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Start Over Author "Yaocen Wang" Journal materials research express
2 results on '"Yaocen Wang"'

1. Effect of multi-step annealing with different heating rates on magnetic properties of Fe-Si-B-P-Cu nano-crystalline alloy

Author

Ziyan Hao, Linzhuo Wei, Yuanfei Cai, Yaocen Wang, Mingliang Xiang, Fang Zhao, Yan Zhang, Nikolai S Perov, and Chongde Cao

Subjects
nano-crystalline, thermal stability, soft magnetic, coercivity, multi-step heating, Materials of engineering and construction. Mechanics of materials, TA401-492, Chemical technology, TP1-1185
Abstract

The crystallization behaviors of Fe _83 Si _4 B _8 P _4.3 Cu _0.7 amorphous alloy with different heating rates and magnetic softness of annealed alloys have been widely studied. The rapid heating significantly helped with the decrease of coercivity for annealed samples compared with that for slow heating. It is found that the peak temperature ( T _p1 ) of the first crystallization stage in DSC curves is a critical temperature parameter to distinguish the nucleation and growth processes of α -Fe phase. When the temperature at a constant heating rate is beyond the T _p1 , the nucleation process should be almost finished. The necessary temperature range of high heating rate (400 K min ^−1 ) for the improvement of magnetic softness has been determined from 650 K to 740 K through multi-step annealing with different heating rates. The shortened temperature window of rapid heating and partial rapid heating may simplify and improve the annealing process of high-performance soft magnetic materials in industry. The multi-step annealing with various heating rates also provides a promising strategy for the investigation of crystallization behaviors of amorphous alloys.

Published
2022
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2. First-principle simulation on the crystallization tendency and enhanced magnetization of Fe76B19P5 amorphous alloy

Author

Yunye Liang, Yoshiyuki Kawazoe, Akira Takeuchi, Akihiro Makino, Yan Zhang, and Yaocen Wang

Subjects
Materials science, Amorphous metal, Polymers and Plastics, Magnetic moment, Condensed matter physics, Annealing (metallurgy), Metals and Alloys, Electron, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, law.invention, Amorphous solid, Biomaterials, Magnetization, Crystallography, Electron transfer, law, Crystallization
Abstract

Iron-based amorphous alloys have attracted a growing interest due to their potential in the application of magnetic coil production. However, the magnetization of this kind of material is usually low due to the lack of long range ordering and high alloying element content. In this paper, an Fe76B19P5 amorphous alloy was simulated with ab initio molecular dynamics based on a previous simulation work on an Fe76Si9B10P5 amorphous alloy exhibiting that electron absorbers such as B and P can help enhance the magnetization of nearby Fe atoms. The present simulation results show that replacing Si with B can destabilize the amorphous structure, making it easier to crystallize, but no separate α-Fe participation can be observed in experiments during annealing due to its high B/P content. The results also show an increase in saturation magnetization by 8% can be expected due to the intensified electron transfer from Fe to B/P, and the glass forming ability decreases correspondingly. The idea of enhancing electron transfer can be applied to the development of other Fe-based amorphous alloys for the purpose of larger saturation magnetization.

Published
2015

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