Iron nitrides were manufactured by mechanical alloying of Fe2.33N and Fe powder mixtures at starting compositions of Fe12N2 and Fe16N2 and annealed in air at 200 and 240°C. It was found that the supersaturated nanocrystalline α-Fe solid solution phase was produced after MA, and iron nitrides were formed after heat treatment. The saturation magnetization (σ) of the heat-treated powders is higher than those of the as-milled powders. The σ values for the specimens heat treated at 200°C are higher than those heat treated at 240°C, and the highest value among all of the samples is 218 e.m.u./g which is obtained by annealing of as-milled Fe12N2 powders in air at 200°C for 6 hours. The possible existence of the α"-Fe16N2 phase is responsible for the high saturation magnetization in mechanically alloyed Fe16N2 and Fe12N2 powders.
|頁（從 - 到）||753-760|
|期刊||Journal of the Chinese Institute of Engineers, Transactions of the Chinese Institute of Engineers,Series A/Chung-kuo Kung Ch'eng Hsuch K'an|
|出版狀態||已發佈 - 11月 2001|
ASJC Scopus subject areas
- 工程 (全部)