☆ 4.7 Article

Carbide precipitation strengthening in fine-grained carbon-doped FeCoCrNiMn high entropy alloy

JOURNAL OF ALLOYS AND COMPOUNDS (2019)

期刊

JOURNAL OF ALLOYS AND COMPOUNDS

卷 803, 期 -, 页码 491-498

出版社

ELSEVIER SCIENCE SA

DOI: 10.1016/j.jallcom.2019.06.204

关键词

FeCoCrNiMn-1.3C; High-entropy alloy (HEA); Nano-sized carbide precipitation; Annealing; Grain refinement; Precipitation strengthening

类别

Chemistry, Physical Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering

资金

National Major Science and Technology Project of China [2014ZX07214-002]

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Protocol

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摘要

Nano-sized carbides in carbon-doped high entropy alloys (HEAs) can induce remarkable precipitation strengthening, but the precipitation behavior and its effects on mechanical properties has not been clarified. In this study, a heavy-carbon doped equiatomic FeCoCrNiMn HEA with 1.3 at.% C addition (FeCoCrNiMn-1.3C) was prepared to provide an insight into the effect of carbides precipitation on the strength of the HEA. The results showed that FeCoCrNiMn-1.3C HEA exhibited a single FCC structure after homogenization treatment at 1220 degrees C for 6 h and the subsequent severe cold rolling (SCR) with 95% reduction. It was found that nano-sized M23C6 carbides can precipitate and exist stably in the SCRed FeCoCrNiMn-1.3C HEA during annealing at 700-1000 degrees C. These nano-sized M23C6 precipitations can substantially inhibit the recrystallized grain growth of FCC matrix in the SCRed FeCoCrNiMn HEA during annealing. The average grain size of the SCRed HEA can be maintained at 2.4 mu m even after annealing at 1000 degrees C for 1 h due to the M23C6 precipitations inhibition on grain growth. The yield strength of similar to 1040 MPa with total elongation of similar to 12% has been achieved in FeCoCrNiMn-1.3C HEA after annealing at 700 degrees C for 1 h. Grain refinement and precipitation strengthening are the two major strengthening mechanisms of the present annealed FeCoCrNiMn-1.3C HEAs. (C) 2019 Elsevier B.V. All rights reserved.

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High-performance low-temperature solid oxide fuel cell with nanostructured lanthanum strontium cobaltite/yttria-stabilized zirconia cathode via advanced co-sputtering

Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee

Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.

JOURNAL OF ALLOYS AND COMPOUNDS (2024)

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Article Chemistry, Physical

Amorphous quaternary alloy nanoplates for efficient catalysis of hydrogen evolution reaction

Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu

Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.

JOURNAL OF ALLOYS AND COMPOUNDS (2024)

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