Thermally stable laser cladded CoCrCuFeNi high-entropy alloy coating with low stacking fault energy

Zhang, Hui; He, Yizhu; Pan, Ye; Guo, Sheng

doi:10.1016/j.jallcom.2014.02.121

Cited by 126 publications

(40 citation statements)

References 31 publications

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“…The low SFE could reduce the critical stress needed to nucleate twins, and, thus, preferably promotes the nucleation of nanotwins. The low SFE is attributable to the fact that the FCC matrix in HEAs contains an extremely large amount of solutes, which can effectively lowering the overall energy of stacking fault by Suzuki interactions [42,43].…”

Section: Fatigue-strengthening Mechanism In Relationship To Twinning mentioning

confidence: 99%

Fatigue behavior of a wrought Al0.5CoCrCuFeNi two-phase high-entropy alloy

et al. 2015

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a b s t r a c tFatigue behavior of a cold-rolled two-phase Al 0.5 CoCrCuFeNi high-entropy alloy (HEA) was studied. Some specimens were fabricated, using commercial-purity raw materials, while others were manufactured with high-purity components. Scatter in the fatigue life of the commercial-purity samples was found in the stress vs. lifetime plot (S-N curve). However, the high-purity samples showed less scatter, and fatigue life is predictable using fatigue statistics. The fatigue property of the alloy is comparable with and may even outperform many commercial alloys. Fatigue cracking is promoted by shrinkage pores with a size of $5 lm, while mechanical nanotwinning was found to be the main deformation mechanism before crack-initiation and during crack propagation by transmission electron microscopy (TEM). Two orientations of dense nanotwins were found at the crack-initiation site, while less-dense nanotwins were found away from the crack initiation site. The nanotwinning behavior resulted in strengthening of the alloy and, consequently, high fatigue strength (383 ± 71 MPa). Moreover, statistical models were applied to predict fatigue life, suggesting that using improved fabrication processes and/or high-purity raw materials may enhance the fatigue behavior and scatter by reducing the number of fabrication microcracks and pores in the test samples.Published by Elsevier Ltd. on behalf of Acta Materialia Inc.

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Section: Fatigue-strengthening Mechanism In Relationship To Twinning mentioning

confidence: 99%

Fatigue behavior of a wrought Al0.5CoCrCuFeNi two-phase high-entropy alloy

et al. 2015

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“…The formation of stacking faults (SFs) after heavy cold rolling and subsequent annealing might lower the strain energy in situ by adjusting atoms to the most energy-favorable positions. Zhang et al 66 found that profuse SFs formed in the CoCrCuFeNi coating after annealing treatment at 750°C, as shown in Fig. 7.…”

Section: Local Atomic Redistribution Influenced By Internal Stresses mentioning

confidence: 91%

Application Prospects and Microstructural Features in Laser-Induced Rapidly Solidified High-Entropy Alloys

Zhang

et al. 2014

JOM

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Recently, high-entropy alloys (HEAs) have attracted much interest in the materials community, as they offer massive opportunities to observe new phenomena, explore new structure, and develop new materials. Particularly, it is attractive to prepare high-performance HEA coatings by laser-induced rapid solidification, which can be formed on the surface of components and parts in a variety of sizes and shapes with a lower cost in comparison with those bulk material fabrication methods. From the technical point of view, laser-induced rapid solidification could hamper the compositional segregation, improve the solubility in solid-solution phases, and lead to the strengthening effect by the grain refinement. This article reviews the recent work on the typical microstructural features and the mechanical and chemical properties in laser-induced rapidly solidified HEAs, and these data are compared with conventional Co-and Ni-based alloy coatings. The article concludes with suggestions for future research and development in HEAs, from considerations of their characteristic properties.

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“…The enhancement in oxidation resistance is attributed to the formation of dense and adherent multi-oxide scale. Zhang et al [51] demonstrated a remarkable thermal stability of laser cladded CrFeCoNiCu HEA coating on Q235 steel substrate up to 750 C. Cai et al [237] investigated the thermal stability of TiVCrCoNi HEA coatings by laser surface alloying on Ti-6Al-4V substrate. They observed the coatings remained stable even after annealing at 900 C for 8 h, and attributed the oxidation resistance of HEA coating to the formation of NiO and the alloying elements: Al, Cr, and Co. Dolique et al [238] reported the stability of AlCrFeCoNiCu HEA thin film up to 510 C using in-situ XRD.…”

Section: Thermal Stability Of Hea Coatingsmentioning

confidence: 99%

High‐Entropy Alloys: Potential Candidates for High‐Temperature Applications – An Overview

2017

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Multi-principal elemental alloys, commonly referred to as high-entropy alloys (HEAs), are a new class of emerging advanced materials with novel alloy design concept. Unlike the design of conventional alloys, which is based on one or at most two principal elements, the design of HEA is based on multi-principal elements in equal or near-equal atomic ratio. The advent of HEA has revived the alloy design perception and paved the way to produce an ample number of compositions with different combinations of promising properties for a variety of structural applications. Among the properties possessed by HEAs, sluggish diffusion and strength retention at elevated temperature have caught wide attention. The need to develop new materials for high-temperature applications with superior high-temperature properties over superalloys has been one of the prime concerns of the high-temperature materials research community. The current article shows that HEAs have the potential to replace Ni-base superalloys as the next generation hightemperature materials. This review focuses on the phase stability, microstructural stability, and high-temperature mechanical properties of HEAs. This article will be highly beneficial for materials science and engineering community whose interest is in the development and understanding of HEAs for high-temperature applications.

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Thermally stable laser cladded CoCrCuFeNi high-entropy alloy coating with low stacking fault energy

Cited by 126 publications

References 31 publications

Fatigue behavior of a wrought Al0.5CoCrCuFeNi two-phase high-entropy alloy

Fatigue behavior of a wrought Al0.5CoCrCuFeNi two-phase high-entropy alloy

Application Prospects and Microstructural Features in Laser-Induced Rapidly Solidified High-Entropy Alloys

High‐Entropy Alloys: Potential Candidates for High‐Temperature Applications – An Overview

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