Effect of the simultaneous application of a high static magnetic field and a low alternating current on grain structure and grain boundary of pure aluminum

doi:10.1016/j.jmst.2018.04.013

Abstract

Abstract:

Effect of the simultaneous application of a high static magnetic field and a low alternating electric current on the solidification structure of pure aluminum has been investigated. Results show that the refinement of the solidification structure is enhanced by the electric current under a certain magnetic field. However, when the magnetic field intensity exceeds a certain value, the refinement is impaired under a certain electric current. The observation by electron backscattered diffraction (EBSD) shows the complex fields have led to the increase of the low angle boundaries with the refinement. Moreover, the application of the static gradient magnetic field is capable of modifying the distribution of the refined grains. The above results may be attributed to the formation of the cavities during the electromagnetic vibration process and the high magnetic field.

Key words: Complex fields, High magnetic field, Refinement, Grain boundaries

Chengshuai Li, Shaodong Hu, Zhongming Ren, Yves Fautrelle, Xi Li. Effect of the simultaneous application of a high static magnetic field and a low alternating current on grain structure and grain boundary of pure aluminum[J]. J. Mater. Sci. Technol., 2018, 34(12): 2431-2438.

Figures/Tables 10

Fig. 1. Schematic diagram of the experimental device of metal solidification under the complex fields: 1-Electric pole, 2-sample frame, 3-water-cool cover, 4-heat furnace, 5-superconductor magnet, 6-samples, 7-controlling temperature system, 8-AC electric source.

Fig. 2. Distribution of parameter Bz and Gz (Bz ·dBz/dz) under a 12?T magnetic field. Bz is the vertical component of the magnetic field on the axis of the coil; z is the distance above the center of the coil.

Fig. 3. Effect of the complex fields of a 10?T magnetic field and various alternating currents on the structure of aluminum: (a) B?=?10?T, I?=?0?A; (b) B?=?10?T, I?=?1?A; (c) B?=?10?T, I?=?3?A; (d) B?=?10?T, I?=?10?A.

Fig. 4. Effect of the complex field of a 10?A alternating current and various magnetic fields on the structure of aluminum: (a) B?=?0?T, I?=?10?A; (b) B?=?2?T, I?=?10?A; (c) B?=?6?T, I?=?10?A; (d) B?=?10?T, I?=?10?A.

Fig. 5. Effect of the complex field on the size of the grains: (a) a 5?T magnetic field and various alternating currents; (b) a 10?A alternating current and various magnetic fields.

Fig. 6. Effect of a 10?T magnetic field on the structure of aluminum: (a) B?=?0?T; (b) B?=?10?T.

Fig. 7. EBSD analysis on the structures without and with the complex fields: (a) EBSD orientation map of aluminum fabricated without and with the electric magnetic force: (a) EBSD map; (b) corresponding {001} pole figure, and (c) inverse pole figure: (1) B?=?0?T, I?=?10?A; (2) B?=?10?T, I?=?10?A.

Fig. 8. Misorientation angle distribution of aluminum for the specimens imposed of various complex fields: (a) B?=?0?T, I?=?0?A; (b) B?=?2?T, I?=?10?A; (c) B?=?6?T, I?=?10?A; (d) B?=?10?T, I?=?10?A.

Fig. 9. Microstructure solidified under various complex fields: (a) without the complex fields; (b) a complex field of a uniform magnetic field of Bz?=?10?T and current I?=?10?A; (c) a complex field of a gradient magnetic field of Bz?=?10?T, BzdBz/dz?=?+?400 T2/m and current of I?=?10?A; (d) a complex field of a gradient magnetic field of Bz?=?10?T, Bz·(dBz/dz)?=?-400T2/m and current of I?=?10?A.

Fig. 10. Effect of the electromagnetic force on the structures of pure Al under the gradient magnetic field of Bz?=?10T, Bz·(dBz/dz)?=?+?400T2/m and various currents: I?=?1?A (a); I?=?3?A (b); I?=?5?A (c); I?=?7?A (d).

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