Presentation Information
[O10-1]Phase transition in Sm-Co and its interesting phenomena
*Hubin Luo1, Zhen Zhao1, Niuniu Wang1, Yun Li1, Lei Liu1, Yong Ding1, Renjie Chen1, Jian Zhang1, Izabela Szlufarska2, J. Ping Liu3, Baogen Shen4, Aru Yan1 (1. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences (China), 2. University of Wisconsin-Madison (United States of America), 3. University of Texas at Arlington (United States of America), 4. Insititute of Physics, Chinese Academy of Sciences (China))
Keywords:
Sm-Co,Phase transition,Amorphization,Crystallization
Most of the investigations about Sm-Co have been dedicated to the formation of cellular microstructure due to the phase separation of SmCo5 and Sm2Co17, which is important for its coercivity. Here, I would like to introduce the phase transition between crystalline and amorphous of Sm-Co and show that the phase transition, by its nature, has profound indications on various materials properties such as mechanical and metallurgical behaviors. We found that the stress-induced amorphization of Sm-Co compounds can accommodate large strain by shear banding, without significant local dilation/contraction that usually serves crack opening within the bands [1-4]. For the crystallization from amorphous state, we reported semicrystalline nucleation when Sm atoms form a lattice but Co atoms are still amorphous between the planes, which renders an ultralow interfacial energy during nucleation [5]. The physics behind these phenomena may be used for future design of materials with good performance.
[1] Luo H, Sheng H, Zhang H, Wang F, Fan J, Du J, et al. Nat. Commun. 2019;10:3587.[2] Luo H, Zhang H, Sheng H, Liu JP, Szlufarska I. Mater. Sci. Eng., A 2020;785:139340.[3] Zhao Z, Zhao H, Luo H, Liu L, Ding Y, Zhang X, et al. Mater. Today Commun. 2022;31:103676.[4] Wang N, Luo H, Liu L, Ding Y, Chen R, Zhang X, et al. Mater. Today Commun. 2023;35:106002.[5] Li Y, Luo H, Wang F, Yang Y, Song C, Ping Liu J, et al. Mater. Today 2024;77:1.
[1] Luo H, Sheng H, Zhang H, Wang F, Fan J, Du J, et al. Nat. Commun. 2019;10:3587.[2] Luo H, Zhang H, Sheng H, Liu JP, Szlufarska I. Mater. Sci. Eng., A 2020;785:139340.[3] Zhao Z, Zhao H, Luo H, Liu L, Ding Y, Zhang X, et al. Mater. Today Commun. 2022;31:103676.[4] Wang N, Luo H, Liu L, Ding Y, Chen R, Zhang X, et al. Mater. Today Commun. 2023;35:106002.[5] Li Y, Luo H, Wang F, Yang Y, Song C, Ping Liu J, et al. Mater. Today 2024;77:1.