| Crystallization kinetics and induced magnetic properties of bulk （Fe,Co）-Zr-Nd-B metallic glass |
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| 引用本文： | 李福山,张涛,关绍康,沈宁福. Crystallization kinetics and induced magnetic properties of bulk （Fe,Co）-Zr-Nd-B metallic glass[J]. 中国有色金属学会会刊, 2004, 14(5): 840-845 |
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| 作者姓名： | 李福山 张涛 关绍康 沈宁福 |
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| 作者单位： | [1]ResearchCenterforMaterials,ZhengzhouUniversity,Zhengzhou450002,China [2]SchoolofMaterialsScienceandEngineering,BeijingUniversityofAeronauticsandAstronautics,Beijing100083,China |
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| 基金项目： | 河南省自然科学基金，河南省教育厅自然科学基金 |
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| 摘 要： | Crystallization kinetics and phase transformation of bulk Fe64 Co7 Zr6 Nd3B20 metallic glass were studied by X-ray diffractometry (XRD), differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). Based on the Kissinger analyses, the activation energies for the nucleation and growth during the first, second and third crystallization-stages of the metallic glass are determined to be 294, 475 and 365 kJ/mol, respectively, and the activation energy for the glass transition is determined to be 1 242 kJ/mol. The Johnson-Mehl-Avrami (JMA) analysis under the isothermal condition reveals that the crystallization process is a three-dimensional controlled growth of nuclei at a constant nucleation rate. The crystalline grains are in the size of less than 50 nm after the selected annealing treatments. In the completely crystallized state, the alloy exhibits the maximum coercivity (Hc) of 34.8 kA/m and corresponding energy product of 11 kJ/m^3.
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| 关 键 词： | 结晶化 动力学 铁基金属玻璃 磁性 无定形合金 （Fe Co）-Zr-Nd-B |
Crystallization kinetics and induced magnetic properties of bulk (Fe,Co)-Zr-Nd-B metallic glass |
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| LI Fu-shan,ZHANG Tao,GUAN Shao-kang,SHEN Ning-fu. Crystallization kinetics and induced magnetic properties of bulk (Fe,Co)-Zr-Nd-B metallic glass[J]. Transactions of Nonferrous Metals Society of China, 2004, 14(5): 840-845 |
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| Authors: | LI Fu-shan ZHANG Tao GUAN Shao-kang SHEN Ning-fu |
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| Affiliation: | LI Fu-shan~1,ZHANG Tao~2,GUAN Shao-kang~1,SHEN Ning-fu~1 |
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| Abstract: | Crystallization kinetics and phase transformation of bulk Fe64 Co7 Zr6 Nd3 B20 metallic glass were studied by X-ray diffractometry (XRD), differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). Based on the Kissinger analyses, the activation energies for the nucleation and growth during the first, second and third crystallization-stages of the metallic glass are determined to be 294, 475 and 365 kJ/mol, respectively,and the activation energy for the glass transition is determined to be 1 242 kJ/mol. The Johnson-Mehl-Avrami (JMA) analysis under the isothermal condition reveals that the crystallization process is a three-dimensional controlled growth of nuclei at a constant nucleation rate. The crystalline grains are in the size of less than 50 nm after the selected annealing treatments. In the completely crystallized state, the alloy exhibits the maximum coercivity (Hc) of 34.8 kA/m and corresponding energy product of 11 kJ/m3. |
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| Keywords: | nanocrystallization kinetics bulk Fe-based metallic glass magnetic properties |
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