Effects of minor Nb alloying on the thermal stability and mechanical responses of a γ/γ′ type high-entropy alloy with high Fe content

He, Junyang; Li, Na; Makineni, Surendra Kumar; Zhao, Yunsong; Liu, Weihong; Wang, Li; Wang, Zhangwei; Song, Min

doi:10.1016/j.msea.2022.143610

Cited by 10 publications

(2 citation statements)

References 47 publications

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“…On the one hand, the formation of precipitated phases causes the strengthening effect of the second phase. On the other hand, the precipitated phases can also play a role in refining grains [39] . When the Ni content continued to increase to x=1.75, the dimple depth at the fracture site of the sample began to become shallower, and the cleavage area began to increase, indicating a decrease in the ductile fracture of the sample.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Effects of Nickel on the Microstructure, Mechanical properties and Corrosion Resistance of CoCrFeNixAl0.15Ti0.1 High Entropy Alloy

Yang

et al. 2022

Res. Appl. Mater. Sci.

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The present work investigates the effect of Ni on the microstructure, mechanical properties, and corrosion resistance of CoCrFeNixAl0.15Ti0.1 high-entropy alloys. It was found that the appropriate addition of Ni element in the alloy is beneficial to reduce the average grain size of the alloy. The yield strength and tensile strength of the alloy under fine-grain strengthening have also been increased, while the ductility of the system in this study has not been significantly affected. In terms of corrosion resistance, CoCrFeNixAl0.15Ti0.1 high-entropy alloys form a dense passive film at open circuit potential, possessing good corrosion resistance. However, with the excessive addition of Ni content in the alloy, the pitting corrosion resistance of the alloy in the environment of chloride ions will decrease due to the relative decrease of the relative content of Cr element. This work also can provide guidances for the design and development of new precipitation-strengthened CoCrFeNi-based high-entropy alloys with excellent comprehensive properties.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Effects of Nickel on the Microstructure, Mechanical properties and Corrosion Resistance of CoCrFeNixAl0.15Ti0.1 High Entropy Alloy

Yang

et al. 2022

Res. Appl. Mater. Sci.

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“…[ 7,8 ] Niobium can increase the thermal stability of the γ′ phase, and the nanoscale carbides formed by the combination of niobium and carbon in the matrix play a role in strengthening the grain boundaries. [ 9,10 ] Therefore, molybdenum and niobium serve as indispensable elements in Fe–Ni‐based heat‐resistant alloys.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution and Homogenization Kinetics of 15Cr–30Ni–Fe Heat‐Resistant Alloy

Zhang,

Shi,

Wang

et al. 2024

steel research int.

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The as‐cast microstructure, microsegregation of alloying elements, and microstructure evolution during homogenization of the newly designed 15Cr–30Ni–Fe heat‐resistant alloy are studied. Ti, Nb, Si, and Mo segregate at the interdendritic region. The brittle eutectic Laves phase contains Fe, Ti, Ni, Nb, Si, and Mo, which is identified as the Fe2Ti Laves phase. The activation energy for the Fe2Ti Laves phase dissolution is close to the activation energy for Ti diffusion in the γ matrix based on the Johnson–Mehl–Avrami–Kolmogorov analysis. The back‐diffusion of Ti to the γ matrix is the limiting step for the dissolution of Fe2Ti Laves phase. The kinetic equation of homogenization considering lattice parameters and pre‐exponential factor correction is established. After the double‐stage homogenization at 980 °C/10 h + 1140 °C/4 h, the volume fraction of the Laves phase decreases from 5.11% to 0.26%, and the large eutectic Laves phase is completely dissolved. The reduction in the standard deviation of microhardness at different soaking times effectively reflects the gradual decrease in the degree of microsegregation of alloying elements. The average grain size of the alloy after homogenization is 410 ± 63.1 μm, which is beneficial to control the further refinement of grain during the subsequent hot working.

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Evading the intermediate-temperature embrittlement of L12-strengthened high entropy alloys by alleviating intergranular oxidation

Liu,

Hou,

Zhao

et al. 2024

Corrosion Science

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Effects of minor Nb alloying on the thermal stability and mechanical responses of a γ/γ′ type high-entropy alloy with high Fe content

Cited by 10 publications

References 47 publications

Effects of Nickel on the Microstructure, Mechanical properties and Corrosion Resistance of CoCrFeNixAl0.15Ti0.1 High Entropy Alloy

Effects of Nickel on the Microstructure, Mechanical properties and Corrosion Resistance of CoCrFeNixAl0.15Ti0.1 High Entropy Alloy

Microstructure Evolution and Homogenization Kinetics of 15Cr–30Ni–Fe Heat‐Resistant Alloy

Evading the intermediate-temperature embrittlement of L12-strengthened high entropy alloys by alleviating intergranular oxidation

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