Microstructure, mechanical properties and tribological performance of CoCrFeNi high entropy alloy matrix self-lubricating composite

Zhang, Aijun; Han, Jiesheng; Su, Bo; Li, Pengde; Meng, Junhu

doi:10.1016/j.matdes.2016.11.072

Cited by 214 publications

(43 citation statements)

References 26 publications

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“…17,18 Complex Cobalt-Chromium oxides have been reported to be typically present in tribofilms and passivation layers of alloys containing the respective elements providing surface protection from aggressive degradation. 19,20 A 3D reconstruction of the wear track obtained using white light interferometry is shown in Fig. 3d.…”

Section: Resultsmentioning

confidence: 99%

Surface degradation mechanisms in a eutectic high entropy alloy at microstructural length-scales and correlation with phase-specific work function

et al. 2019

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High entropy alloys represent a new paradigm of structural alloy design consisting of (near) equal proportions of constituent elements resulting in a number of attractive properties. In particular, eutectic high entropy alloys offer a remarkable combination of high strength and good ductility from the synergistic contribution of each phase in the eutectic, thereby circumventing the strength-ductility trade-off in conventional structural materials. In the present study, wear and corrosion behavior were evaluated for the AlCoCrFeNi 2.1 eutectic high entropy alloy consisting of BCC (B2), and FCC (L1 2) lamellae. A transition from adhesive to oxidative wear was observed in reciprocating wear analysis. The L1 2 phase with lower hardness preferentially deformed during the wear test. The ratio of hardness to modulus was almost two times higher for the B2 phase as compared to L1 2. The overall corrosion resistance of the eutectic high entropy alloy was comparable to 304 stainless steel in 3.5 wt% NaCl solution. However, detailed microscopy revealed preferential dissolution of the B2 phase. Phase-specific scanning kelvin probe analysis showed relatively higher electropositivity for the B2 phase as compared with L1 2 , supporting the selective corrosion and higher coefficient of friction of B2.

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Section: Resultsmentioning

confidence: 99%

Surface degradation mechanisms in a eutectic high entropy alloy at microstructural length-scales and correlation with phase-specific work function

et al. 2019

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“…Comparison of hardness and fracture toughness synergy of the microwave-derived CCA composite claddings with other coating/claddings and different CCA compositions. [18,[40][41][42][43][44] MC, microwave cladding; TS, thermal spray; LP, laser processing; SPS, spark plasma sintering; AM, arc melting.…”

Section: Slurry Erosion Behavior and Correlation Parametersmentioning

confidence: 99%

Slurry Erosion–Corrosion of Bimodal Complex Concentrated Alloy Composite Cladding

2020

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Herein, bimodal-reinforced AlCoCrFeNi complex concentrated alloy composite cladding on stainless steel 316L substrate using microwave hybrid processing is synthesized. Detailed microstructural analysis of the claddings shows the presence of cellular structure A2 (disordered BCC) with intermetallics (B2 (ordered BCC) and σ phases) at the intercellular regions. The presence of Cr 23 C 6 is also observed for the reinforced claddings due to the dissociation of the SiC particles. The bimodal-reinforced cladding shows the highest hardness (in excess of 800 HV) and fracture toughness (%12 MPa p m), followed by microand nanocomposite claddings. Under slurry erosion condition, the bimodal composite cladding exhibits 10 times better erosion resistance than stainless steel 316L and nonreinforced cladding (1.5-2 times), respectively, at oblique angle followed by nano-and microreinforced unimodal counterparts. The outstanding performance of the bimodal composite cladding under both test conditions is related to higher hardness, fracture toughness, and resistance to plastic deformation. The detailed analysis of the eroded samples shows microcutting and ploughing as a dominant mechanism at an oblique angle while platelets, cracks, and microindents being the contributing factors for erosion at the normal impact angle.

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“…High entropy alloys (HEAs) contain at least five elements in equiatomic or near-equiatomic ratios and have excellent properties [ 1 , 2 , 3 , 4 ]. They tended to form a simple solid-solution phase when first proposed by Yeh et al [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Mechanical Properties and Microstructure of an (Al0.5CoCrFeNi)0.95Mo0.025C0.025 High Entropy Alloy

Wang

Liu

et al. 2019

Entropy

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The dynamic mechanical properties and microstructure of the (Al0.5CoCrFeNi)0.95Mo0.025C0.025 high entropy alloy (HEA) prepared by powder extrusion were investigated by a split Hopkinson pressure bar and electron probe microanalyzer and scanning electron microscope. The (Al0.5CoCrFeNi)0.95Mo0.025C0.025 HEA has a uniform face-centered cubic plus body-centered cubic solid solution structure and a fine grain-sized microstructure with a size of about 2 microns. The HEA possesses an excellent strain hardening rate and high strain rate sensitivity at a high strain rate. The Johnson–Cook plastic model was used to describe the dynamic flow behavior. Hat-shaped specimens with different nominal strain levels were used to investigate forced shear localization. After dynamic deformation, a thin and short shear band was generated in the designed shear zone and then the specimen quickly fractured along the shear band.

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Microstructure, mechanical properties and tribological performance of CoCrFeNi high entropy alloy matrix self-lubricating composite

Cited by 214 publications

References 26 publications

Surface degradation mechanisms in a eutectic high entropy alloy at microstructural length-scales and correlation with phase-specific work function

Surface degradation mechanisms in a eutectic high entropy alloy at microstructural length-scales and correlation with phase-specific work function

Slurry Erosion–Corrosion of Bimodal Complex Concentrated Alloy Composite Cladding

Dynamic Mechanical Properties and Microstructure of an (Al0.5CoCrFeNi)0.95Mo0.025C0.025 High Entropy Alloy

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