MAGNETIC PROPERLIES AND STRUCTURE OF A MIXTURE OF α-Fe and Fe_3N DURING MECHANICAL ALLOYING PROCESS
XU Hui;HE Kaiyuan;CHENG Lizhi (Department of Materials Science and Engineering; Northeast University; Shenyang 110006)
Cite this article:
XU Hui;HE Kaiyuan;CHENG Lizhi (Department of Materials Science and Engineering; Northeast University; Shenyang 110006). MAGNETIC PROPERLIES AND STRUCTURE OF A MIXTURE OF α-Fe and Fe_3N DURING MECHANICAL ALLOYING PROCESS. Acta Metall Sin, 1998, 34(1): 86-90.
Abstract The X-ray diffraction was used to monitor the structure change of a mixture of α-Fe and Fe3N powders during ball milling. The change of saturation magnetization of the mixture powder was also measured. The results showed that Fe3N decomposed quickly with increasing milling time and disappeared after milling for 2 h, and some N atoms soluted in α-Fe. After milling for 24 h, a stable supersaturation solid solution was obtained. N content was about 0.290%-0.346%. With increasing milling time, the grain size decreased. After milling for 24 h, grain size reached a constant which is about 8 urn. The sites of N atoms nearby Fe atom changed during milling, so the saturation magnetization of the mixture powder initially decreased, but began to increase when milling time exceeded 5 h, and reached a constant when milling time exceeded 24 h.
