[P2-27] Development of thermodynamic database of Nd-Fe-B-based permanent magnet alloys
Nd-Fe-B permanent magnets with excellent magnetic properties have been used in the industrial applications including medical apparatus and instruments, electrical machinery, aerospace, permanent magnet motor and wind power. In order to fully balance the application of rare-earth resource in magnetic materials and reduce the costs, it is a promise way to introduce high abundant rare earth (RE) metals (e.g. La, Ce, Y) into Nd-Fe-B permanent magnets [1-3]. Phase diagrams and thermodynamic information of the RE-Fe-B alloys are necessary to understand the effect of the abundant rare earth metals on phase formation, microstructure and magnetic properties of Nd-Fe-B permanent magnets.
In this work, the RE-Fe, RE-B and Fe-B sub-binary systems were reviewed firstly in the published literature. After that, the RE-Fe-B (RE=La, Ce, Pr, Nd) ternary systems were assessed using CALPHAD method on the basis of thermodynamic data and phase equilibria data, which is fundamental to obtain the thermodynamic database of multi-component RE-Fe-B alloy systems. The calculated results including liquid projects, isothermal sections and vertical sections as well as the solidification path of some alloys were compared with the experimental results using the thermodynamic database obtained. The thermodynamic database of the Nd-Fe-B-based permanent magnet alloy systems with high abundant rare earth elements is developed finally, which is necessary to design alloy composition and heat treatments of novel Nd-Fe-B permanent magnets with good magnetic properties and low costs.
References
[1] X.J. Cao, L. Chen, S. Guo, J.H. Di, G.F. Ding, R.J. Chen, A.R. Yan, K.Z. Chen, Aip Adv. 8 (2018) 056222.
[2] L. Liu, H. Sepehri-Amin, T. Ohkubo, M. Yano, A. Kato, T. Shoji, K. Hono, J. Alloy. Comp. 666 (2016) 432-439.
[3] J.Y. Jin, T.Y. Ma, M. Yan, Y.J. Zhang, B.X. Peng, Y.S. Liu, F.H. Cao, J. Alloy. Comp. 735 (2018) 2225-2235.
Acknowledgements
This work was supported financially by National Key Research and Development Program of China (2016YFB0700901), National Basic Foundation of China (2014CB643703), National Natural Science Foundation of China (51761008, 51461013), Guangxi Natural Science Foundation (2016GXNSFDA380015, 2016GXNSFGA380001) and Guangxi Project of Science and Technology (2017AD23031).
In this work, the RE-Fe, RE-B and Fe-B sub-binary systems were reviewed firstly in the published literature. After that, the RE-Fe-B (RE=La, Ce, Pr, Nd) ternary systems were assessed using CALPHAD method on the basis of thermodynamic data and phase equilibria data, which is fundamental to obtain the thermodynamic database of multi-component RE-Fe-B alloy systems. The calculated results including liquid projects, isothermal sections and vertical sections as well as the solidification path of some alloys were compared with the experimental results using the thermodynamic database obtained. The thermodynamic database of the Nd-Fe-B-based permanent magnet alloy systems with high abundant rare earth elements is developed finally, which is necessary to design alloy composition and heat treatments of novel Nd-Fe-B permanent magnets with good magnetic properties and low costs.
References
[1] X.J. Cao, L. Chen, S. Guo, J.H. Di, G.F. Ding, R.J. Chen, A.R. Yan, K.Z. Chen, Aip Adv. 8 (2018) 056222.
[2] L. Liu, H. Sepehri-Amin, T. Ohkubo, M. Yano, A. Kato, T. Shoji, K. Hono, J. Alloy. Comp. 666 (2016) 432-439.
[3] J.Y. Jin, T.Y. Ma, M. Yan, Y.J. Zhang, B.X. Peng, Y.S. Liu, F.H. Cao, J. Alloy. Comp. 735 (2018) 2225-2235.
Acknowledgements
This work was supported financially by National Key Research and Development Program of China (2016YFB0700901), National Basic Foundation of China (2014CB643703), National Natural Science Foundation of China (51761008, 51461013), Guangxi Natural Science Foundation (2016GXNSFDA380015, 2016GXNSFGA380001) and Guangxi Project of Science and Technology (2017AD23031).