(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長(zhǎng)沙 410083；
2. 江西理工大學(xué) 材料與化學(xué)工程學(xué)院，贛州341000；3. 同濟(jì)大學(xué) 上海市金屬功能材料重點(diǎn)實(shí)驗(yàn)室，上海200092)
摘 要:
關(guān)鍵字: 非晶合金；納米晶；相變；晶粒尺寸；晶格常數(shù)
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. School of Materials Science and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;
3. Shanghai Key Laboratory of D&A for Metal-Functional Materials, Tongji University, Shanghai 200092, China）
Abstract:The crystallization process of the amorphous soft magnetic alloy Fe75.5Si13.5B9Cu2 was investigated by DSC, XRD and TEM. The DSC curves show two exothermal peaks, of which the crystallization activation energy Ea are 369.177 kJ/mol and 430.162 kJ/mol in average for the first peak and second one, respectively. This can be explained by the crystallization mechanism, that is, grain nucleation and growth process of α-Fe(Si) and the precipitation of Fe3B and Fe2B phases. Annealing at 500 to 680 ℃ for 1 h, the nano-grain size of α-Fe(Si) is minimate at 500 ℃, and the lattice parameter of α-Fe(Si) solid solution increases with rising temperature at the beginning, reaches the maximum value at 560 ℃ and goes down slightly. Moreover, both of the grain size and the lattice parameter increase with the annealing process continuing at 500 ℃ and the average grain size is about 20 nm for 1 h.
Key words: amorphous alloy; nano-grain; phase transformation; gain size; lattice parameter
