Achieving a High-Strength CoCrFeNiCu High-Entropy Alloy with an Ultrafine-Grained Structure via Friction Stir Processing

Li, Ning; Jia, Chunmei; Wang, Zhiwei; Wu, L.H.; Ni, D.R.; Li, Zhengkun; Fu, Huameng; Xue, P.; Xiao, B.L.; Ma, Z.Y.; Shao, Yingjuan; Chang, Yunlong

doi:10.1007/s40195-020-01037-9

Cited by 49 publications

(9 citation statements)

References 45 publications

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“…However, the strength of CoCrFeNiMn high-entropy alloy is poor, and the hardness is 183.2 HV 0.2 . 22 When the coating is added with hard ceramic phase, the CoCrFeNiMn matrix phase can retain the plastic toughness to a certain extent. The involvement of hard phase can upgrade the strength of the high-entropy alloy coating and make the composite coating have good comprehensive mechanical properties.…”

Section: Preparation Of High Entropy Alloy Composite Coatingmentioning

confidence: 99%

Study on tribological properties of high entropy alloy composite coatings with different tungsten carbide contents in laser cladding

Chen¹

2023

Adv Control Appl

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The severe working conditions of mining machinery make the wear of its parts extremely serious, thus reducing its service life, increasing the probability of accidents, and may cause huge economic wastage. So promoting the improvement of mining machinery is imperative, and the melting of wear‐resistant layer on the surface of wear‐prone equipment is a more effective improvement method. The study was performed by laser fusing a composite coating of CoCrFeNiMn high‐entropy alloy with different WC contents, and a second phase was generated in the coating by an additive method to achieve the strengthening of the coating. The experiments revealed that all the coatings had FCC phase as the main phase by analyzing the phase conformation, structure, stiffness, and abrasiveness. When the WC dosage exceeded 20 wt.%, Fe3W3 (M6C) carbide reinforced phases with different morphologies were produced in the coatings. Forty wt.% of the coatings showed the highest hardness, which was 3.1 times better than that of the coatings without WC particles, and 30 wt.% of the coatings showed the best abrasiveness. HT0 coatings showed the least friction factor of 0.27. HT600 and HT800 corresponded to friction factors of 0.37 and 0.35, respectively. The coefficient of friction of the coating was most stable after about 3 min at room temperature, and the wear phase took longer after annealing. During the break‐in phase, the precipitated phase has a supportive effect and prolongs the break‐in period. The coating using the studied method improves the wear resistance of mechanical parts and extends their service life, which has some economic and practical value.

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Section: Preparation Of High Entropy Alloy Composite Coatingmentioning

confidence: 99%

Study on tribological properties of high entropy alloy composite coatings with different tungsten carbide contents in laser cladding

Chen¹

2023

Adv Control Appl

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“…FSW has been widely investigated in metals and metal matrix composites. [9][10][11][12][13][14][15] Recently, it has also been applied to the joining of metals to plastics. A variation of FSW called friction-lap joining (FLJ) with a pinless tool was designed for the joining of metals to CFRPs.…”

Section: Introductionmentioning

confidence: 99%

Achieving a Strong Friction‐Lap Joint of Continuous Carbon‐Fiber‐Reinforced Plastic/Aluminum Alloy via a Surface Laser‐Processing Pretreatment

Jiang

Liu

et al. 2023

Adv Eng Mater

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It is difficult to achieve high‐strength joints of metals to carbon‐fiber‐reinforced plastics (CFRPs) with high contents of continuous fibers with the poor fluidity. Herein, a special designed laser‐processing pretreatment is conducted on the surface of 5052Al, and friction‐lap joining (FLJ) is employed to join pretreated 5052Al to the CFRP with 50%–55% fiber content. The maximal tensile shear force and strength reach 4.06 kN and 18.04 MPa, respectively, with an increment of 72% compared to the untreated sample. It is the first time to achieve the high‐strength joint of Al alloys to CFRPs with high contents of continuous fibers via FLJ. The joining area and adhesion work are quantified by theoretical calculations, and the residual stresses are visualized by finite‐element analysis. The laser‐processing pretreatment changes the plain Al alloy surface structure into the rough and porous structure, largely increasing the mechanical interlocking effect of the joint, and also changes the Al alloy surface wetting behavior and increases the adhesion work from 59.66 to 81.17 mN m−1. That largely changes the chemical reaction feature between the CFRP and Al alloy, resulting in their tight bonding. In addition, the residual stresses weaken, which further improve the tight bonding effect.

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“…In recent years, the academic research upsurge of highentropy alloys (HEAs) or multi-principal element alloys (MPEAs) has been tremendously aroused due to the unprecedented combinations of high toughness, good thermal stability, excellent wear resistance, and remarkable strength under extreme conditions [1][2][3][4][5][6][7][8][9]. Therefore, HEAs have become one of the most promising structural materials for many industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Features and Mechanical Behaviors of Al0.5Cr0.8CoFeNi2.5V0.2 High-Entropy Alloys Fabricated by Selective Laser Melting Technique

Yao

Song

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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In this work, high strength and ductile Al 0.5 Cr 0.8 CoFeNi 2.5 V 0.2 high-entropy alloys (HEAs) were fabricated by the selective laser melting (SLM) technique. After orthogonal experiments, it was verified that a wide SLM processing parameter window can be used to produce crack-free samples for the investigated HEAs. All the printed HEA samples exhibit good densification higher than 98.3%. It was found that obvious epitaxial growth leads to the formation of the cylindrical and equiaxed ordered face-centered cubic (FCC) crystals, displaying the characteristics of sub-cylindrical and sub-cellular microstructures. The low-angle grain boundaries (LAGBs) prefer appearing around subgrain structures, while the high-angle grain boundaries (HAGBs) tend to form around coarse grains. Two HEA samples with high and low apparent densities were selected to observe their mechanical properties, which exhibit Vickers hardness higher than 263 HV and do not fail during compression. With increasing densification, the strength gradually rises. According to the engineering stress-strain curves during compression, the yield strength is higher than 530 MPa, while the strength near 40% engineering strain is larger than 1840 MPa. During deformation, a large density of dislocations becomes popular within subgrain structures together with the pre-existing dislocations from rapid solidification, leading to the formation of planar and cross slip bands. Within coarse cylindrical crystals, some deformation twins are also induced together with the appearance of a distinct copper-type texture during deformation. As a result, the as-printed samples display better mechanical properties than the as-cast counterpart. The present studies provide a very good HEA candidate for the SLM process, but more work should be conducted to achieve excellent comprehensive properties.

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Achieving a High-Strength CoCrFeNiCu High-Entropy Alloy with an Ultrafine-Grained Structure via Friction Stir Processing

Cited by 49 publications

References 45 publications

Study on tribological properties of high entropy alloy composite coatings with different tungsten carbide contents in laser cladding

Study on tribological properties of high entropy alloy composite coatings with different tungsten carbide contents in laser cladding

Achieving a Strong Friction‐Lap Joint of Continuous Carbon‐Fiber‐Reinforced Plastic/Aluminum Alloy via a Surface Laser‐Processing Pretreatment

Microstructural Features and Mechanical Behaviors of Al0.5Cr0.8CoFeNi2.5V0.2 High-Entropy Alloys Fabricated by Selective Laser Melting Technique

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