Microstructure, Properties, and Metallurgical Defects of an Equimolar CoCrNi Medium Entropy Alloy Additively Manufactured by Selective Laser Melting

Niu, Pengda; Li, Ruidi; Gan, Kefu; Yuan, Tiechui; Xie, Siyao; Chen, Chao

doi:10.1007/s11661-020-06121-4

Cited by 52 publications

(13 citation statements)

References 50 publications

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“…The formation of the cracks was close to the residual stress formed during rapid fabrication. When the energy input was higher, it would result in a higher cooling rate and temperature gradient, thus producing higher thermal stress, which induced further crack formation [ 37 ].…”

Section: Discussionmentioning

confidence: 99%

Effects of Different Substrates on the Formability and Densification Behaviors of Cemented Carbide Processed by Laser Powder Bed Fusion

2021

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Cemented carbide materials are widely applied in cutting tools, drill tools, and mold fabrication due to their superior hardness and wear resistance. Producing cemented carbide parts via the laser powder bed fusion (L-PBF) method has the advantage of fabricating complex structures with a rapid manufacturing speed; however, they were underdeveloped due to their low density and crack formation on the blocks. This work studied the effect of different substrates including 316L substrates, Ni200 substrates, and YG15 substrates on the forming quality of WC-17Co parts fabricated by L-PBF, with the aim of finding the optimal substrate for fabrication. The results revealed that the Ni200 substrates had a better wettability for the single tracks formation than other substrates, and bonding between the built block and the Ni200 substrate was firm without separation during processing with a large range of laser energy inputs. This guaranteed the fabrication of a relatively dense block with fewer cracks. Although the high laser energy input that led to fine crack formation on the blocks formed on the Ni200 substrate, it was found to be better suited to restricting cracks than other substrates.

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Section: Discussionmentioning

confidence: 99%

Effects of Different Substrates on the Formability and Densification Behaviors of Cemented Carbide Processed by Laser Powder Bed Fusion

2021

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“…(1) Additive manufacturing (AM): The alloys discussed above were as cast. In recent years, AM technology has been gradually used to prepare HEAs [38,[79][80][81] . AM technology is more efficient and versatile and can directly prepare parts with complex structures.…”

Section: Preparation Methodsmentioning

confidence: 99%

“…This preparation method is known to improve the strength of the alloys. The high YS of the as-built state alloy was derived from the combined effects of lattice friction stress, boundary strengthening and dislocation strengthening [79] . Interestingly, the SFE of the CoCrNi alloy prepared by AM was lower than the as-cast one [38] .…”

Section: Preparation Methodsmentioning

confidence: 99%

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A critical review of the mechanical properties of CoCrNi-based medium-entropy alloys

Xu¹,

Wang²,

Li³

et al. 2022

Microstructures

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The CoCrFeMnNi alloy is one of the most notable first-generation high-entropy alloys and is also known as a Cantor alloy. This alloy was first proposed in 2004 and shows promising performance at cryogenic temperatures (CTs). Subsequent research has indicated that the equiatomic ternary CoCrNi medium-entropy alloy (MEA), as a subset of the Cantor alloy family, has better mechanical properties than the CoCrFeMnNi alloy. Interestingly, both the strength and ductility of the CoCrNi MEA are higher at CTs than at room temperature. CoCrNi-based alloys have attracted considerable attention in the metallic materials community and it is therefore important to generalize and summarize the latest progress in CoCrNi-based MEA research. The present review initially briefly introduces the discovery of the CoCrNi MEA. Subsequently, its tensile response and deformation mechanisms are summarized. In particular, the effects of parameters, such as critical resolved shear stress, stacking fault energy and short-range ordering, on the deformation behavior are discussed in detail. The methods for strengthening the CoCrNi MEA are then reviewed and divided into two categories, namely, modifying microstructures and adjusting chemical compositions. In addition, the mechanical performance of CoCrNi-based MEAs, including their dynamic shear properties, creep behavior and fracture toughness, is also deliberated. Finally, the development prospects of CoCrNi-based MEAs are proposed.

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“…There are plenty of PBF‐L alloys having a cellular structure where the dislocations are accumulated along the cellular structure boundary, such as PBF‐L 306L, PBF‐L Al12Si, PBF‐L AlMg10Si, PBF‐L CCM alloys, and PBF‐L AgCu alloys. [ 125–132 ] In such cases, the length scale of the cellular structures ( s ) controls the overall strengthening level. Then the dislocation strengthening due to dislocation cell walls can be given as [ 133 ]

Δ σ_{cellular} = k_{normald} / \sqrt{s}

where k d is the dislocation strengthening coefficient for the cellular structure.…”

Section: Strengthening Mechanismsmentioning

confidence: 99%

Additive Manufacturing of Aluminum‐Based Metal Matrix Composites—A Review

et al. 2021

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Aluminum metal matrix composites (AMMCs) offer the potential to combine the advantages of both the aluminum alloys (low density and high ductility) and the reinforcements (high strength and high elastic modulus [EM]), therefore show superior specific strength, high specific stiffness, low coefficient of thermal expansion (CTE), and outstanding wear resistance. [1,2] Therefore, AMMCs meet the rapidly growing demand of advanced lightweight materials in many industrial areas such as automotive, aerospace, marine, and military. Traditionally, AMMCs are produced by two processing routes: melt processing or powder metallurgy. Although such composites are already in use in the aerospace and automobile sectors, many challenges in both melt and powder metallurgy processing routes prevent their widespread applications. The main challenges associated with the melt processing route are heterogeneous distribution of reinforcement leading to aggregation (due to the poor wettability of reinforcement), detrimental reactions at the interface (due to the high temperature of melt and a long dwell time of reinforcement in the melt), and difficulty in subsequent machining (due to the presence of hard second-phase particles). On the contrary, powder metallurgy processed AMMCs are prone to high levels of porosity and inferior mechanical properties leading to premature failure of the components. [3][4][5][6][7] In this context, additive manufacturing (AM) methods such as laser-based powder bed fusion (PBF-L), electron beam-based

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Microstructure, Properties, and Metallurgical Defects of an Equimolar CoCrNi Medium Entropy Alloy Additively Manufactured by Selective Laser Melting

Cited by 52 publications

References 50 publications

Effects of Different Substrates on the Formability and Densification Behaviors of Cemented Carbide Processed by Laser Powder Bed Fusion

Effects of Different Substrates on the Formability and Densification Behaviors of Cemented Carbide Processed by Laser Powder Bed Fusion

A critical review of the mechanical properties of CoCrNi-based medium-entropy alloys

Additive Manufacturing of Aluminum‐Based Metal Matrix Composites—A Review

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