Crystallographically degenerate B2 precipitation in a plastically deformed <i>fcc</i>-based complex concentrated alloy

Choudhuri, Deep; Shukla, Shivakant; Green, Whitley B.; Gwalani, Bharat; Ageh, V.; Banerjee, Rajarshi

doi:10.1080/21663831.2018.1426649

Cited by 46 publications

(20 citation statements)

References 21 publications

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“…HS materials have very diverse microstructures [1], including heterogeneous lamella structure [2], gradient structure [3][4][5][6][7][8], laminate structure [9,10], dual phase CONTACT Yuntian Zhu ytzhu@ncsu.edu; Xiaolei Wu xlwu@imech.ac.cn structure [11][12][13], harmonic structure [14][15][16], bi-modal structure [17][18][19][20], metal matrix composites [21][22][23][24][25][26], etc. These apparently very diverse structures have a common feature: all of them consist of both soft domains and hard domains with dramatically different flow stresses (or strength) [1].…”

Section: Introductionmentioning

confidence: 99%

Perspective on hetero-deformation induced (HDI) hardening and back stress

Zhu

2019

Materials Research Letters

863

135

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Heterostructured materials have been reported as a new class of materials with superior mechanical properties, which was attributed to the development of back stress. There are numerous reports on back stress theories and measurements with no consensus. Back stress is developed in soft domains to offset the applied stress, making them appear stronger, while forward stress is developed to make hard domains appear weaker. The extra hardening in heterostructured materials is resulted from interactions between back stresses and forward stresses, and should be described as hetero-deformation induced (HDI) hardening and the measured 'back stress' should be renamed HDI stress. IMPACT STATEMENT The 'back stress' hardening in the literature can be described more accurately as hetero-deformation induced (HDI) hardening and the measured 'back stress' should be renamed HDI stress.

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Section: Introductionmentioning

confidence: 99%

Perspective on hetero-deformation induced (HDI) hardening and back stress

Zhu

2019

Materials Research Letters

863

135

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“…This problem is typical of single fcc phase HEAs based on 3d transition metals [3,26]. A proper tailoring of the chemical composition along with microstructure modification using thermal/thermomechanical treatment resulted in alloys, which showed a significant increment in strength without sacrifice in ductility due to the formation of fine fcc grains and/or nanoscale precipitates of second phase(s) [10,14,[27][28][29][30][31][32][33][34]. The most significant strengthening was found to be induced by nanoscale precipitates (e.g.…”

Section: Introductionmentioning

confidence: 99%

Recrystallized microstructures and mechanical properties of a C-containing CoCrFeNiMn-type high-entropy alloy

Klimova

Shaysultanov

Chernichenko

et al. 2019

Materials Science and Engineering: A

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The effect of cold rolling to 80% thickness reduction and annealing at 973-1373 K for 1 h on the microstructure and mechanical properties of a C-containing CoCrFeNiMn high-entropy alloy was studied. Cold rolling significantly strengthened the alloy to the yield strength of 1310 MPa. Annealing at 973 K or 1073 K resulted in incomplete recrystallization of an fcc matrix and M 23 C 6-type carbide precipitations aligned with highly elongated grains/subgrains. Complete recrystallization occurred during annealing at 1173 − 1373 K. The ordered arrangement of the carbides was not observed after annealing at 1273 K or 1373 K. The volume fraction of carbides decreased with increasing the annealing temperature that can be reasonably described by a Thermo-Calc prediction. The coarsening behavior of the microstructure constituents was studied during isothermal annealing at 1173 K for 1-50 h. It was found that the grain growth and the particle coarsening can be expressed by power law functions of annealing time with grain/particle size exponents of about 2 and 3, respectively. An increase in the annealing temperature from 973 K to 1373 K led to a gradual softening of the alloy; the yield strength decreased from 870 MPa to 320 MPa, whereas total elongation increased from 24% to 47%, respectively. Contributions of various strengthening mechanisms into the overall strength of the alloy were discussed.

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“…В работе [34] было показано, что в сплаве CoCrFeMnNi образуются σ -фаза, упорядоченная B 2 фаза и карбиды состава M 23 C 6 при температурах до 1000 K, 1200 K и 1400 K соответственно. B 2 фаза с ОЦК-решеткой, содержащая никель и алюминий, была обнаружена после пластической деформации [35].…”

Section: Introductionunclassified

Экспериментально-теоретическое исследование эволюции атомной структуры высокоэнтропийных сплавов на основе Fe, Cr, Ni, Mn и Co при термическом и радиационном старении

Мешков¹,

Новоселов²,

Янилкин³

et al. 2020

Физика Твердого Тела

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The comprehensive experimental and theoretical study of the processes of local ordering of multicomponent alloys was carried out. Experimental techniques included atom-probe tomography and measurement of electrical resistivity during isochronal annealing. The theoretical study was carried out by atomistic modeling methods. The evolution of the system was described in the framework of the multiscale paradigm which is based on quantum-mechanical calculations. The initial stage of the decomposition of a solid solution of CoCrFeNi alloy with the formation of Ni4Cr and Ni2Cr precipitations was demonstrated for the first time by the employed approach.

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Crystallographically degenerate B2 precipitation in a plastically deformed fcc-based complex concentrated alloy

Cited by 46 publications

References 21 publications

Perspective on hetero-deformation induced (HDI) hardening and back stress

Perspective on hetero-deformation induced (HDI) hardening and back stress

Recrystallized microstructures and mechanical properties of a C-containing CoCrFeNiMn-type high-entropy alloy

Экспериментально-теоретическое исследование эволюции атомной структуры высокоэнтропийных сплавов на основе Fe, Cr, Ni, Mn и Co при термическом и радиационном старении

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