Novel welding of Al0.5CoCrFeNi high-entropy alloy: Corrosion behavior

Sokkalingam, R.; Sivaprasad, K.; Duraiselvam, Muthukannan; Muthupandi, V.; Prashanth, K.G.

doi:10.1016/j.jallcom.2019.153163

Cited by 41 publications

(18 citation statements)

References 23 publications

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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%

“…Overall, the applicability of these dissimilar joints for structural applications was confirmed by means of mechanical testing, where the dissimilar joint exhibited superior values for the yield strength and ultimate tensile strength (≈265 and ≈590 MPa, respectively) than that of the HEA side of the BM (≈148 and ≈327 MPa, respectively). The corrosion behavior of laser welded Al0.5CoCrFeNi HEA was studied by Sokkalingam et al [64], by evaluating the corrosion potential and corrosion current density obtained by potentiodynamic polarization tests. The BM was composed by an equiaxed microstructure composed by Cr-Fe and Al-Ni rich phases and Al-rich particles.…”

Section: Other Hea Systemsmentioning

confidence: 99%

“…Cu segregation was seen to promote solidification cracking in the fusion zone of the GTAW joints. By changing the alloy composition, it was possible to mitigate the cracking The corrosion behavior of laser welded Al 0.5 CoCrFeNi HEA was studied by Sokkalingam et al [64], by evaluating the corrosion potential and corrosion current density obtained by potentiodynamic polarization tests. The BM was composed by an equiaxed microstructure composed by Cr-Fe and Al-Ni rich phases and Al-rich particles.…”

Section: Other Hea Systemsmentioning

confidence: 99%

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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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Section: Fusion-based Welding Of Heasmentioning

confidence: 99%

Section: Other Hea Systemsmentioning

confidence: 99%

Section: Other Hea Systemsmentioning

confidence: 99%

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A Short Review on Welding and Joining of High Entropy Alloys

Lopes

Oliveira

2020

Metals

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“…Comparatively, laser welding has a higher welding rate and is preferable to large-volume processing. During processing, laser welding offers a focused heat source and facilitates the formation of a deeply narrow weld zone [6,9,10]. On the other hand, laser welding restricts the extension of the heat-affected zone and thus minimizes the deformation of welded parts [11].…”

Section: Introductionmentioning

confidence: 99%

Laser Beam Welding of Feconicrmn High-Entropy Alloys with Preplaced Powders

Zhou

Zheng

et al. 2020

Metals

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In this paper, as-annealed FeCoNiCrMn plates were laser-welded with preplaced FeCoNiCrMn and FeCoNiCrAl powders, respectively. The grains in the fusion zone of the weld with FeCoNiCrMn powder have a reduced aspect ratio compared to those without preplaced powders and the weld with FeCoNiCrAl powder presents relative equiaxed grains. The yield strength of each weld has been remarkably enhanced when referring to the base alloy, and the ultimate tensile strength of each weld with preplaced powder exceeds 80% of that of the base and the maximum reaches 88.5% when referring to the weld with preplaced FeCoNiCrMn powder. Cleavage fractography was observed in the welds. The finding of this work will service the engineering practices of high-entropy alloys.

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“…High‐entropy alloys (HEA) are novel multi‐component alloy systems that have recently attracted the interest of the research communities 1–4 . As supposed to the traditional alloying concept, the addition of multiple alloying elements with varying atomic sizes in equimolar or nearly equimolar proportions was found to result in the formation of simple substitutional solid solution due to reduction in Gibb's free energy in the HEA alloy system with the multiple numbers of principal alloying elements 5,6 .…”

Section: Introductionmentioning

confidence: 99%

Microstructure and properties of in‐situ high entropy alloy/tungsten carbide composites by mechanical alloying.

Sokkalingam

Tarraste

Surreddi

et al. 2020

Mat Design & Process Comms

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Al0.1CoCrFeNi‐high entropy alloy (HEA) /tungsten carbide (WC)metal matrix composite was successfully prepared by mechanical alloying and subsequent spark plasma sintering. The different volume fraction of WC was distributed evenly by varying the powder milling parameters from gentle milling (~1.37% WC) and intensive milling (~14.27% WC). Sintering of gently milled powder has resulted in the evolution of three‐phased microstructure: α‐fcc and Cr‐ rich σ‐phase with some WC‐phase distributed in the HEA matrix. On the other hand, the sintering of intensively milled powder has resulted in a two‐phased microstructure: α‐fcc phase with even and dense distribution of WC‐phased particles without any Cr‐ rich σ‐phase. The absence of σ‐phase is attributed to a complete alloying of Cr in the HEA matrix. Microhardness analysis and compression test indicate that a ~ 13% difference in WC fraction has resulted in an enhancement in hardness (46%) and compressive strength (~ 500 MPa).

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Novel welding of Al0.5CoCrFeNi high-entropy alloy: Corrosion behavior

Cited by 41 publications

References 23 publications

A Short Review on Welding and Joining of High Entropy Alloys

A Short Review on Welding and Joining of High Entropy Alloys

Laser Beam Welding of Feconicrmn High-Entropy Alloys with Preplaced Powders

Microstructure and properties of in‐situ high entropy alloy/tungsten carbide composites by mechanical alloying.

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