TY - JOUR
T1 - Inclusion engineering in Co-based duplex entropic alloys
AU - Wang, Wei
AU - Wang, Yong
AU - Mu, Wangzhong
AU - Park, Joo Hyun
AU - Kong, Hui
AU - Sukenaga, Sohei
AU - Shibata, Hiroyuki
AU - Larsson, Henrik
AU - Mao, Huahai
N1 - Funding Information:
W. Mu would like to acknowledge the Swedish Foundation for International Cooperation in Research and Higher Education (STINT, Project No. PT2017-7330 & IB2020-8781), Swedish iron and steel research office (Jernkontoret) and National Science Foundation of China (NSFC) for financial support of the research and writing the manuscript. W. Wang would like to thank the Key R&D Science and Technology Development Project of Jilin Provincial Science and Technology Department (Grant No. 20200401106GX) for the financial support. Y. Wang would like to acknowledge China Scholarship Council (CSC). H. Kong and W. Mu would like to thank Key Research and Development Plan of Anhui Province (202104b11020007) for the financial support.
Publisher Copyright:
© 2021 The Authors
PY - 2021/11/15
Y1 - 2021/11/15
N2 - 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 (Tliq) and solidus (Tsol) 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 Tsol and Tliq temperatures. It is also noted that there is an approximate 100 °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.
AB - 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 (Tliq) and solidus (Tsol) 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 Tsol and Tliq temperatures. It is also noted that there is an approximate 100 °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.
KW - Agglomeration
KW - Co-based alloys
KW - Duplex entropic alloys
KW - High temperature phase equilibria
KW - Non-metallic inclusion
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U2 - 10.1016/j.matdes.2021.110097
DO - 10.1016/j.matdes.2021.110097
M3 - Article
AN - SCOPUS:85114507856
VL - 210
JO - International Journal of Materials in Engineering Applications
JF - International Journal of Materials in Engineering Applications
SN - 0264-1275
M1 - 110097
ER -