Praveen, S. ; Murty, B. S. ; Kottada, Ravi S. (2012) Alloying behavior in multi-component AlCoCrCuFe and NiCoCrCuFe high entropy alloys Materials Science and Engineering A, 534 . pp. 83-89. ISSN 0921-5093
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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Related URL: http://dx.doi.org/10.1016/j.msea.2011.11.044
Abstract
Multi-component High Entropy Alloys (HEAs) are observed to form simple solid solutions in contrary to general perception that complex compounds may form in such multi-component equi-atomic alloys. In the present study, alloying behavior was investigated using XRD in AlCoCrCuFe and NiCoCrCuFe equi-atomic high entropy alloys synthesized by Mechanical Alloying (MA) and Spark Plasma Sintering (SPS). Simple FCC and BCC phases evolved after MA, while Cu-rich FCC and sigma (σ) phases evolved along with FCC and BCC phases after SPS. Further, NiCoCuFe, NiCoCrFe and NiCoFe equi-atomic alloys were investigated to confirm the formation of Cu-rich FCC, and σ phases. The hardness was observed to be 770 ± 10 HV for AlCoCrCuFe and 400 ± 10 HV for NiCoCrCuFe. Phase evolution after MA and SPS indicate that configurational entropy is not sufficient enough to suppress the formation of Cu-rich FCC and σ phases and enthalpy of mixing appears to play an important role in determining the phase formation in high entropy alloys after sintering.
Item Type: | Article |
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Source: | Copyright of this article belongs to Elsevier Science. |
Keywords: | High Entropy Alloys; Nanostructured Materials; Mechanical Alloying; Ordering; Hardness Measurement; X-ray Diffraction |
ID Code: | 110882 |
Deposited On: | 06 Dec 2017 11:00 |
Last Modified: | 06 Dec 2017 11:00 |
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