Strengthening and deformation mechanism of high-strength CrMnFeCoNi high entropy alloy prepared by powder metallurgy

Xing, Yan; Li, C.J.; Mu, Yongkun; Jia, Yandong; Song, Kaikai; Tan, Jun; Wang, G.; Zhang, Zequn; Yi, Jianhong; Eckert, Jürgen

doi:10.1016/j.jmst.2022.06.009

Cited by 43 publications

(5 citation statements)

References 46 publications

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“…Those discrepancies can be attributed mainly to the preparation conditions. Indeed, a single-phase FCC solid solution was obtained after 20-40 h in the mechanically alloyed CrMnFeCoNi using a planetary ball mill (RETSCH PM-400), a ball-to-powder ratio of 10:1, and a rotation speed of 400 rpm [30]. Moreover, it has been reported that the FeCoCrNiMn HEA prepared by arc melting followed by homogenization for 48 h at 1200 • C exhibited a single FCC structure due to the great configurational entropy and small misfit in the mixing enthalpy.…”

Section: Elementmentioning

confidence: 99%

Effect of Aluminum Addition on the Microstructure, Magnetic, and Mechanical Properties of FeCrCoNiMn High-Entropy Alloy

Alleg,

Bekhouche,

Hachache

et al. 2023

Crystals

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High-entropy FeCoCrNiMn (C1) and FeCoCrNiMn10Al10 (C2) alloys (HEAs) were mechanically alloyed for 24 h and heated to 900 °C (C1_900 °C and C2_900 °C). The powders were also compacted into pellets (C1_pellet and C2_pellet) and sintered at 500 °C for 1 h. Crystal structure, microstructure, magnetic, and mechanical properties were investigated by X-ray diffraction, scanning electron microscopy, vibrating sample magnetometry, and microindentation. During the milling process, a mixture of body-centered-cubic (BCC) and face-centered-cubic (FCC) phases with a crystallite size in the range of 9–13 nm was formed in the C1 HEA alloy. The dual FCC + BCC solid solutions remain for the C1_pellet and transform to a single FCC for the C1_900 °C powders. Al addition stabilizes the BCC structure in the FeCoCrNiMn10Al10 HEA alloy, as revealed by the structural refinement. The structure exhibits a mixture of BCC + FCC solid solutions for the C2 powders and BCC + FCC + CrCo sigma phase for the C2_pellet and C2_900 °C powders. The crystallite sizes are in the range of 6-93 nm for all the samples. The saturation magnetization (Ms), coercivity (Hc), and squareness ratio (Mr/Ms) are estimated to be 24.2 emu/g, 153.62 Oe, and 0.165, respectively, for C1 and 28.45 emu/g, 188.48 Oe, and 0.172 for C2. The C1_900 °C and C2_900 °C powders exhibit, respectively, paramagnetic and soft magnetic behaviors and an exchange bias at room temperature. The C1_pellet and C2_pellet HEAs show high hardness values of 584.85 Hv and 522.52 Hv, respectively.

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Section: Elementmentioning

confidence: 99%

Effect of Aluminum Addition on the Microstructure, Magnetic, and Mechanical Properties of FeCrCoNiMn High-Entropy Alloy

Alleg,

Bekhouche,

Hachache

et al. 2023

Crystals

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“…Therefore, many studies have focused on improving the strength and hardness of the alloys (Ali et al, 2022). Among them, in terms of preparation methods, the grain size of HEAs prepared by powder metallurgy methods can easily reach the ultrafine grain or even nanocrystal level, which can greatly improve the mechanical properties (Toroghinejad et al, 2022a(Toroghinejad et al, , 2022bXing et al, 2023). In addition, powder metallurgy allows for the preparation of parts that are close to net shape, which improves material utilization and further enables the widespread use of HEA.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ti and C addition on oxidation resistance of FeCoCrNiMn high entropy alloys prepared by powder metallurgy

Wang,

Liu,

et al. 2024

ACMM

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Purpose The purpose of this paper is to study the high temperature oxidation behavior of Ti and C-added FeCoCrNiMn high entropy alloys (HEAs). Design/methodology/approach Cyclic oxidation method was used to obtain the oxidation kinetic profile and oxidation rate. The microstructures of the surface and cross section of the samples after oxidation were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). Findings The results show that the microstructure of the alloy mainly consisted of FCC (Face-centered Cubic Structure) main phase and carbides (M7C3, M23C6 and TiC). With the increase of Ti and C content, the microhardness, strength and oxidation resistance of the alloy were effectively improved. After oxidation at a constant temperature of 800 °C for 100 h, the preferential oxidation of chromium in the chromium carbide determined the early formation of dense chromium oxide layers compared to the HEAs substrate, resulting in the optimal oxidation resistance of the TC30 alloy. Originality/value More precipitated CrC can preferentially oxidize and rapidly form a dense Cr2O3 layer early in the oxidation, which will slow down the further oxidation of the alloy.

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“…The concept of high-entropy alloys (HEAs) [10][11][12], also known as multi-major element alloys, was first introduced in 2004. When multiple elements are mixed in near-equal atomic ratios, the resulting alloys do not form complex intermetallic compounds but simple solid solution structures [13][14][15][16]. This emergence of HEAs challenges the traditional design concept of alloys based on mixed enthalpy and opens up a wide range of possibilities for the research and development of new materials.…”

Section: Introductionmentioning

confidence: 99%

Ultrasound-Assisted Synthesis of High-Entropy Materials for Enhanced Oxygen Evolution Electrocatalysis

Wang,

Zhang,

Zhang

et al. 2024

Metals

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High-entropy materials (HEMs) play a significant role in the electrocatalytic oxygen evolution reaction (OER) due to their unique properties. However, there are still challenges in the preparation of HEMs for OER catalysts. In this study, the FeCoNiMnCr catalyst is synthesized for the first time using the ultrasonic hydrothermal-sintering technique and exhibits excellent performance for OER electrocatalysis. There is an optimal ultrasonic hydrothermal time and power for achieving the best OER performance. The results demonstrate that the performance of FeCoNiMnCr catalysts prepared through ultrasonic hydrothermal sintering (US-FeCoNiMnCr) is significantly improved compared with the traditional hydrothermal-sintering method. The US-FeCoNiMnCr catalyst exhibits an overpotential of 228 mV at the current density of 10 mA cm−2 and a Tafel slope as low as 45.39 mV dec−1 in an alkaline medium. Moreover, the US-FeCoNiMnCr catalyst demonstrates remarkable stability in electrocatalytic OER with a minimal potential increase observed even after 48 h. This work not only provides valuable insights into high-entropy material synthesis, but also presents a powerful electrocatalyst for water electrolysis.

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Strengthening and deformation mechanism of high-strength CrMnFeCoNi high entropy alloy prepared by powder metallurgy

Cited by 43 publications

References 46 publications

Effect of Aluminum Addition on the Microstructure, Magnetic, and Mechanical Properties of FeCrCoNiMn High-Entropy Alloy

Effect of Aluminum Addition on the Microstructure, Magnetic, and Mechanical Properties of FeCrCoNiMn High-Entropy Alloy

Effect of Ti and C addition on oxidation resistance of FeCoCrNiMn high entropy alloys prepared by powder metallurgy

Ultrasound-Assisted Synthesis of High-Entropy Materials for Enhanced Oxygen Evolution Electrocatalysis

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