Cryogenic Treatment of CoCrFeMnNi(NbC) High-Entropy Alloys
Journal of Materials Engineering and Performance, ISSN: 1544-1024, Vol: 28, Issue: 11, Page: 6779-6788
2019
- 7Citations
- 19Captures
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Article Description
The effect of cryogenic treatment on the microstructure and mechanical properties of CoCrFeMnNi and CoCrFeMnNi(NbC) high-entropy alloys was investigated during annealing. The heat-treated samples were characterized by optical microscopy, scanning electron microscopy–wavelength-dispersive x-ray spectroscopy, x-ray diffraction technique, differential scanning calorimetry, Vickers hardness testing and tensile testing. The results showed a single-phase FCC crystal structure matrix in both alloys during cryogenic treatment and annealing. Cryogenic treatment altered the recrystallization behavior of CoCrFeMnNi high-entropy alloy, while it did not influence the recrystallization of CoCrFeMnNi(NbC) high-entropy alloy. It was also found that cryogenic treatment changed the precipitation behavior of CoCrFeMnNi(NbC) high-entropy alloy during annealing. In both studied high-entropy alloys, the mechanical testing indicated that the cryogenic treatment can effectively reduce the yield strength of cold-rolled samples after annealing. This was primarily attributed to the effect of cryogenic treatment in enhancing crystalline defects annihilation. Furthermore, the cryogenic treatment increased the ultimate tensile strength of CoCrFeMnNi(NbC). A lager plastic deformation and precipitates were considered as the main reasons for the higher ultimate tensile strength.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85074848604&origin=inward; http://dx.doi.org/10.1007/s11665-019-04439-8; http://link.springer.com/10.1007/s11665-019-04439-8; http://link.springer.com/content/pdf/10.1007/s11665-019-04439-8.pdf; http://link.springer.com/article/10.1007/s11665-019-04439-8/fulltext.html; https://dx.doi.org/10.1007/s11665-019-04439-8; https://link.springer.com/article/10.1007/s11665-019-04439-8
Springer Science and Business Media LLC
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