Unraveling the origin of local chemical ordering in Fe-based solid-solutions

被引:9
|
作者
Yan, Keyu [1 ]
Xu, Yichen [1 ]
Niu, Jiejue [1 ]
Wu, Yuye [1 ]
Li, Yue [2 ]
Gault, Baptiste [2 ,3 ]
Zhao, Shiteng [1 ]
Wang, Xiaoxiao [1 ]
Li, Yunquan [1 ]
Wang, Jingmin [1 ]
Skokov, Konstantin P. [4 ]
Gutfleisch, Oliver [4 ]
Wu, Haichen [5 ]
Jiang, Daqiang [6 ]
He, Yangkun [1 ]
Jiang, Chengbao [1 ]
机构
[1] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China
[2] Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany
[3] Imperial Coll London, Royal Sch Mines, Dept Mat, Prince Consort Rd, London SW7 2BP, England
[4] Tech Univ Darmstadt, Inst Mat Sci, D-64287 Darmstadt, Germany
[5] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Analyt Ctr, Ningbo 315201, Peoples R China
[6] China Univ Petr, Dept New Energy & Mat, Beijing 102249, Peoples R China
基金
中国国家自然科学基金;
关键词
Fe -Ga magnetostrictive materials; Local chemical ordering; Solid-state phase transformation; Full-lifecycle investigation; SHORT-RANGE ORDER; GA ALLOYS; MECHANICAL-PROPERTIES; MAGNETOSTRICTION; PHONONS;
D O I
10.1016/j.actamat.2023.119583
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Local chemical ordering (LCO) can exert pronounced effects on both structural and functional properties, tailoring LCO domains at (sub-)nanoscale could offer an alternative material-design concept for yet unexplored performance. However, the origin of LCO remains an open question, making accurate manipulation of LCO extremely challenging. Here we selected the Fe-Ga magnetostrictive materials and demonstrated that LCO tetragonal structures play a significant role in optimizing the magnetostrictive properties. The "full-lifecycle", including formation, evolution and dissolution of LCO, is concretely studied from the atomic-scale up by combined experimental and theoretical studies. The dynamic precipitation and dissolution processes of LCO L60 domains during isothermal aging are directly observed based on in-situ high-resolution transmission electron microscopy images, and the corresponding mechanisms are revealed by first-principles calculation. Based on the results, we evidence that LCO domain is a frozen-intermediate-state of a kinetically-slow solid-state phase transformation leading to the formation of the long-range-ordered equilibrium phase with a face-center-cubic structure. We confirm the reversibility of LCO during cycling treatments. Our findings shed light on the origin of LCO in a range of material systems, and we discuss directions for developing materials with superior performance by manipulating LCO domains.
引用
收藏
页数:14
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