Nano-scale heterogeneity-driven metastability engineering in ferrous medium-entropy alloy induced by additive manufacturing

Park, Jeong Min; Asghari‐Rad, Peyman; Zargaran, Alireza; Bae, Jae Wung; Moon, Jongun; Kwon, Hyuk-Sung; Choe, Jungho; Yang, Sangsun; Yu, Juan; Kim, Hyoung Seop

doi:10.1016/j.actamat.2021.117426

Cited by 82 publications

(19 citation statements)

References 45 publications

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“…Moreover, it could also be found that the intensity of in-grain misorientation axis distribution (IGMA) around the <0001> axis increased in ROZ@Zn than that in bare Zn (Figure 2c), implying that the preparation process of ROZ coating was favorable to the more (001) planes exposing. [27] It may be related to the heterogeneous reaction activation of the different crystal planes to H + ionized by acetic acid in sol-gel solution. To further explore the reason of crystal plane reconstruction, density of function (DFT) calculations were carried out.…”

Section: The Characteristics and Crystal Plane Reconstruction Of Roz@...mentioning

confidence: 99%

Crystal Plane Reconstruction and Thin Protective Coatings Formation for Superior Stable Zn Anodes Cycling 1300 h

Liu

Cai

et al. 2022

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820 mAh g −1 ), which is attractive as the anode for aqueous batteries. [1] Based on these advantages, various zinc-metal batteries employing aqueous electrolyte with high safety (such as Zn-ion batteries, Zn-air batteries, and Zn-redox-flow batteries) have been intensively investigated. [2] Unfortunately, the poor chemical stability and electrochemical irreversibility of the Zn metal anode limit the practical applications of Zn rechargeable batteries. [3] Undesired side reactions and dendrite growth are two main challenges for aqueous Zn metal batteries.The nonuniform Zn 2+ flux of the interfacial layer on Zn can cause variations in the localized current density and ion depletion during cycling, thus resulting in large overpotentials and dendrite growth. [4] Continued dendrite growth can lead to penetration of the separator and cause short circuiting of cells. Moreover, nonuniform Zn plating/stripping may lead to further undesired side reactions between Zn and aqueous electrolytes. [5] To solve this problem, the interfacial coatings on the Zn surface are used to regulate Zn 2+ flux and suppress Zn dendrite growth, which finally avoids the well-known "tip effect." [6] In addition, the texture designs of the Zn metal surface play an important role in the orientation of the zinc crystal by plating. [7] Due to the smooth equipotential surface of Zn-(001) planes and the stronger adsorption energy of parallel direction between the (001) plane surface and Zn atom, the (001) crystal plane can guide plating sequentially parallel to it. [8] For example, Archer's group and Liang's group reported that the Zn foil exhibiting a preferred (001) texture by plastic deformation could suppress the rough plating/stripping landscape and promote uniform deposition along (001) planes. [9] Undesirable side reactions including chemical corrosion and hydrogen evolution mainly occurred at the interface between the Zn metal surface and electrolytes. [10] They would block the utilization of Zn, and then lead to electrolytes consumption and low Coulombic efficiency. [11] To solve this problem, various kinds of coatings have been made, which mainly include inorganic coating, polymer coating, organic, and inorganic composite coating. [12] They could block water molecules from reaching the Zn surface, and then improve the stability and reversibility of Zn metal anode. [13] However, thicker coatings were usually chosen to guarantee long-acting anticorrosion effect and retard the growth of dendrites, which meant the long route of ionic Some new insights into traditional metal pretreatment of anticorrosion for high stable Zn metal anodes are provided. A developed pretreatment methodology is employed to prefer the crystal plane of polycrystalline Zn and create 3.26 µm protective coatings mainly consisting of organic polymers and zinc salts on Zn foils (ROZ@Zn). In this process, Zn metal exhibits a surface-preferred (001) crystal plane proved by electron backscattered diffraction. Preferred (001) crystal planes and ROZ coatings can regulate ...

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Section: The Characteristics and Crystal Plane Reconstruction Of Roz@...mentioning

confidence: 99%

Crystal Plane Reconstruction and Thin Protective Coatings Formation for Superior Stable Zn Anodes Cycling 1300 h

Liu

Cai

et al. 2022

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“…It is reasonable that the scatter of Fe concentration in the present in situ alloyed samples is larger than that in the as‐printed sample fabricated with prealloyed powders in ref. [41]. But the proportion of transformed BCC phase appears not enough to induce TRIP effect during the room temperature tension, as can be seen from the corresponding strain hardening rate versus true strain curve of the as‐printed sample (Figure 11b), in which no rise of the strain hardening rate is observed at the plastic stain region.…”

Section: Resultsmentioning

confidence: 92%

“…As shown in Figure 12c, there was certain proportion of BCC phase (about 27%) formed in the sample failing at 298 K, which could be caused by the scattered Fe concentration in the present in situ alloyed samples. Park et al [ 41 ] reported that even a little variation of Fe concentration (about 1% larger) in the cell walls of the as‐printed Fe 60 Co 15 Ni 15 Cr 10 alloy can lead to the FCC‐BCC transformation under room temperature loading that does not occur for the casted counterparts. It is reasonable that the scatter of Fe concentration in the present in situ alloyed samples is larger than that in the as‐printed sample fabricated with prealloyed powders in ref.…”

Section: Resultsmentioning

confidence: 99%

“…This is comparable to that (99.95%) of the corresponding sample produced with prealloyed powder. [ 41 ] Figure 6b–g shows the distribution of pores on the polished surface of samples 20–100‐rs, 20–250‐rs, 40–250‐rs, 40–250‐ss, 40–320‐ss, and 40–380‐ss, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…This is comparable to that (99.95%) of the corresponding sample produced with prealloyed powder. [41] From the entire melting pool morphology shown in Figure 2 and 7, it can be seen that except for the sample 20-100-rs dominated by the convection mode, the melting pools in the rest of samples consist of two parts: the depression-dominated zone at the upside and the convection-dominated zone at the downside, [19] as outlined by the red broken curve and white curve in Figure 7. The former had keyhole due to the recoil pressure and the latter maintained liquid convection with few pores during melting.…”

Section: Mechanism Of Pore Elimination During In Situ Alloying Processmentioning

confidence: 99%

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In situ Alloyed Medium Entropy Alloy Fabricated by Laser Powder Bed Fusion: Microstructure and Cryogenic Performance

Jia

et al. 2022

Adv Eng Mater

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An investigation is conducted into the feasibility to produce in situ alloyed medium entropy alloy containing four principal elements by laser powder bed fusion of the blended elemental powders. The effect of scan strategy, layer thickness, and laser power on in situ alloying is examined. It is revealed that the melting of Cr particles could be enhanced by increasing the remelting times of each building layer through the re‐scan strategy or reducing the powder layer thickness and by increasing the melting pool depth via large laser power. Besides, the combination of elemental uniformity and the low porosity in the printed alloy can be achieved. The accuracy of the nominal composition in the as‐printed sample could be ensured by the large remelting times combined with middle laser power, while an excessively large laser power could cause the loss of Cr element. Based on the high repetitive remelting process, the mechanism of pores elimination during in situ alloying is discussed. After the optimization, the as‐printed Fe60Co15Ni15Cr10 alloy fabricates with the re‐scan strategy or high laser power shows a tensile strength of ≈1140 MPa and an elongation of ≈0.39 under cryogenic loading. The as‐printed alloy overcomes the strength–ductility trade‐off at cryogenic temperature through the transformation‐induced plasticity.

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Additive Manufacturing of Nanoscale and Microscale Materials

Vasanth Kumar,

Srinivasan,

Davis Hans

et al. 2024

Additive Manufacturing With Novel Materials

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Nano-scale heterogeneity-driven metastability engineering in ferrous medium-entropy alloy induced by additive manufacturing

Cited by 82 publications

References 45 publications

Crystal Plane Reconstruction and Thin Protective Coatings Formation for Superior Stable Zn Anodes Cycling 1300 h

Crystal Plane Reconstruction and Thin Protective Coatings Formation for Superior Stable Zn Anodes Cycling 1300 h

In situ Alloyed Medium Entropy Alloy Fabricated by Laser Powder Bed Fusion: Microstructure and Cryogenic Performance

Additive Manufacturing of Nanoscale and Microscale Materials

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