The correlation of microstructural development and thermal stability of mechanically alloyed multicomponent Fe-Co-Ni-Zr-B alloys |
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| Affiliation: | 1. School of Materials Science and Engineering, Shanghai Jiao Tong University, No. 800, Dong Chuan Road, Minhang District, Shanghai 200240, China;2. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, No. 800, Dong Chuan Road, Minhang District, Shanghai 200240, China;3. State Key Laboratory of Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 10083, China;4. Institute of Materials Science of Madrid, CSIC, 28049 Madrid, Spain;1. School of Materials Science & Engineering, Hefei University of Technology, Hefei 230009, China;2. School of Mechanical and Material Engineering, Jiujiang University, Jiujiang 332005, China;1. Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China;2. Laiwu Xinyi Powder Metallurgy Products Co. Ltd., Laiwu 271103, China |
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| Abstract: | The microstructural evolution of multicomponent Fe70-x-yCoxNiyZr10B20 (x = 0, 7, 21; y = 7, 14, 21, 28) alloys during mechanical alloying (MA) has been studied using XRD, SEM and TEM. Mixtures of elemental and pre-alloyed powders have been transformed initially into the single supersaturated bcc α-Fe solid solution phase for the alloys investigated. Subsequently, an amorphous phase has been obtained in Co-free alloys and Co-containing alloys with high Ni/Co ratios of 1 and 3. However, no amorphous phase was detected in another Co-containing alloy with a lower Ni/Co ratio (e.g. 0.33). The thermal stability of the as-milled powders has been investigated by a combination of DSC and the Pendulum magnetometer experiments. The DSC studies provide information on the thermodynamics and kinetics of crystallization of amorphous structure as a function of alloying contents. The Pendulum magnetometer studies reveal the phase transformation from nanocrystalline bcc α-Fe solid solution to amorphous structure during MA and the thermomagnetization behavior of the as-milled powder. |
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