On the enhanced hardening ability and plasticity mechanisms in a novel Mn-added CoCrNi medium entropy alloy during high-pressure torsion

Kishore, Kaushal; Chandan, Avanish Kumar; Hung, Pham Tran; Kumar, Saurabh; Kawasaki, Megumi; Gubicza, Jenő

doi:10.1016/j.jallcom.2022.163941

Cited by 18 publications

(9 citation statements)

References 65 publications

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“…The F MPT was reduced significantly compared to room temperature. The F MPT disappeared in coarse grains of SUS 304 TMF; because of the heating, the mobility of slip band movement increased, and the probability of slip band intersection decreased [21][22][23][24][25][26][27]. There is no F MPT in SUS 316 TMF during the uniaxial tensile test, which uses resistance heating (RH).…”

Section: Influence Of the Volume Fraction Of Mpt On Surface Rougheningmentioning

confidence: 99%

“…Dislocation density, F MPT , and F GMO increase proportionally with the strain level [24][25][26][27][28][29]. For fine grains, the FMPT and dislocation density in a grain become much higher than for coarse grains because the slip band intersection probability becomes much higher in fine grains than in coarse grains [24,27].…”

Section: Influence Of the Volume Fraction Of Mpt On Surface Rougheningmentioning

confidence: 99%

“…MPT occurs as a result of the slip band intersection. The slip band intersection is the place of the martensitic embryo and then becomes MPT [23][24][25][26][27][28][29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

“…The deformation of interior crystal grains from the surface to the second layer could affect the surface unevenness in some kinds of metal [6][7][8][9][10][11][12][13][14][15]. The previous studies concluded that the surface roughening should be expressed as a function of plastic strain as ∆Ra = Ce p , where ∆Ra is the increase in surface roughness, C is a constant, and e p is the plastic strain level [25][26][27][28][29][30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

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Constitutive Model of the Surface Roughening Behavior of Austenitic Stainless Steel

2022

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The martensitic phase transformation (MPT) is one of the most important factors that enhances the surface roughening of stainless-steel thin metal foils (TMF), such as SUS 304, compared to others without MPT, even in the same plastic strain. However, the conventional roughening model does not take into account the influence of MPT. In this study, the authors proposed a new constitutive model to express the surface roughening by taking the influence of MPT into account. The volume fractions of MPT for TMF of SUS304 in various grain sizes are accounted for quantitatively after the tensile test at room temperature and an elevated temperature, and the effect of MPT on the surface roughening is evaluated in comparison to using TMF of SUS316, in which MPT does not occur during plastic deformation. Then, a constitutive model of the surface roughening based on the experimental results is successfully built.

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Section: Influence Of the Volume Fraction Of Mpt On Surface Rougheningmentioning

confidence: 99%

Section: Influence Of the Volume Fraction Of Mpt On Surface Rougheningmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Constitutive Model of the Surface Roughening Behavior of Austenitic Stainless Steel

2022

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“…Cui et al [31] showed that the addition of Al 0.77 at.% to the FeCrNiAlx HEA established it as a promising material for application in aerospace fields, due to its high specific strength and accepted ductility at high temperatures. Moreover, Kishore et al [32] investigated the effect of the addition of Mn to an equi-atomic CoCrNi alloy. They concluded that a Mn addition enhanced the hardening ability because of the steep increase in hardness (~650 Hv in Co 33 Ni 33 Cr 19 Mn 15 alloy vs. ~610 Hv in CoCrNi alloy).…”

Section: Introductionmentioning

confidence: 99%

Phase Prediction, Microstructure and Mechanical Properties of Fe–Mn–Ni–Cr–Al–Si High Entropy Alloys

Mahmoud

Shaharoun

Gepreel

et al. 2022

Metals

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The selection of high-entropy alloys (HEAs), which are relatively lightweight and have unique mechanical properties, remains a substantial challenge. In this study, six new HEAs were designed from the relatively low-cost Fe–Mn–Ni–Cr–Al–Si system using Thermo-Calc software, and then manufactured using a casting process. The effects of the atomic ratio of the alloying elements on the microstructures and mechanical properties of these alloys in the as-cast condition were systematically investigated. Brittle body-centered cubic BCC/B2 and silicide phases were found in relatively large amounts in the form of dendritic structure within large equiaxed grains with fine needle-shaped phases in the Fe30Mn15Ni20Cr15Al10Si10 and Fe35Mn15Ni20Cr15Al10Si5 alloys, in addition to the face-centered cubic (FCC) phase. When the contents of Mn and Ni were increased in the Fe35Mn25Ni15Cr15Al5Si5 and Fe35Mn20Ni20Cr15Al5Si5 alloys, the amounts of brittle phases were reduced; however, the ductile FCC phase is not significant. The FCC phase amount, which appeared as a honeycombed structure, was more than enough when the Si content was decreased to 3%. Broad relationships between the chemical composition of the alloys, especially the Si content, and the hardness and compression properties’ measurements were established. As the Si content decreased, both the hardness and compression properties of the resulting alloy also decreased. The experimental observation of the six HEAs matched the equilibrium phases predicted by the Thermo-Calc calculations.

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Combinatorial Design of Novel Multiprincipal Element Alloys Using Experimental Techniques

Gubicza

2023

Adv Eng Mater

Self Cite

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Multiprincipal element alloys (MPEAs) including high‐entropy alloys are in the focus of materials science since many MPEA compositions exhibit outstanding mechanical and physical properties. These alloys contain 3–6 constituents with similar fractions; therefore, MPEAs correspond to the unexplored middle part of the phase diagrams. The phase composition and the performance of MPEAs are strongly influenced by their chemistry. Thus, it is very important to reveal the correlation between the composition, the structure, and the properties of MPEAs. On the other hand, this task is challenging due to the vast composition space of these alloys. The processing and characterization of combinatorial specimens can yield a fast mapping of compositional libraries of MPEAs. Herein, the experimental techniques developed for manufacturing and investigation of these alloys are overviewed and the results are critically discussed. Finally, further development directions in the field of combinatorial MPEAs are recommended in order to improve the study of the different alloy compositions.

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On the enhanced hardening ability and plasticity mechanisms in a novel Mn-added CoCrNi medium entropy alloy during high-pressure torsion

Cited by 18 publications

References 65 publications

Constitutive Model of the Surface Roughening Behavior of Austenitic Stainless Steel

Constitutive Model of the Surface Roughening Behavior of Austenitic Stainless Steel

Phase Prediction, Microstructure and Mechanical Properties of Fe–Mn–Ni–Cr–Al–Si High Entropy Alloys

Combinatorial Design of Novel Multiprincipal Element Alloys Using Experimental Techniques

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