Microstructures and mechanical properties of a welded CoCrFeMnNi high-entropy alloy

Wu, Zhenggang; David, S. A.; Leonard, Donovan N.; Zhao, Feng; Bei, Hongbin

doi:10.1080/13621718.2018.1430114

Cited by 83 publications

(52 citation statements)

References 64 publications

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“…The obtained results demonstrate for the first time the possibility to produce sound butt joints of the Ti 1.89 NbCrV 0.56 RHEA by LBW, which is an important step toward potential practical applications of this new class of metallic alloys. However, the present study also emphasized the importance of LBW process parameters (particularly pre-heating temperature) to obtain good results, which is quite different from the transition metals HEAs [27][28][29][30][31][32]44,45]. Given the wide range of the available RHEAs compositions [7], specific attention should be paid to select proper welding conditions for each individual alloy.…”

Section: Resultsmentioning

confidence: 84%

“…Weldability is another crucial technological property of the structural materials, since welding is one of the most reliable and efficient ways of joining different parts together. A few studies on welding of HEAs were reported recently [27][28][29][30][31][32]. The efficiency of using arc welding [28], laser beam welding (LBW) [31], electron beam welding [27,28], and friction stir welding [29,30,32] was shown to obtain sound joints in HEAs with reasonable mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

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Laser Beam Welding of a Low Density Refractory High Entropy Alloy

Panina

Yurchenko

Zherebtsov

et al. 2019

Metals

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The effect of laser beam welding on the structure and properties of a Ti1.89NbCrV0.56 refractory high entropy alloy was studied. In particular, the effect of different pre-heating temperatures was examined. Due to the low ductility of the material, laser beam welding at room temperature resulted in the formations of hot cracks. Sound butt joints without cracks were produced using pre-heating to T ≥ 600 °C. In the initial as-cast condition, the alloy consisted of coarse bcc grains with a small amount of lens-shaped C15 Laves phase particles. A columnar microstructure was formed in the welds; the thickness of the grains increased with the temperature of pre-heating before welding. The Laves phase particles were formed in the seams after welding at 600 °C or 800 °C, however, these particles were not observed after welding at room temperature or at 400 °C. Soaking at elevated temperatures did not change the microstructure of the base material considerably, however, “additional” small Laves particles formed at 600 °C or 800 °C. Tensile test of welded specimens performed at 750 °C resulted in the fracture of the base material because of the higher hardness of the welds. The latter can be associated with the bcc grains refinement in the seams.

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Section: Resultsmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Laser Beam Welding of a Low Density Refractory High Entropy Alloy

Panina

Yurchenko

Zherebtsov

et al. 2019

Metals

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“…Several studies [53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69] have already been reported on fusion-based welding of HEAs. To date, these works focus mainly on laser-based techniques, although some information is also available on Electron Beam and Gas Tungsten Arc Welding (GTAW) techniques.…”

Section: Fusion-based Welding Of Heasmentioning

confidence: 99%

“…Concerning other fusion-based welding techniques, Wu et al [60,61] investigated Electron Beam Welding and Gas Tungsten Arc Welding (GTAW) on a CoCrFeMnNi HEA. For this purpose, ingots were produced via arc-melting and then thermomechanically processed to achieve a homogeneous equiaxed microstructure.…”

Section: Cocrfenimn Hea Systemmentioning

confidence: 99%

A Short Review on Welding and Joining of High Entropy Alloys

Lopes

Oliveira

2020

Metals

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High entropy alloys are one of the most exciting developments conceived in the materials science field in the last years. These novel advanced engineering alloys exhibit a unique set of properties, which include, among others, good mechanical performance under severe conditions in a wide temperature range and high microstructural stability over long time periods. Owing to the remarkable properties of these alloys, they can become expedite solutions for multiple structural and functional applications. Nevertheless, like any other key engineering alloy, their capacity to be welded, and thus become a permanent feature of a component or structure, is a fundamental issue that needs to be addressed to further expand these alloys’ potential applications. In fact, welding of high entropy alloys has attracted some interest recently. Therefore, it is important to compile the available knowledge on the current state of the art on this topic in order to establish a starting point for the further development of these alloys. In this article, an effort is made to acquire a comprehensive knowledge on the overall progress on welding of different high entropy alloy systems through a systematic review of both fusion-based and solid-state welding techniques. From the current literature review, it can be perceived that welding of high entropy alloys is currently gaining more interest. Several high entropy alloy systems have already been successfully welded. However, most research works focus on the well-known CoCrFeMnNi. For this specific system, both fusion and solid-state welding have been used, with no significant degradation of the joints’ mechanical properties. Among the different welding techniques already employed, laser welding is predominant, potentially due to the small size of its heat source. Overall, welding of high entropy alloys is still in its infancy, though good perspectives are foreseen for the use of welded joints based on these materials in structural applications.

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“…There are many studies on welding HEAs [35][36][37]. Good mechanical properties have been achieved in previous studies [38][39][40]. However, very limited researches are focused on brazing HEAs [41].…”

Section: Introductionmentioning

confidence: 99%

Dissimilar Infrared Brazing of CoCrFe(Mn)Ni Equiatomic High Entropy Alloys and 316 Stainless Steel

Lin

Shiue

et al. 2019

Crystals

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Dissimilar infrared brazing of CoCrFeMnNi/CoCrFeNi equiatomic high entropy alloys and 316 stainless steel using MBF601 and BNi-2 foils was evaluated. The wetting angles of the two fillers at 50 °C above their liquidus temperatures on the three substrates were below 40 degrees. The CoCrFeMnNi/316 SS joint had the highest shear strength of 361 MPa with BNi-2 filler brazing at 1020 °C for 180 s, and fractured at the CrB compound in the joint. The CoCrFeMnNi/MBF601/316 SS joint contained a CoCrFeMnNi-based matrix, phosphides and B-containing compounds. The CoCrFeNi/316 SS joint had the highest shear strength of 374 MPa when brazed with BNi-2 filler at 1020 °C for 600 s, and fractured at the CrB in the joint. The CoCrFeNi/MBF601/316 SS joint consisted of a (Fe,Ni)-rich matrix, phosphides and B/Cr/Fe/P compounds, and the highest shear strength of 324 MPa was achieved when it was brazed at 1080 °C for 600 s.

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Microstructures and mechanical properties of a welded CoCrFeMnNi high-entropy alloy

Cited by 83 publications

References 64 publications

Laser Beam Welding of a Low Density Refractory High Entropy Alloy

Laser Beam Welding of a Low Density Refractory High Entropy Alloy

A Short Review on Welding and Joining of High Entropy Alloys

Dissimilar Infrared Brazing of CoCrFe(Mn)Ni Equiatomic High Entropy Alloys and 316 Stainless Steel

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