Laser 3D printing of CoCrFeMnNi high-entropy alloy

Gao, Xiaoyu; Lu, Yunzhuo

doi:10.1016/j.matlet.2018.10.084

Cited by 74 publications

(22 citation statements)

References 19 publications

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“…The powder stored in the powder hoppers was fed through four coaxial nozzles by argon flow and injected into the melt pool created by the laser beam. The powder was delivered into the laser molten pool with the rate fixed at 16 g/min 33 . The 45 steel plates with the dimension of 50 mm × 30 mm × 15 mm were used to act as substrates during laser cladding process.…”

Section: Methodsmentioning

confidence: 99%

High-throughput screening of laser additive manufactured metallic glass via ultrasonic wave

Zhai

Zhao

et al. 2019

Sci Rep

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Laser additive manufacturing (LAM) technology provides an opportunity to fabricate bulk metallic glasses (BMGs) without any dimensional constraint and achieve the large-scale applications of BMGs. However, flaws, such as cracks, gas porosity, and crystalline phases, are always formed accompanied by the process of LAM, which seriously worsens the mechanical and physical properties of the resulting BMGs. Here, we present a novel method that involves ultrasonic wave technique to high-throughput screen the optimum process parameters for the LAM of BMG. A parameter library, constituted by a series of rectangular BMG samples, is rapidly fabricated by the LAM method under continuously changed combinations of laser power and travel speed. The ultrasonic attenuation factor, which is sensitive to the flaws, is used as the monitor to screen the parameters of the BMGs fabricated by the LAM. Using this approach, the laser power of 1300 W and travel speed of 600 mm/min are estimated as the optimum parameter combination for the LAM of a Zr51Ti5Ni10Cu25Al9 (Zr51) BMG with the slightest flaws. The amorphous-phase dominated microstructure and the sufficiently high tensile strength of the subsequent fabricated large-sized Zr51 BMG sample verify this optimum parameter combination.

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Section: Methodsmentioning

confidence: 99%

High-throughput screening of laser additive manufactured metallic glass via ultrasonic wave

Zhai

Zhao

et al. 2019

Sci Rep

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“…Fine BCC grains were found distributed at the grain boundaries of the FCC matrix when Gao et al [ 137 ] fabricated a CoCrFeMnNi HEA using laser 3D printing technology. This is in contrast with the single-phase FCC achieved by Kucza et al [ 14 ] Tsai, et al [ 92 ], Pickering et al [ 11 ], and Yao et al [ 46 ], who that processed the same HEA using different forms of melting and casting routes.…”

Section: Microstructural Evolution Of Heas Fabricated By Additive Manufacturing (Am)mentioning

confidence: 99%

“…It can be deduced that the synthesis route has little or no influence on the HEA microstructure. This was the case when the noble cantor alloy CoCrFeNiMn maintained an FCC phase when processed through melting and casting [ 11 , 46 ] as well as MA + SPS [ 192 ], but the FCC + BCC phase was reported when fabricated via AM technology [ 137 , 146 , 147 ]. AlCoCrCuFeNi was also fabricated using the melting and casting route [ 64 ] as well as the MA + SPS route [ 189 ], both resulting in an FCC + BCC phase.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Synthesis Route, Microstructural Evolution, and Mechanical Property Relationship of High-Entropy Alloys (HEAs): A Review

et al. 2021

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Microstructural phase evolution during melting and casting depends on the rate of cooling, the collective mobility of constituent elements, and binary constituent pairs. Parameters used in mechanical alloying and spark plasma sintering, the initial structure of binary alloy pairs, are some of the factors that influence phase evolution in powder-metallurgy-produced HEAs. Factors such as powder flowability, laser power, powder thickness and shape, scan spacing, and volumetric energy density (VED) all play important roles in determining the resulting microstructure in additive manufacturing technology. Large lattice distortion could hinder dislocation motion in HEAs, and this could influence the microstructure, especially at high temperatures, leading to improved mechanical properties in some HEAs. Mechanical properties of some HEAs can be influenced through solid solution hardening, precipitation hardening, grain boundary strengthening, and dislocation hardening. Despite the HEA system showing reliable potential engineering properties if commercialized, there is a need to examine the effects that processing routes have on the microstructure in relation to mechanical properties. This review discusses these effects as well as other factors involved.

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“…The high-temperature oxidation process of high-entropy alloys is most commonly performed in a vacuum arc furnace [90][91]. High-entropy alloys are also prepared by mechanical alloying [92][93], laser cladding [68,94], magnetron sputtering [95][96][97][98][99], and 3D printing [100]. High-entropy alloys proves the high-temperature oxidation resistance.…”

Section: Effect Of the Preparation Process On High-temperature Oxidation Of High-entropy Alloysmentioning

confidence: 99%

Influencing factors and mechanism of high-temperature oxidation of high-entropy alloys: A review

Pan

et al. 2021

Int J Miner Metall Mater

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High-temperature oxidation is a common failure in high-temperature environments, which widely occur in aircraft engines and aerospace thrusters; as a result, the development of anti-high-temperature oxidation materials has been pursued. Ni-based alloys are a common high-temperature material; however, they are too expensive. High-entropy alloys are alternatives for the anti-oxidation property at high temperatures because of their special structure and properties. The recent achievements of high-temperature oxidation are reviewed in this paper. The high-temperature oxidation environment, temperature, phase structure, alloy elements, and preparation methods of high-entropy alloys are summarized. The reason why high-entropy alloys have anti-oxidation ability at high temperatures is illuminated. Current research, material selection, and application prospects of high-temperature oxidation are introduced.

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Laser 3D printing of CoCrFeMnNi high-entropy alloy

Cited by 74 publications

References 19 publications

High-throughput screening of laser additive manufactured metallic glass via ultrasonic wave

High-throughput screening of laser additive manufactured metallic glass via ultrasonic wave

Synthesis Route, Microstructural Evolution, and Mechanical Property Relationship of High-Entropy Alloys (HEAs): A Review

Influencing factors and mechanism of high-temperature oxidation of high-entropy alloys: A review

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