Significance of grain refinement on micro-mechanical properties and structures of additively-manufactured CoCrFeNi high-entropy alloy

Zhao, Wenrui; Han, Jae-Kyung; Kuzminova, Yulia O.; Evlashin, Stanislav A.; Zhilyaev, Alexander P.; Pesin, Alexander; Jang, Jae-il; Liss, Klaus-Dieter; Kawasaki, Megumi

doi:10.1016/j.msea.2021.140898

Cited by 68 publications

(15 citation statements)

References 76 publications

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“…As was discussed in recent studies on AM f.c.c. metals including a 316L stainless steel [ 20 ] and a CoCrFeNi high‐entropy alloy, [ 26 ] microstructural refinement by HPT introduced dislocation‐induced anisotropy during the severe structural evolution. In practice, an application of the Williamson–Hall method provided large scatters between the data points taken at the coordinates of either the close‐packed planes or out‐of‐close‐packed planes when plotting the full width at half maximum (FWHM), Δ Q , of the obtained diffraction peak profiles against the scattering vector, Q .…”

Section: Discussionmentioning

confidence: 99%

“…Such structural variations introduced by nanostructuring can be elucidated by the predominant nano-mechanical deformation behavior of the grain boundary-mediated dislocation activity in the nanostructured f.c.c. metals including ultrafine-grained high-entropy alloys [26,60,61] and Ni alloys, [61] which are estimated by nanoindentation.…”

Section: Structural Evolution During Nanostructuringmentioning

confidence: 99%

“…A recent study using an HPT‐processed AM CoCrFeNi high‐entropy alloy demonstrated the improved strain hardenability in comparison with the conventionally manufactured cast counterpart after HPT. [ 26 ] Nevertheless, no study on thermal behaviors is reported for nanostructured AM alloys.…”

Section: Introductionmentioning

confidence: 99%

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In Situ Heating Neutron and X‐Ray Diffraction Analyses for Revealing Structural Evolution during Postprinting Treatments of Additive‐Manufactured 316L Stainless Steel

et al. 2021

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Herein, lab‐scale X‐ray diffraction and in situ heating neutron diffraction analyses for evaluating the structural changes at postprinting nanostructuring and structural relaxation upon heating, respectively, in an additive‐manufactured (AM) 316L stainless steel are conducted. The nanostructured AM steel after nanostructuring by high‐pressure torsion reached crystallite sizes of 23–26 nm, a dislocation density of ≈45 × 1014 m−2 and a microstrain of >0.008. A limited amount of deformation‐induced ε‐martensite was observed at a local region in the nanostructured AM steel. The time‐resolved neutron diffraction experiment upon heating successfully visualizes the sequential structural relaxation and linear thermal lattice expansion in the nanostructured AM steel. In practice, by calculating the changes in crystallite sizes, microstrains, and dislocation densities, the relaxation behaviors of the nanocrystalline AM steel is observed: 1) recovery with slow stress relaxation with increasing hardness up to 873 K, 2) recrystallization with accelerated stress relaxation at 873–973 K; and 3) grain growth above 973 K with (iii′) total stress relaxation in lattices up to 1023 K. In addition, this manuscript makes connections between the critical subjects in materials science of advanced manufacturing, metal processing and properties, and novel time‐resolved characterization techniques.

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Section: Discussionmentioning

confidence: 99%

Section: Structural Evolution During Nanostructuringmentioning

confidence: 99%

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In Situ Heating Neutron and X‐Ray Diffraction Analyses for Revealing Structural Evolution during Postprinting Treatments of Additive‐Manufactured 316L Stainless Steel

et al. 2021

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“…Synthesis of CoCrFeMnNi alloys is common by the AM process due to their nature with a ductile fcc structure as matrix, which provides stable printability [19][20][21]. A CrFeCoNi alloy also demonstrates the same or even better properties than the five-component alloy [22][23][24][25]. The four-component system is actively explored for composition modification by the AM process [26,27].…”

Section: Introductionmentioning

confidence: 99%

Phase and structural changes during heat treatment of additive manufactured CrFeCoNi high-entropy alloy

Kuzminova

Kudryavtsev

Han

et al. 2021

Journal of Alloys and Compounds

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“…Apart from SPS, SLM is the most widely studied AM technique for HEAs . HEAs that were successfully fabricated by SLM include CoCrFeNiMn [153,154,169,[176][177][178][179][180][181][182][183][184][185]188,[202][203][204][205][206]209,212,214,215,217,220,221], AlCrFeNiV [193], AlCoCrFeNi [170,190], Al-CoCrCuFeNi [194], CoCrFeNi [98,155,186,187,189,208,213,222], CoCr 2.5 FeNi 2 TiW 0.5 [223],…”

Section: Additive Manufacturing Of Heasmentioning

confidence: 99%

Recent Advances in Additive Manufacturing of High Entropy Alloys and Their Nuclear and Wear-Resistant Applications

Sonal

Lee

2021

Metals

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Alloying has been very common practice in materials engineering to fabricate metals of desirable properties for specific applications. Traditionally, a small amount of the desired material is added to the principal metal. However, a new alloying technique emerged in 2004 with the concept of adding several principal elements in or near equi-atomic concentrations. These are popularly known as high entropy alloys (HEAs) which can have a wide composition range. A vast area of this composition range is still unexplored. The HEAs research community is still trying to identify and characterize the behaviors of these alloys under different scenarios to develop high-performance materials with desired properties and make the next class of advanced materials. Over the years, understanding of the thermodynamics theories, phase stability and manufacturing methods of HEAs has improved. Moreover, HEAs have also shown retention of strength and relevant properties under extreme tribological conditions and radiation. Recent progresses in these fields are surveyed and discussed in this review with a focus on HEAs for use under extreme environments (i.e., wear and irradiation) and their fabrication using additive manufacturing.

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Significance of grain refinement on micro-mechanical properties and structures of additively-manufactured CoCrFeNi high-entropy alloy

Cited by 68 publications

References 76 publications

In Situ Heating Neutron and X‐Ray Diffraction Analyses for Revealing Structural Evolution during Postprinting Treatments of Additive‐Manufactured 316L Stainless Steel

In Situ Heating Neutron and X‐Ray Diffraction Analyses for Revealing Structural Evolution during Postprinting Treatments of Additive‐Manufactured 316L Stainless Steel

Phase and structural changes during heat treatment of additive manufactured CrFeCoNi high-entropy alloy

Recent Advances in Additive Manufacturing of High Entropy Alloys and Their Nuclear and Wear-Resistant Applications

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