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Journal Articles

Ag segregation and interfacial characterization of the hexagonal $$beta$$(Mg$$_2$$Si)-phase in Al-Mg-Si-Ag alloy

Ahmed, A.*; Uttarasak, K.*; Tsuchiya, Taiki*; Lee, S.*; Nishimura, Katsuhiko*; Nunomura, Norio*; Ikeno, Susumu*; Malik, A.*; Shimizu, Kazuyuki*; Hirayama, Kyosuke*; et al.

Materials Today Communications (Internet), 43, p.111835_1 - 111835_10, 2025/02

https://doi.org/10.1016/j.mtcomm.2025.111835

Journal Articles

Synthesis of dilute acid-soluble platinum compounds in molten KOH-B$$_{2}$$O$$_{3}$$ medium

Okada, Takashi*; Saito, Junichi; Namie, Masanari; Nishimura, Fumihiro*

Materials Today Communications (Internet), 42, p.111244_1 - 111244_6, 2025/01

https://doi.org/10.1016/j.mtcomm.2024.111244

Dilute acid-soluble platinum compounds were synthesized in a molten KOH-B$$_{2}$$O$$_{3}$$ medium at 500$$^{circ}$$C in the presence of Ca(OH)$$_{2}$$. The acid-soluble platinum compounds formed on the surface of CaCO$$_{3}$$ generated during heat treatment. The platinum compounds consisted of a Pt-O bond, a diborate group, and AlO$$_{6}$$, and the network structure of these components can incorporate K and Ca ions. The compounds were extracted in 1M HCl (aq), and the Pt extraction efficiency was 83%. The morphology of the Pt compounds varied depending on the surface conditions of the reaction containers. When the compounds were synthesized on an alumina plate whose surface was modified with liquid sodium, fibrous platinum compounds were generated, and their crystallinity was higher than that obtained on an untreated alumina plate.

Journal Articles

Oxygen potential of plutonium and plutonium-americium dioxides

Vauchy, R.; Hirooka, Shun; Saito, Kosuke

Materials Today Communications (Internet), 41, p.110676_1 - 110676_17, 2024/12

https://doi.org/10.1016/j.mtcomm.2024.110676
 Times Cited Count：0 Percentile：0.00(Materials Science, Multidisciplinary)

Oxygen potential measurements of PuO$$_{2-x}$$ reported in the open literature were reviewed and re-interpreted using the defect chemistry model developed by our team. An empirical, easy-to-use, relationship connecting the O/Pu ratio, the equilibrium oxygen potential, and the temperature is proposed based on the interpolation of the experimental data in the 953-2100 K temperature range. The effect of americium on the oxygen potential of PuO$$_{2-x}$$ is also discussed.

Journal Articles

Anisotropic creep property related to non-spherical shape of mechanically alloyed powder of oxide dispersion strengthened F82H

Sakasegawa, Hideo; Nakajima, Motoki*; Kato, Taichiro*; Nozawa, Takashi*; Ando, Masami*

Materials Today Communications (Internet), 40, p.109659_1 - 109659_8, 2024/08

https://doi.org/10.1016/j.mtcomm.2024.109659
 Times Cited Count：1 Percentile：17.44(Materials Science, Multidisciplinary)

Nanometric oxide particles play an important role in improving the creep property of Oxide Dispersion Strengthened (ODS) steels. In our previous research, we examined a microstructural feature known as prior particle boundary (PPB). PPB refers to the surface of mechanically alloyed (MA) powders before consolidation. We revealed that the ODS steel with fine PPBs produced from smaller MA powders, exhibited shorter creep rupture times, compared to that with coarse PPBs produced from larger MA powders. The size of MA powders had an impact on the creep property. In this study, we examined the shape of MA powders, which were non-spherical shapes. Such shapes have the potential to induce anisotropic creep behavior. We conducted small punch creep tests on specimens with two different orientations to study the possible anisotropy. The results revealed that the creep rupture times varied depending on the orientation of specimen, thus indicating anisotropic creep property.

Journal Articles

Quantitative X-ray diffraction analysis of solute-enriched stacking faults in $$hcp$$-Mg alloys based on peak asymmetry analysis

Egusa, Daisuke*; Manabe, Ryo*; Kawasaki, Takuro; Harjo, S.; Sato, Shigeo*; Abe, Eiji*

Materials Today Communications (Internet), 31, p.103344_1 - 103344_6, 2022/06

https://doi.org/10.1016/j.mtcomm.2022.103344
 Times Cited Count：12 Percentile：60.04(Materials Science, Multidisciplinary)

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