Deformation mechanisms in an additively manufactured dual-phase eutectic high-entropy alloy

Ren, Jie; Wu, Margaret; Li, Chenyang; Guan, Shuai; Dong, Jiaqi; Forien, Jean‐Baptiste; Li, Tianyi; Shanks, Katherine S.; Yu, Dunji; Chen, Yan; An, Ke; Xie, Kelvin; Chen, Wei; Voisin, Thomas; Chen, Wen

doi:10.1016/j.actamat.2023.119179

Cited by 16 publications

(6 citation statements)

References 82 publications

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“…The significantly refined micro-architecture by LPBF is consistent with the expected one due to the rapid solidification processing environment [33]. The greatly refinement in LPBF sample arises significant interfacial density boosting, which presumably leads to the more pronounced composite coupling effect during deformation and confers remarkable enhancement in performances [34,35]. In addition, under the nonequilibrium conditions of LPBF, the composite architecture exhibits short aspect ratios compared to the as-cast counterpart, endowing the integral microstructure and performance isotropized.…”

Section: Micro-architectures Of Hierarchical Compositessupporting

confidence: 71%

“…In addition, the LPBF process has an ultra-rapid solidification of more than 10 4 • Cs −1 [30][31][32], which is tens of thousands of times more than that of conventional casting. Under such processing conditions, it is found that, for various metallic in-situ composites, the conspicuous refinement of multiphase grain size shows a promotion for mechanical performances [33][34][35]. This microstructural refinement is bound to rise soft-hard interfacial density dramatically.…”

Section: Introductionmentioning

confidence: 99%

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Endowing low fatigue for elastocaloric effect by refined hierarchical microcomposite in additive manufactured NiTiCuCo alloy

Feng,

Liu,

Yang

et al. 2024

Int. J. Extrem. Manuf.

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NiTiCu-based shape memory alloys have been considered as ideal materials for solid-state refrigeration due to their superb cycling stability for elastocaloric effect. However, the embrittlement and deterioration resulted from coarse grains and large-sized secondary phase restrict their application, and it is still challenging since the geometry is required. Here, bulk NiTiCuCo parts with excellent forming quality were fabricated by laser powder bed fusion (LPBF) technique. The as-fabricated alloy exhibits a refined three-phases hierarchical microcomposites structure formed based on the processing mode of LPBF, in which intricate dendritic Ti2Ni-NiTi composites and nano Ti2Cu uniformly embedded inside the NiTi-matrix. This configuration endows far superior elastocaloric stability compared to the cast counterpart. The low fatigue stems from the strong elastic coupling between the interphase with reversible martensite transformation inside the refined microcomposites, revealed by in-situ synchrotron high-energy X-ray diffraction. The fabrication of NiTiCuCo alloy via LPBF fill the bill of complex geometric structures for elastocaloric NiTiCu alloys. The interphase coupling micro-behaviors provide the guide for the design LPBF fabricated shape memory-based composites, enabling their applications with special demands on other functionalities.

show abstract

Section: Micro-architectures Of Hierarchical Compositessupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Endowing low fatigue for elastocaloric effect by refined hierarchical microcomposite in additive manufactured NiTiCuCo alloy

Feng,

Liu,

Yang

et al. 2024

Int. J. Extrem. Manuf.

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“…5 . According to reference 18 , the ordered B2 structure can be formed in the as-printed sample. Considering that either Al or Ni typically favors the FCC phase, it is reasonable to hypothesize that the disruption of the B2 ordered structure during the BCC to FCC phase transition may stabilize the resulting FCC phase, leading to irreversibility.…”

Section: Resultsmentioning

confidence: 99%

“…In metals and alloys, the transition between body-centered cubic (BCC) and face-centered cubic (FCC) crystal structures and its reverse process stand out for their significance 15 , 16 . The reversible FCC–BCC phase transitions are utilized to create diverse material classes, such as steels 4 , catalysts 12 , 17 , and high enthalpy alloys 18 , 19 , for varied applications.…”

Section: Introductionmentioning

confidence: 99%

“…Additive manufacturing techniques, such as laser-powder bed fusion (3D-printing), produce far-from-equilibrium micro/nanostructures in compositionally complex alloys, yielding mechanical properties superior to conventional as-cast alloys 18 , 28 . For example, the eutectic high-entropy alloy (EHEA) Ni 40 Co 20 Fe 10 Cr 10 Al 18 W 2 exhibits nanolamellar BCC and FCC phases under ambient conditions, with a yield strength as high as 1.49 GPa and tensile strain exceeding 14% 29 .…”

Section: Introductionmentioning

confidence: 99%

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High-pressure phase transition in 3-D printed nanolamellar high-entropy alloy by imaging and simulation insights

Pope,

Chen,

Chen

et al. 2024

Sci Rep

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We report on the high-resolution imaging and molecular dynamics simulations of a 3D-printed eutectic high-entropy alloy (EHEA) Ni40Co20Fe10Cr10Al18W2 consisting of nanolamellar BCC and FCC phases. The direct lattice imaging of 3D-printed samples shows the Kurdjumov–Sachs (K–S) orientation relation {111} FCC parallel to {110} BCC planes in the dual-phase lamellae. Unlike traditional iron and steels, this alloy shows an irreversible BCC-to-FCC phase transformation under high pressures. The nanolamellar morphology is maintained after pressure cycling to 30 GPa, and nano-diffraction studies show both layers to be in the FCC phase. The chemical compositions of the dual-phase lamellae after pressure recovery remain unchanged, suggesting a diffusion-less BCC–FCC transformation in this EHEA. The lattice imaging of the pressure-recovered sample does not show any specific orientation relation between the two resulting FCC phases, indicating that many grain orientations are produced during the BCC–FCC phase transformation. Molecular dynamics simulations on phase transformation in a nanolamellar BCC/FCC in K–S orientation show that phase transformation from BCC to FCC is completed under high pressures, and the FCC phase is retained on decompression aided by the stable interfaces. Our work elucidates the irreversible phase transformation under static compression, providing an understanding of the orientation relationships in 3-D printed EHEA under high pressures.

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Enhancing the mechanical properties of casting eutectic high-entropy alloys via W addition

Yang,

Chen,

Feng

et al. 2024

Int J Miner Metall Mater

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Deformation mechanisms in an additively manufactured dual-phase eutectic high-entropy alloy

Cited by 16 publications

References 82 publications

Endowing low fatigue for elastocaloric effect by refined hierarchical microcomposite in additive manufactured NiTiCuCo alloy

Endowing low fatigue for elastocaloric effect by refined hierarchical microcomposite in additive manufactured NiTiCuCo alloy

High-pressure phase transition in 3-D printed nanolamellar high-entropy alloy by imaging and simulation insights

Enhancing the mechanical properties of casting eutectic high-entropy alloys via W addition

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