1 College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China 2 Taiyuan University of Science and Technology, Taiyuan 030024, Shanxi, China
Effect of surface self-nanocrystallization and Si infiltration on Si diffusion behavior, hardness and magnetic properties of pure Fe
1 College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China 2 Taiyuan University of Science and Technology, Taiyuan 030024, Shanxi, China
摘要 Surface nanocrystallization of pure Fe was performed using an improved surface treatment process. The phase transfor-mation and Si in.ltration depth of the pure Fe before and after surface mechanical attrition treatment (SMAT) were compared by X-ray diffraction, scanning electron microscopy and energy-dispersive X-ray spectroscopy. The results indicated that nanocrystallization of Fe surface was achieved using SMAT, which resulted in deeper penetration of Si. Prolonging time of SMAT and Si in.ltration also resulted in increasing microhardness, with the hardness .rst increasing with increasingdistance from the surface and then decreasing. Furthermore, longer Si in.ltration time, nanocrystallization of Si and longer SMAT time resulted in higher saturation magnetization (MS). The greatest Si penetration depth (150 lm), maximum hardness (280 HV), and maximum MS (1.849 9 106 A/m) were achieved after SMAT for 45 min and Si in.ltration for 9 h. The interaction between adjacent grains after surface nanocrystallization leads to a region of the magnetic domain wall structure located at the grain boundary, which causes the remanence enhancement effect.
Abstract：Surface nanocrystallization of pure Fe was performed using an improved surface treatment process. The phase transfor-mation and Si in.ltration depth of the pure Fe before and after surface mechanical attrition treatment (SMAT) were compared by X-ray diffraction, scanning electron microscopy and energy-dispersive X-ray spectroscopy. The results indicated that nanocrystallization of Fe surface was achieved using SMAT, which resulted in deeper penetration of Si. Prolonging time of SMAT and Si in.ltration also resulted in increasing microhardness, with the hardness .rst increasing with increasingdistance from the surface and then decreasing. Furthermore, longer Si in.ltration time, nanocrystallization of Si and longer SMAT time resulted in higher saturation magnetization (MS). The greatest Si penetration depth (150 lm), maximum hardness (280 HV), and maximum MS (1.849 9 106 A/m) were achieved after SMAT for 45 min and Si in.ltration for 9 h. The interaction between adjacent grains after surface nanocrystallization leads to a region of the magnetic domain wall structure located at the grain boundary, which causes the remanence enhancement effect.
LI Xu. Effect of surface self-nanocrystallization and Si infiltration on Si diffusion behavior, hardness and magnetic properties of pure Fe[J]. Journal of Iron and Steel Research International, 2018, 25(9): 923-931.
[1]
X.X. Luo, Z.J. Yao, P.Z. Zhang, Y. Chen, H.Q. Yang, W.U. Xiao-Feng, Z.L. Zhang, Y.H. Lin, X.U. Shang-Jun, Transactions of Nonferrous Metals Society of China, 25 (2015) 3694-3699.
2018, Vol. 25 
