Microstructure and strengthening mechanisms in an FCC structured single-phase nanocrystalline Co25Ni25Fe25Al7.5Cu17.5 high-entropy alloy

Fu, Zhiqiang; Chen, Weiping; Wen, Haiming; Zhang, Dalong; Chen, Zhe; Zheng, Baolong; Zhou, Yizhang; Lavernia, Enrique J.

doi:10.1016/j.actamat.2016.01.050

Cited by 392 publications

(105 citation statements)

References 67 publications

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“…Thus, the Hall-Petch hardening contribution becomes much more important than the substructure hardening in samples rotated for angles larger than 180 • . This result is in good agreement with data reported earlier for the nanocrystalline HEA [37].…”

Section: Discussionsupporting

confidence: 83%

“…After the rotation for 180 • at cryogenic temperature, the contribution of the substructure hardening is comparable to that of the Hall-Petch hardening (Figure 7). agreement with data reported earlier for the nanocrystalline HEA [37], It is worth noting that, according to the calculations, the effective grain size in the CoCrFeNiMn alloy after HPT at 293 and 77 K is approximately equal ( Table 2). Higher strength of the sample deformed in cryogenic condition can be ascribed to the contribution of substructure (dislocation) hardening.…”

Section: Discussionsupporting

confidence: 80%

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Evolution of Microstructure and Mechanical Properties of a CoCrFeMnNi High-Entropy Alloy during High-Pressure Torsion at Room and Cryogenic Temperatures

Zherebtsov

Stepanov

Ivanisenko

et al. 2018

Metals

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High-pressure torsion (HPT) is applied to a face-centered cubic CoCrFeMnNi high-entropy alloy at 293 and 77 K. Processing by HPT at 293 K produced a nanostructure consisted of (sub)grains of~50 nm after a rotation for 180 • . The microstructure evolution is associated with intensive deformation-induced twinning, and substructure development resulted in a gradual microstructure refinement. Deformation at 77 K produces non-uniform structure composed of twinned and fragmented areas with higher dislocation density then after deformation at room temperature. The yield strength of the alloy increases with the angle of rotation at HPT at room temperature at the cost of reduced ductility. Cryogenic deformation results in higher strength in comparison with the room temperature HPT. The contribution of Hall-Petch hardening and substructure hardening in the strength of the alloy in different conditions is discussed.

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Section: Discussionsupporting

confidence: 83%

Section: Discussionsupporting

confidence: 80%

Evolution of Microstructure and Mechanical Properties of a CoCrFeMnNi High-Entropy Alloy during High-Pressure Torsion at Room and Cryogenic Temperatures

Zherebtsov

Stepanov

Ivanisenko

et al. 2018

Metals

View full text Add to dashboard Cite

show abstract

“…However, long time mechanical alloying process (usually more than 60 h) is necessary to achieve the HEAs powder [5,6]. Furthermore, the powder is often contaminated by the milling media and the environment during mechanical alloying [4][5][6]. Therefore, it is a challenge to find a method that is convenient, high-efficient and low-cost to prepare HEAs.…”

Section: Introductionmentioning

confidence: 98%

“…Using spark plasma sintering (SPS) to consolidate mechanically alloyed HEAs powder is a promising method to obtain high-performance bulk HEAs [5,6]. However, long time mechanical alloying process (usually more than 60 h) is necessary to achieve the HEAs powder [5,6]. Furthermore, the powder is often contaminated by the milling media and the environment during mechanical alloying [4][5][6].…”

Section: Introductionmentioning

confidence: 99%