Aligning nano-scale crystals in bulk materials  

作　　者：Xiangyi Zhang Yingxin Hua Xiaohong Li 

机构地区：[1]Center for Extreme Deformation Research,State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao,066004,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2025年第4期211-218,共8页中国科学:物理学、力学、天文学(英文版)

基　　金：supported by the National Key Research and Development Program of China(Grant No.2021YFB3500302);the National Natural Science Foundation of China(Grant Nos.51931007,U22A20116,and 52071279)。

摘　　要：Crystal orientation determines various material performances including magnetic,electrical,and mechanical properties.However,achieving the alignment of nano-grains along a specific crystallographic orientation in bulk materials remains a formidable challenge.Departing from conventional approaches using polycrystalline materials,we report a strategy to overcome this challenge by deliberately introducing strain-energy anisotropy to select oriented nucleation/growth of crystals in amorphous materials.To demonstrate its efficacy,we employed ferromagnetic materials as a proof of concept.Using our approach,a range of previously inaccessible bulk ferromagnetic nanomaterials with strong c-axis orientation have been created.The resulting bulk oriented nano-grained magnets exhibit a high energy density,168 kJ m^(-3)for Sm Co_(7)and 235.2 kJ m^(-3)for Pr Co_(5)ferromagnets,greatly surpassing that of their state-of-the-art counterparts with 23%-62%enhancement.Our strategy is general and applicable to other material systems,including thermoelectric,piezoelectric,and ferroelectric materials,to achieve the desired oriented nano-grains for technological applications.

关 键 词：ferromagnetic materials permanent magnets magnetic properties oriented nano-grains nanocrystalline materials 

分 类 号：O73[理学—晶体学] O469[一般工业技术—材料科学与工程] TB383.1