J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (10): 1791-1798.DOI: 10.1016/j.jmst.2018.02.003
Special Issue: High Entropy Alloys 2018-2020
• Orginal Article • Previous Articles Next Articles
Rui Wanga, Weimin Chenb, Jing Zhonga, Lijun Zhanga()
Received:
2017-09-27
Revised:
2017-12-12
Accepted:
2018-01-24
Online:
2018-10-05
Published:
2018-11-01
Rui Wang, Weimin Chen, Jing Zhong, Lijun Zhang. Experimental and numerical studies on the sluggish diffusion in face centered cubic Co-Cr-Cu-Fe-Ni high-entropy alloys[J]. J. Mater. Sci. Technol., 2018, 34(10): 1791-1798.
Phase | System | Methoda | Type of Diffusivity | Codeb | Refs. |
---|---|---|---|---|---|
fcc | CoCrFeMnNi | QBDC & S-F | Tracer diffusivity | √ | [ |
CoCrFeNi | TMM | Interdiffusivity | √ | [ | |
CoCrFeMnNi | Semi-empirical rules & Re-analyses of Ref. [ | Tracer diffusivity | √ | [ | |
AlCoCrFeNi | DMA & LM | Tracer diffusivity | √ | [ | |
CoCrFeMnNi | DMA, LM & Re-analyses of Ref. [ | √ | |||
CoCrFeNi & CoCrFeMnNi | Radiotracer technique & Gaussian solution | Tracer diffusivity | × | [ | |
CoCrFeMnNi | DM & NIM | Interdiffusivity | √ | [ | |
Tracer diffusivity | × | ||||
CoCrFeMnNi | CALPHAD assessment | Tracer diffusivity | × | [ | |
CoCrCuFeNi | DM & NIM | Interdiffusivity | √ | This work | |
Tracer diffusivity | × |
Table 1 Summary of literature reports on diffusion in different HEAs.
Phase | System | Methoda | Type of Diffusivity | Codeb | Refs. |
---|---|---|---|---|---|
fcc | CoCrFeMnNi | QBDC & S-F | Tracer diffusivity | √ | [ |
CoCrFeNi | TMM | Interdiffusivity | √ | [ | |
CoCrFeMnNi | Semi-empirical rules & Re-analyses of Ref. [ | Tracer diffusivity | √ | [ | |
AlCoCrFeNi | DMA & LM | Tracer diffusivity | √ | [ | |
CoCrFeMnNi | DMA, LM & Re-analyses of Ref. [ | √ | |||
CoCrFeNi & CoCrFeMnNi | Radiotracer technique & Gaussian solution | Tracer diffusivity | × | [ | |
CoCrFeMnNi | DM & NIM | Interdiffusivity | √ | [ | |
Tracer diffusivity | × | ||||
CoCrFeMnNi | CALPHAD assessment | Tracer diffusivity | × | [ | |
CoCrCuFeNi | DM & NIM | Interdiffusivity | √ | This work | |
Tracer diffusivity | × |
Alloy | Nominal compositions (in at.%) | Actual compositions (in at.%) |
---|---|---|
1# | Co22.5Cr22.5Cu5.5Fe22.5Ni27.0 | Co22.5Cr22.8Cu5.4Fe22.7Ni26.6 |
2# | Co25.0Cr25.0Fe25.0Ni25.0 | Co24.9Cr25.3Fe25.2Ni24.6 |
3# | Co26.4Cr22Cu3.2Fe22Ni26.4 | Co26.4Cr22.3Cu3.0Fe22.4Ni25.9 |
Table 2 Nominal and actual compositions of the presently prepared alloys.
Alloy | Nominal compositions (in at.%) | Actual compositions (in at.%) |
---|---|---|
1# | Co22.5Cr22.5Cu5.5Fe22.5Ni27.0 | Co22.5Cr22.8Cu5.4Fe22.7Ni26.6 |
2# | Co25.0Cr25.0Fe25.0Ni25.0 | Co24.9Cr25.3Fe25.2Ni24.6 |
3# | Co26.4Cr22Cu3.2Fe22Ni26.4 | Co26.4Cr22.3Cu3.0Fe22.4Ni25.9 |
Fig. 2. SEM micrographs of the alloys Co22.5Cr22.8Cu5.3Fe22.7Ni26.6 (1#), Co24.9Cr25.3Fe25.2Ni24.6 (2#), and Co26.4Cr22.3Cu3.0Fe22.4Ni25.9 (3#) homogenized at 1373 K for 168 h.
Fig. 4. Comparisons of the model-predicted concentration/interdiffusion profiles with the corresponding experimental data (symbols), and the evaluated diagonal interdiffusivities along the diffusion paths of the diffusion multiples annealed at 1273 K for 72 h.
Fig. 5. Comparisons of the model-predicted concentration/interdiffusion profiles with the corresponding experimental data (symbols), and the evaluated diagonal interdiffusivities along the diffusion paths of the diffusion multiples annealed at 1323 K for 72 h.
Fig. 6. Comparisons of the model-predicted concentration/interdiffusion profiles with the corresponding experimental data (symbols), and the evaluated diagonal interdiffusivities along the diffusion paths of the diffusion multiples annealed at 1373 K for 72 h.
Fig. 7. Comparisons of diagonal interdiffusivities determined in the present work with the reported experimental diffusion data at 1273 K, 1323 K or 1373 K in various subsystems of fcc CoCrCuFeNi system with Ni as the solvent: Co40Ni60 [40], Co4.9Ni95.1 [41], Cr5.1Ni94.9 [41], Fe40Ni60 [40], Co6Cu17Ni77 [27], Cr4Cu8Ni88 [30], Cu6Fe53Ni41 [26], Co25Cr25Fe25Ni25 [8], Co23.95Cr23.3Fe23Mn6.66Ni23.09 [12].
Fig. 8. Comparisons of Arrhenius plots of the tracer diffusivities determined in the present work with the reported temperature-dependent data on diffusion in various fcc systems: pure Co [42], pure Cu [43], pure Fe [44], pure Ni [45], Co in Ni [46], Cr in Ni [47], Fe in Ni [48], Cu60.97Ni29.49Zn9.54 [43], Fe-15Cr-20Ni [49], Co25Cr25Fe25Ni25 [11], Co20Cr20Fe20Mn20Ni20 [11], Co22.22Cr22.22Fe22.22Mn11.12Ni22.22 [10], Al20Co20Cr20Fe20Ni20 [10], Co23.95Cr23.3Fe23Mn6.66Ni23.09 [12].
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