材料科学
纳米晶材料
无定形固体
工程物理
非晶态金属
国家(计算机科学)
冶金
纳米技术
合金
结晶学
计算机科学
化学
算法
工程类
作者
Xunsi Wang,Li Jian Song,Juntao Huo,Meng Gao,Yan Zhang
标识
DOI:10.1002/adma.202311406
摘要
Abstract Amorphous alloys, also known as metallic glasses, exhibit many advanced mechanical, physical, and chemical properties. Owing to the nonequilibrium nature, their energy states can vary over a wide range. However, the energy relaxation kinetics are very complex and composed of various types that are coupled with each other. This makes it challenging to control the energy state precisely and to study the energy‐properties relationship. This brief review introduces the recent progresses on studying the enthalpy relaxation kinetics during isothermal annealing, for example, the observation of two‐step relaxation phenomenon, the detection of relaxation unit (relaxun), the key role of large activation entropy in triggering memory effect, the influence of glass energy state on nanocrystallization. Based on the above knowledge, a new strategy is proposed to design a series of amorphous alloys and their composites consisting of nanocrystals and glass matrix with superior functional properties by precisely controlling the nonequilibrium energy states. As the typical examples, Fe‐based amorphous alloys with both advanced soft magnetism and good plasticity, Gd‐based amorphous/nanocrystalline composites with large magnetocaloric effect, and Fe‐based amorphous alloys with high catalytic performance are specifically described.
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