Effect of solid-solution strengthening on deformation mechanisms and strain hardening in medium-entropy V1-Cr CoNi alloys

Chung, Hyun Jung; Kim, Dae Woong; Cho, Woo Jin; Han, Heung Nam; Ikeda, Yûji; Ishibashi, Shoji; Körmann, Fritz; Sohn, Seok Su

doi:10.1016/j.jmst.2021.07.042

Cited by 47 publications

(7 citation statements)

References 68 publications

(64 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In previous studies [8,13,18], ab initio computed root-mean-square (RMS) atomic displacements showed strong correlations with solid-solution strengthening and can, hence, be expected to be a good descriptor of the solid-solution strengthening of alloys. Therefore, we computed the RMS atomic displacements from the ideal FCC lattice sites to the relaxed atomic positions of the alloy models investigated in this study.…”

Section: Ab Initio Calculationmentioning

confidence: 99%

“…Therefore, we computed the RMS atomic displacements from the ideal FCC lattice sites to the relaxed atomic positions of the alloy models investigated in this study. In addition, charge transfer among atoms can also correlate well with local lattice distortions [13,20]. Thus, we computed the Bader atomic charges based on the Yu-Trinkle algorithm [50] as implemented by Henkelman et al [51][52][53].…”

Section: Ab Initio Calculationmentioning

confidence: 99%

“…Against this notion, however, FCC structured CCAs (FCC CCAs) exhibit considerably high yield strength stemming from only two strengthening contributions, that is, solid-solution strengthening and grain-boundary strengthening. In addition, various deformation mechanisms observed in FCC CCAs, e.g., nano-twinning [9,10], transformation-induced plasticity [11,12], and slip band refinement [13], contribute to a high strain-hardening capacity and consequently an improved uniform ductility.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Compositive role of refractory element Mo in improving strength and ductility of face-centered-cubic complex concentrated alloys

et al. 2023

Self Cite

View full text Add to dashboard Cite

Section: Ab Initio Calculationmentioning

confidence: 99%

Section: Ab Initio Calculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Compositive role of refractory element Mo in improving strength and ductility of face-centered-cubic complex concentrated alloys

et al. 2023

Self Cite

View full text Add to dashboard Cite

“…Firstly, the friction stress (lattice friction) or solid solution strengthening depends on the local atomic structure of the material, it occurs as a result of the uctuations in the solute-dislocation interaction energy [14]. It can be calculated according to Hall-Petch relationship based on the yield strength of the austenitic structures with respect to the corresponding grain size [15,16].…”

Section: Introductionmentioning

confidence: 99%

Strengthening Contributions of Mechanical Twinning and Dislocations to the Flow Stress of Hadfield High-Manganese Steel: Quantitative Analysis

Khedr

Min

et al. 2022

J. of Materi Eng and Perform

View full text Add to dashboard Cite

The ow stress of high C-Mn austenitic steel is attributed to lattice friction, dynamic strain aging (DSA), mechanical twinning and forest hardening. However, it has not been clari ed yet which mechanism quantitatively contributes most to the work hardening of 12.5Mn-1.1C steel. In this study, austenitic Had eld steel (1.1 wt.% C and 12.5 wt.% Mn) was tensile tested at a strain rate of 10 s − 1 . The lattice friction was estimated by the Hall-Petch relationship. DSA effect was neglected because of the high strain rate of deformation. Twin plates characteristics and dislocation densities were estimated quantitatively at different strain levels (11, 18, 25, 38, and 55%). The deformed twin plates were studied by optical and transmission electron microscopies. Dislocation densities were estimated by analyzing the X-ray diffraction patterns using Rietveld analyses. A linear approach was utilized to model the ow stress during the plastic deformation, and it is found that the linear model is consistent with the experimental results. During the early stages of the plastic deformation, the mechanical twinning was the dominant deformation mechanism, and it was more effective to the ow stress than the forest hardening due to the enhancement of the twin nucleation process. However, with increasing the strain level, the thicknesses of the twinned plates were increased rather than the initiation of new twin plates, resulting in a reduced contribution by the mechanical twinning to the ow stress. On the other hand, increasing the dislocation densities with an increase in the strain level was detected, which resulted in an enhanced contribution by forest hardening to the ow stress more than the mechanical twinning.

show abstract

“…Multi-principal-element alloys (MPEAs), the so-called medium-or high-entropy alloys (MEAs or HEAs, respectively), have received considerable interest. At the core of the interest lies their potential for achieving the requirements, for example, near-infinite alloy compositions at elevated temperatures [4][5][6][7][8][9][10][11][12][13] . Unlike traditional metallic alloys, MPEAs are concentrated solid solutions comprising mixtures of elements in which the atoms of principal elements tend to be distributed randomly.…”

mentioning

confidence: 99%

Mechanically derived short-range order and its impact on the multi-principal-element alloys

Seol

Sohn

et al. 2022

Nat Commun

Self Cite

View full text Add to dashboard Cite

Chemical short-range order in disordered solid solutions often emerges with specific heat treatments. Unlike thermally activated ordering, mechanically derived short-range order (MSRO) in a multi-principal-element Fe40Mn40Cr10Co10 (at%) alloy originates from tensile deformation at 77 K, and its degree/extent can be tailored by adjusting the loading rates under quasistatic conditions. The mechanical response and multi-length-scale characterisation pointed to the minor contribution of MSRO formation to yield strength, mechanical twinning, and deformation-induced displacive transformation. Scanning and high-resolution transmission electron microscopy and the anlaysis of electron diffraction patterns revealed the microstructural features responsible for MSRO and the dependence of the ordering degree/extent on the applied strain rates. Here, we show that underpinned by molecular dynamics, MSRO in the alloys with low stacking-fault energies forms when loaded at 77 K, and these systems that offer different perspectives on the process of strain-induced ordering transition are driven by crystalline lattice defects (dislocations and stacking faults).

show abstract

Effect of solid-solution strengthening on deformation mechanisms and strain hardening in medium-entropy V1-Cr CoNi alloys

Cited by 47 publications

References 68 publications

Compositive role of refractory element Mo in improving strength and ductility of face-centered-cubic complex concentrated alloys

Compositive role of refractory element Mo in improving strength and ductility of face-centered-cubic complex concentrated alloys

Strengthening Contributions of Mechanical Twinning and Dislocations to the Flow Stress of Hadfield High-Manganese Steel: Quantitative Analysis

Mechanically derived short-range order and its impact on the multi-principal-element alloys

Contact Info

Product

Resources

About