Corrosion Behavior of Selectively Laser Melted CoCrFeMnNi High Entropy Alloy

Ren, Jie; Mahajan, Chaitanya; Liu, Liang; Follette, David M.; Chen, Wen; Mukherjee, Sundeep

doi:10.3390/met9101029

Cited by 50 publications

(21 citation statements)

References 40 publications

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“…Compared with the conventionally cast HEAs, the CoCrFeNiMn fabricated using LAAM possessed significantly higher yield strength and ultimate tensile strength, because of the finer grains. Ren et al [ 13 ] and Xu et al [ 14 ] comparatively analyzed the corrosion behavior of the SLM-produced and as-cast CoCrFeMnNi HEA in 3.5 wt % NaCl solution. Compared with as cast material, CoCrFeMnNi high-entropy alloy prepared by SLM had better composition uniformity and better corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Response of CoCrFeMnNi High-Entropy Alloy Fabricated by Selective Laser Melting

Wang

Sun

et al. 2020

Materials

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This study investigated the anisotropic characteristics of the microstructural, mechanical and corrosion properties of CoCrFeMnNi high-entropy alloy produced by selective laser melting (SLM) additive manufacturing (AM). Under the extremely high thermal gradient during the SLM process, a columnar solidification structure with a single face-centered cubic (FCC) phase structure was formed. The crystal structure exhibited a regular checkerboard structure in the XOY plane (perpendicular to the building direction), which was composed of {110} direction and a small amount of {100} fiber texture. The cellular-dendritic sub-structures formed in the columnar crystal structure with sizes of about 500 nm in diameter. As for the mechanical properties, the XOY plane exhibited higher ultimate tensile strength and yield strength (σ0.2) but lower elongation to failure compared to the XOZ plane (parallel to building direction), which reflected the anisotropy of the microstructure. The electrochemical test results of the different planes showed that the XOZ plane exhibited better corrosion resistance in comparison with the XOY plane in the 3.5 wt % NaCl solution, which was on account of the selective attack at the Mn-rich inter-cellular regions and the different structures of the cellular-dendritic sub-structures on different planes.

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Section: Introductionmentioning

confidence: 99%

Anisotropic Response of CoCrFeMnNi High-Entropy Alloy Fabricated by Selective Laser Melting

Wang

Sun

et al. 2020

Materials

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“…Ren et al [383] reported the superior corrosion resistance of SLM-built CoCrFeMnNi HEA compared to its arc-melted counterpart because of the homogeneous elemental distribution and lower density of micro-pores in SLM sample acting as local anodic sites and inhibiting the nucleation and growth of new pits. In a similar study, the corrosion behavior of CoCrFeMnNi HEA manufactured using SLM in 3.5 wt.% NaCl solution was studied by Xu et al [361].…”

Section: Laser-processed Heasmentioning

confidence: 99%

Review of Powder Bed Fusion Additive Manufacturing for Metals

Ladani

Sadeghilaridjani

2021

Metals

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Additive manufacturing (AM) as a disruptive technology has received much attention in recent years. In practice, however, much effort is focused on the AM of polymers. It is comparatively more expensive and more challenging to additively manufacture metallic parts due to their high temperature, the cost of producing powders, and capital outlays for metal additive manufacturing equipment. The main technology currently used by numerous companies in the aerospace and biomedical sectors to fabricate metallic parts is powder bed technology, in which either electron or laser beams are used to melt and fuse the powder particles line by line to make a three-dimensional part. Since this technology is new and also sought by manufacturers, many scientific questions have arisen that need to be answered. This manuscript gives an introduction to the technology and common materials and applications. Furthermore, the microstructure and quality of parts made using powder bed technology for several materials that are commonly fabricated using this technology are reviewed and the effects of several process parameters investigated in the literature are examined. New advances in fabricating highly conductive metals such as copper and aluminum are discussed and potential for future improvements is explored.

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“…A. Ayyagari, Hasannaeimi, Grewal, et al, 2018;Ren et al, 2019;Todai et al, 2017). HEAs are composed of multiple principal elements that result in unique strengthening mechanisms and resistance to failure under dynamic loading.…”

Section: Mechanochemical Degradationmentioning

confidence: 99%

“…Therefore, it is paramount to investigate and understand the electrochemical response during mechanochemical degradation in vivo under dynamic loading. In terms of design and development of new metallic biomaterials, a new generation of biocompatible alloys named high‐entropy alloys (HEAs) and bulk metallic glasses (BMG) show excellent mechanical and corrosion behaviour that is superior in many cases compared to presently used bioimplant materials (A. Ayyagari, Hasannaeimi, Arora, Hasannaeimi, Arora, & Mukherjee, 2018; A. Ayyagari, Hasannaeimi, Grewal, et al., 2018; Ren et al., 2019; Todai et al., 2017). HEAs are composed of multiple principal elements that result in unique strengthening mechanisms and resistance to failure under dynamic loading.…”

Section: Electrochemical Measurements Sensors and Degradation Mechanmentioning

confidence: 99%

Bio‐electrochemical response to sense implant degradation

et al. 2020

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In vivo monitoring of biomedical implants to detect early stages of failure is currently unavailable. State-of-the-art imaging techniques do not provide information about small-scale localized changes in the implant and surrounding environment, which are key to early detection of failure. Here, we discuss different electrochemical responses of implants during degradation which may be utilized to develop biosensors to monitor implant degradation in vivo. This review is focused on identifying the need, potential measurement techniques and degradation response obtained from sensors based on electrochemical signature of biomedical implants. Benefits of designing these novel sensors include continuous monitoring, early failure detection, reduced post-surgery and prevention of catastrophic failure from implant degradation.

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Corrosion Behavior of Selectively Laser Melted CoCrFeMnNi High Entropy Alloy

Cited by 50 publications

References 40 publications

Anisotropic Response of CoCrFeMnNi High-Entropy Alloy Fabricated by Selective Laser Melting

Anisotropic Response of CoCrFeMnNi High-Entropy Alloy Fabricated by Selective Laser Melting

Review of Powder Bed Fusion Additive Manufacturing for Metals

Bio‐electrochemical response to sense implant degradation

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