Tensile properties of the Cr–Fe–Ni–Mn non-equiatomic multicomponent alloys with different Cr contents

Stepanov, Nikita; Shaysultanov, D.G.; Tikhonovsky, М.А.; Салищев, Г. А.

doi:10.1016/j.matdes.2015.08.007

Cited by 96 publications

(33 citation statements)

References 38 publications

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“…As Zr has the largest atomic radii (r Zr = 160 p.m.) among the constituents of the AlNbTiVZr x alloys, it may cause the strongest SSS due to the lattice distortions. Several attempts were made to evaluate the SSS in HEAs [51,52]. These calculations gave reasonable agreement with the strength of disordered HEAs; however theoretical predictions are obviously inappropriate for ordered alloys like the AlNbTiVZr x .…”

Section: Effect Of Zr On Mechanical Properties Of the Alnbtivzr X Alloysmentioning

confidence: 99%

Structure and mechanical properties of B2 ordered refractory AlNbTiVZrx (x = 0–1.5) high-entropy alloys

Yurchenko

Stepanov

Zherebtsov

et al. 2017

Materials Science and Engineering: A

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Structure and mechanical properties of the AlNbTiVZr x (x = 0; 0.1; 0.25; 0.5; 1; 1.5) refractory high-entropy alloys were investigated after arc melting and annealing at 1200°C for 24 h. The AlNbTiV alloy had a B2 ordered single phase structure. Alloying with Zr resulted in (i) change of the degree of order of the B2 phase; and (ii) precipitation of the Zr 5 Al 3 and C14 Laves ZrAlV phases. The density of the AlNbTiVZr x alloys varied from 5590 kg m −3 for the AlNbTiV alloy to 5870 kg m −3 for the AlNbTiVZr 1.5 alloy. The compression yield strength at 22°C increased with an increase in the Zr content from 1000 MPa for the AlNbTiV alloy to 1535 MPa for the AlNbTiVZr 1.5 alloy. The plasticity raised from 6% for the AlNbTiV alloy to > 50% for the AlNbTiVZr 0.5 alloy and then dropped to 0.4% for the AlNbTiVZr 1.5 alloy. At 600°C, the strongest alloy was also the AlNbTiVZr 1.5 , whereas, at 800°C, the AlNbTiVZr 0.1 alloy demonstrated the maximum strength. The plasticity of the AlNbTiV alloy at 600°C increased up to 14.3%, while the Zr-containing alloys had lower plasticity. At 800°C, all the AlNbTiVZr x alloys could be plastically deformed up to 50% of strain without fracture. Ordering in the alloys and the reasons of a complicated dependence of mechanical properties of the AlNbTiVZr x alloys on the Zr content and temperature were discussed.

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Section: Effect Of Zr On Mechanical Properties Of the Alnbtivzr X Alloysmentioning

confidence: 99%

Structure and mechanical properties of B2 ordered refractory AlNbTiVZrx (x = 0–1.5) high-entropy alloys

Yurchenko

Stepanov

Zherebtsov

et al. 2017

Materials Science and Engineering: A

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222

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“…Probably, complex stress fields around each atom in the fcc lattice of the CoCrFeNiMn-based alloys due to the differences in atomic sizes and shear modulus of the composing elements may increase the strengthening effect of carbon in comparison with more dilute steels. The developed theoretical approaches for solid solution strengthening in HEAs account only for substitutional solid solutions [38,61,62] and therefore it difficult to make any calculation to prove this assumption. However, the previously reported data on CoCrFeNiMn-0.5 (at.%) C and Fe 40$4 Ni 11$3 Mn 34$8 Al 7$5 Cr 6 -1.1 (at.%) C alloys [45,46] confirm strong solid solution strengthening effect of C. In the CoCrFeNiMn-0.5 (at.%) C alloy, the yield strength increases by z 120 MPa/at% C, while in the Fe 40$4 Ni 11$3 Mn 34$8 Al 7$5 Cr 6 -1.1 (at.%) C the increase of yield strength is 178 MPa/at%C.…”

Section: Microstructure-properties Relationship In the Cocrfenimn-1(amentioning

confidence: 99%

Effect of thermomechanical processing on microstructure and mechanical properties of the carbon-containing CoCrFeNiMn high entropy alloy

Stepanov

Shaysultanov

Chernichenko

et al. 2017

Journal of Alloys and Compounds

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a b s t r a c tMicrostructural evolution during cold sheet rolling to 80% thickness strain and annealing at 600e1100 C for 30 min of the CoCrFeNiMn high entropy alloy doped with 1 at.% of C and resulting mechanical properties of the alloy are reported. It is shown that in the initial homogenized (24 h at 1000 C) condition the alloy has single fcc phase structure. Cold rolling is accompanied by dislocation slip, deformation twinning and formation of shear bands. Annealing at 600 C after 80% cold rolling results only in partial recrystallization of cold-deformed structure, while an increase of the annealing temperature produces fully recrystallized microstructure. Comparison with the data on undoped CoCrFeNiMn alloy demonstrates that the addition of carbon pronouncedly increases dislocation activity simultaneously retarding deformation twinning during rolling and decreases the fraction of twin boundaries in the annealed condition. The effect of carbon can be attributed to an increase of stacking fault energy of the carbon-containing alloy. Cold rolling results in a substantial strengthening of the alloy; its ultimate tensile strength approaches 1500 MPa, but at the expense of low ductility. Good combination of strength and ductility can be obtained after annealing. For example, after annealing at 800 C, the alloy has yield strength of 720 MPa, ultimate tensile strength of 980 MPa, uniform elongation of 21% and elongation to fracture of 37%. It is shown that the high strength of the annealed alloy can be attributed to (i) strong grain boundary strengthening; (ii) solid solution strengthening by carbon.

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“…New interesting compositions were identified and mechanically tested, some of them having mechanical properties equivalent (e.g. Cr18Ni14Fe40Mn28 [7], Cr18FeMnNi [8] or Co5Cr2Fe40Mn27Ni26 [9]) or superior (CoCrNi [10,11]) to the Cantor alloy, or sometimes lower like Co6Cr2Fe26Mn38Ni28 [12]. These studies, while focusing on a few very specific compositions, motivate a more comprehensive exploration of the vast composition space of this multi-component system.…”

Section: Introductionmentioning

confidence: 99%

Combining experiments and modeling to explore the solid solution strengthening of high and medium entropy alloys

et al. 2019

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The mechanical properties due to solid solution strengthening are explored within the single phase fcc domain of the Co-Cr-Fe-Mn-Ni high entropy alloy (HEA) system. This is achieved by combining an efficient and reproducible metallurgical processing of alloys to X-ray diffraction and nanoindentation characterization techniques, thus enabling to get access to 24 different bulk alloys. Large variations of nanohardness are seen with composition. Experimental results are rationalized in terms of lattice misfit and elastic constant variations with alloy-composition, through the use of an analytical mechanistic theory for the temperature-, composition-and strain-rate-dependence of the initial yield strength of fcc HEAs, with predictions made using only experimental inputs. The good agreement obtained by comparing model predictions to experiments provides the basic framework for mechanical properties optimization within the Co-Cr-Fe-Mn-Ni system; the approach could be systematically applied to all classes of fcc HEAs.

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Tensile properties of the Cr–Fe–Ni–Mn non-equiatomic multicomponent alloys with different Cr contents

Cited by 96 publications

References 38 publications

Structure and mechanical properties of B2 ordered refractory AlNbTiVZrx (x = 0–1.5) high-entropy alloys

Structure and mechanical properties of B2 ordered refractory AlNbTiVZrx (x = 0–1.5) high-entropy alloys

Effect of thermomechanical processing on microstructure and mechanical properties of the carbon-containing CoCrFeNiMn high entropy alloy

Combining experiments and modeling to explore the solid solution strengthening of high and medium entropy alloys

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