Improving the hydrogen embrittlement resistance of a selective laser melted high-entropy alloy via modifying the cellular structures

Fu, Zhenghong; Yang, Bing; Gan, Kefu; Yan, Dingshun; Li, Zhi Ming; Gou, Guoqing; Chen, Hui; Wang, Zhirui

doi:10.1016/j.corsci.2021.109695

Cited by 59 publications

(20 citation statements)

References 74 publications

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“…For example, as shown in Figure 6A, through hydrogen-induced gradient NT structures, the equiatomic FeCoCrNiMn HEA demonstrated an excellent property combination at 77 K [63] . Furthermore, the gradient-structured FeCoCrNiMn HEA shows both high yield stress (500-700 MPa) and good ductility (15%-33%) under hydrogen environments [Figure 6B], where the gradient structures containing surface NTs are introduced via the surface mechanical attrition treatment technique [66] . Additionally, it was reported that grain refinement can also contribute to improving the HE resistance of equiatomic FeCoCrNiMn and FeCoCrNi HEAs [64,65] .…”

Section: He Mechanisms and Mitigation Strategies In Hea Systemsmentioning

confidence: 99%

Environmental embrittlement behavior of high-entropy alloys

2022

Microstructures

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High entropy alloys (HEAs), as a new class of structural materials, have attracted extensive interest from numerous metallurgical scientists and engineers. Benefiting from their unique microstructural features and outstanding mechanical performance, HEAs have shown significant potential for applications in many engineering fields, even under extreme conditions. In particular, when exposed to hydrogen and/or intermediate-temperature environments, these HEAs inevitably suffer from severe environmental embrittlement (EE) issues, e.g., hydrogen embrittlement (HE) and intermediate-temperature embrittlement (ITE), resulting in serious premature intergranular failure. In this work, we critically review the state-of-the-art advances of EE in previously reported HEA systems. Particular focus is given to novel strategies to enhance the resistance to EE in different HEAs. Two critical embrittlement phenomena, namely, HE and ITE, are highlighted separately. Finally, we provide perspectives on future research directions and opportunities for EE-resistant HEAs.

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Section: He Mechanisms and Mitigation Strategies In Hea Systemsmentioning

confidence: 99%

Environmental embrittlement behavior of high-entropy alloys

2022

Microstructures

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“…Such high strength-sound plasticity achievement in AMed AISI 316L stainless steel and CoCrFeMnNi-HEA is attributed to the presence of cellular structures with high-dislocation density and higher residual strain accommodation at the fusion boundaries. [51][52][53] Even though CoCrFeMnNi-HEA, AISI316L stainless steel, and CoCrFeMnNi-HEA/AISI 316L stainless steel bimetals show similar tensile properties, the bimetals always fracture along the AISI 316L stainless steel side. It is evident from Figure 7a and the inset image that the bimetallic joint (comprising CoCrFeMnNi-HEA, AISI 316L stainless steel, and the interface) follows a similar plastic deformation like AISI 316L stainless steel in terms of strain hardening.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Additive Manufacturing of CoCrFeMnNi High‐Entropy Alloy/AISI 316L Stainless Steel Bimetallic Structures

et al. 2022

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The CoCrFeMnNi high-entropy alloy (HEA) is composed of five principal elements in an equal molar ratio. As the alloy was initially designed by Cantor and his group, this alloy is also named as Cantor alloy more often. [1] In contrast to the traditional alloying concept (i.e., the formation of the complex intermetallic phases and/or compounds during multi-elemental alloying), the CoCrFeMnNi-HEA exhibits a simple microstructure and crystal structure (single face-centered cubic--fcc) even with five equimolar alloying elements. Yeh et al. proposed that the simple phase stabilization in multicomponent alloys can be attributed to the higher configurational entropy in the multicomponent alloy system. [2] Further, heavy lattice distortion and sluggish diffusion effects render the multicomponent alloy superior under mechanical loading, and in corrosive and irradiated environments. [3][4][5][6] Research on the mechanical properties by Otto et al. [7] and Gludovatz et al. [8] has revealed an exceptional damage tolerance of the CoCrFeMnNi-HEA, especially at cryogenic conditions, due to continuous strain hardening by the evolution of nanotwins and nanoscale bridging during deformation. [7,9] The fatigue limit of the CoCrFeMnNi-HEA evaluated after pre-straining at room temperature (550 MPa) as well as at cryogenic temperature (470 MPa) demonstrates

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“…The mixing entropy effect of HEAs is different from that of traditional alloys, such as having high a entropy effect, hysteresis diffusion, lattice distortion and "cocktail" effect [7][8][9]. In addition, the random distribution of multi-component solid solution elements and the addition of easily passivated elements, wear-resistant elements, and oxidation-resistant elements render it better than the traditional metal coating materials in terms of corrosion resistance [10][11][12][13][14], wear resistance [15][16][17][18], and oxidation resistance [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Microstructures, Corrosion Resistance and Wear Resistance of High-Entropy Alloys Coatings with Various Compositions Prepared by Laser Cladding: A Review

Zhu

Guo

et al. 2022

Coatings

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Nowadays, high-entropy alloys (HEAs) have become a hot research topic in the field of coating materials. However, HEAs have a large wide range of compositional systems, and the differences in their composition inevitably lead to the significant variations in the matching process parameters of laser cladding and post-treatment methods, which in turn give the coatings a broad range of microstructures and protective properties. Therefore, it is crucial to review and summarize the research progresses on laser cladding HEA coatings to provide a reference for obtaining high-performance HEA coatings and further expand the application of HEA coatings. This work describes the working mechanism of laser cladding and illustrates the advantages and drawbacks of laser cladding in detail. The effects of the addition of alloying elements, process parameters and post-treatment techniques on the microstructures and properties of the coatings are thoroughly reviewed and analyzed. In addition, the correlations between the chemical compositions of HEAs, process parameters of laser cladding, post-treatment techniques and the microstructure and protective properties of the coatings are investigated and summarized. On this basis, the future development direction of HEA coatings is outlined.

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Improving the hydrogen embrittlement resistance of a selective laser melted high-entropy alloy via modifying the cellular structures

Cited by 59 publications

References 74 publications

Environmental embrittlement behavior of high-entropy alloys

Environmental embrittlement behavior of high-entropy alloys

Additive Manufacturing of CoCrFeMnNi High‐Entropy Alloy/AISI 316L Stainless Steel Bimetallic Structures

Microstructures, Corrosion Resistance and Wear Resistance of High-Entropy Alloys Coatings with Various Compositions Prepared by Laser Cladding: A Review

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