$)$$_{6}$$I$$_{2}$$, however, the incorporation of Pd into this phase was not definitively observed. Overall, the key novelty and importance of this work is in demonstrating a method for direct immobilisation of undissolved PdI$$_{2}$$ from nuclear fuel reprocessing, in a composite wasteform in which I-129 is immobilised within a durable iodovandinite ceramic, encapsulating Pd metal.

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