AlCoCuFeNi high-entropy alloy with tailored microstructure and outstanding compressive properties fabricated via selective laser melting with heat treatment

Zhang, Mina; Zhou, Xianwei; Wang, Dafeng; Zhu, Wuzhi; Li, Jinghao; Zhao, Yaoyao Fiona

doi:10.1016/j.msea.2018.11.118

Cited by 91 publications

(37 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…FCC is Figure 6. Microstructural approach through a schematic illustration (made from [24,51,[53][54][55][56][57][58][59]) for the "as built" AlCoCrFeNi and EBMed near the equilibrium conditions and rapid cooled. The magnification mark is arbitrary due to the different papers used, but is in the range of 2-15 µm.…”

Section: Microstructural Analysis Of the Additive Manufactured Alloysmentioning

confidence: 99%

“…When the amounts of Al and Ni are in a good balance, BCC is the formed microstructure, with the prevalence of the B2 ordered phase [60] (LENS). The FCC phase is precipitated at the grain boundaries only after annealing at high temperature (FCC phases were precipitated in larger quantities in the sample that was heat-treated at 1000 • C) [54] (SLM).…”

Section: Microstructural Analysis Of the Additive Manufactured Alloysmentioning

confidence: 99%

See 1 more Smart Citation

High Entropy Alloys Manufactured by Additive Manufacturing

Torralba

Campos

2020

Metals

View full text Add to dashboard Cite

High entropy alloys have attracted much interest over the last 16 years due to their promising an unusual properties in different fields that offer many new possible application. Additionally, additive manufacturing has drawn attention due to its versatility and flexibility ahead of a new material challenge, being a suitable technology for the development of metallic materials. Moreover, high entropy alloys have demonstrated that many gaps exist in the literature on its physical metallurgy, and in this sense, additive manufacturing could be a feasible technology for solving many of these challenges. In this review paper the newest literature on this topic is condensed into three different aspects: the different additive manufacturing technologies employed to process high entropy alloys, the influence of the processing conditions and composition on the expected structure and microstructure and information about the mechanical and corrosion behavior of these alloys.

show abstract

Section: Microstructural Analysis Of the Additive Manufactured Alloysmentioning

confidence: 99%

Section: Microstructural Analysis Of the Additive Manufactured Alloysmentioning

confidence: 99%

High Entropy Alloys Manufactured by Additive Manufacturing

Torralba

Campos

2020

Metals

View full text Add to dashboard Cite

show abstract

“…[23] Joseph et al prepared an AlxCoCrFeNi alloy by laser deposition, which showed a significant asymmetry of tensile/compression. [24,25] Since then, different series of HEAs, such as FeMnCoCrNi, [26][27][28][29] AlCoCrFeNi, [30] AlCrCuFeNi, [31] AlCoCuFeNi, [32] and CoCrFeNiTi, [33] have been successfully fabricated using AM. Unfortunately, although the CoCrNi MEA has excellent mechanical properties, few studies have been done on the AM process for such alloys till now.…”

Section: Introductionmentioning

confidence: 99%

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

Niu

Gan

et al. 2021

Metall Mater Trans A

View full text Add to dashboard Cite

Additive manufacturing of an equimolar CoCrNi medium entropy alloy (MEA) by selective laser melting (SLM) was investigated, emphasizing its microstructure, properties, and metallurgical defects. It was found that SLM sample density exhibited a non-monotonic relation with their volume energy density (VED); the density first increased but then decreased while the input VED was gradually increasing. A maximal relative density of 98.9 pct was accessible at a VED of 83.3 J/mm 3. X-ray diffraction indicated that the printed CoCrNi MEA exhibited an FCC single-crystal structure where the lattice constant decreased with the increasing VED owing to the evaporation of the Cr element in the SLM process. The average grain size gradually increased with increasing VED, irrespective of whether viewed from the top or the side of the printed part. Similarly, the residual stress increased with increasing VED, which produced more microcracks and deteriorated the tensile preformation of the printed samples, although the yield strength (630 MPa) showed no apparent difference at different VEDs. Owing to the ultrafine cell structure, the mechanical property of the SLM printed sample was twice that of cast or wrought CoCrNi MEA.

show abstract

“…Selective laser melting (SLM), a flexible additive manufacturing technique, provides great potential to directly fabricate HEAs with improved comprehensive properties [15,16]. Currently, SLM-fabricated FCC HEAs including FeCoCrNi [17,18], Al 0.5 CoCrFeNi [19], CoCrFeNiMn [20][21][22] and C-containing CoCrFeNi [23,24], as well as BCC HEAs including AlCoCuFeNi [25], AlCrCuFeNi [26] and AlCoCrFeNi [27], have been widely studied by researchers. Recently, for the first time, FCC plus BCC AlCrCuFeNi x DP-HEAs were produced successfully by using SLM and the crack-free AlCrCuFeNi 3 DP-HEA was acquired [28].…”

Section: Introductionmentioning

confidence: 99%

“…Also, the SLM-built AlCrCuFeNi 3 DP-HEA possesses a hierarchically heterogeneous microstructure and enhanced strength-ductility combination. However, a fast cooling rate and steep thermal gradient easily lead to cracking and performance degradation for SLM-built HEAs containing the BCC-structured phase [25,26]. Why the cracks can be effectively eliminated in the SLM-built FCC plus BCC AlCrCuFeNi 3 DP-HEA is not clear.…”

Section: Introductionmentioning

confidence: 99%

Tailored microstructures and strengthening mechanisms in an additively manufactured dual-phase high-entropy alloy via selective laser melting

Luo

Wang

2020

Sci. China Mater.

View full text Add to dashboard Cite

Dual-phase high-entropy alloys (DP-HEAs) with excellent strength-ductility combinations have attracted scientific interests. In the present study, the microstructures of AlCrCuFeNi 3.0 DP-HEA fabricated via selective laser melting (SLM) are rationally adjusted and controlled. The mechanisms engendering the hierarchical microstructures are revealed. It is found that the AlCrCuFeNi 3.0 fabricated by SLM at the scanning speed of 400 mm s −1 falls into the eutectic coupled zone, and increasing the scanning speed will make this composition deviate away from the eutectic coupled zone due to the increased cooling rate. The enrichment of Cr and Fe solutes with large growth restriction values ahead of the solid/ liquid interface can develop a constitutional supercooling zone, thus facilitating the heterogeneous nucleation and nearequiaxed grain formation. The synergy of the near-eutectic DP nano-structures and near-equiaxed grains instead of columnar ones effectively suppresses cracking for the as-built DP-HEA.During the tensile deformation, the intergranular back stress hardening similar to the grain-boundary strengthening is discovered. Meanwhile, the near-eutectic microstructures comprised of soft face-centered cubic and hard ordered bodycentered cubic (B2) DP nano-structures lead to plastic strain incompatibility within grains, thus producing the intragranular back stress. The Cr-rich nano-precipitates inside the B2 phase are found to be sheared by dislocation gliding and can complement the back stress. Additionally, multiple strengthening mechanisms are physically evaluated, and the back stress strengthening contributes obviously to the high performances of the as-built DP-HEA.

show abstract

AlCoCuFeNi high-entropy alloy with tailored microstructure and outstanding compressive properties fabricated via selective laser melting with heat treatment

Cited by 91 publications

References 34 publications

High Entropy Alloys Manufactured by Additive Manufacturing

High Entropy Alloys Manufactured by Additive Manufacturing

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

Tailored microstructures and strengthening mechanisms in an additively manufactured dual-phase high-entropy alloy via selective laser melting

Contact Info

Product

Resources

About