Inclusion engineering in Co-based duplex entropic alloys
- Title
- Inclusion engineering in Co-based duplex entropic alloys
- Author
- 박주현
- Keywords
- Duplex entropic alloys; Co-based alloys; Non-metallic inclusion; High temperature phase equilibria; Agglomeration
- Issue Date
- 2021-11
- Publisher
- ELSEVIER SCI LTD
- Citation
- MATERIALS & DESIGN, v. 210, NO 110097, Page. 1-12
- Abstract
- Co-based duplex entropic alloy is designed very recently to replace pure Co as a major component of the binder phase for cemented carbide cutting tools. This work aims to provide a fundamental study of oxide inclusion characteristics in the duplex fcc + hcp Co-based entropic alloys. It is found that the Co85-xCrxFe7.5Ni7.5 (x = 15, 30 at.%) alloys hold the highest liquidus (T-liq) and solidus (T-sol) temperatures, compare with the Co85-xCrxMn7.5Ni7.5 (x = 15, 30 at.%) and Co77.5-xCrxFe7.5Mn7.5Ni7.5 (x = 15, 30 at.%) alloys. For each grade, the increasing Cr content leads to a decrease of T-sol and T-liq temperatures. It is also noted that there is an approximate 100 degrees C of undercooling exists in each grade during the solidification. The stable oxide inclusion in the Co85-xCrxMn7.5Ni7.5 and Co77.5-xCrxFe7.5Mn7.5Ni7.5 alloys is the MnCr2O4 type, while Cr2O3 is the main stable inclusion in the Co85-xCrxFe7.5Ni7.5 alloy. Furthermore, the size range of the MnCr2O4 particles is larger than that of Cr2O3. The theoretical calculation shows that MnCr2O4 has a higher coagulation coefficient than Cr2O3 does. This is due to the influence of the thermo-physical parameters, i.e. the interfacial energy between the oxide and the alloy and the viscosity of liquid alloy. The theoretical calculation fits well with the experimental findings.
- URI
- https://www.sciencedirect.com/science/article/pii/S0264127521006523https://repository.hanyang.ac.kr/handle/20.500.11754/169872
- ISSN
- 0264-1275
- DOI
- 10.1016/j.matdes.2021.110097
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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