Microstructure and coercivity of nitrided Mn-Sn-based alloys

作者：Matsuura Masashi^*; Isogai Keita; Shinaji Keita; Tezuka Nobuki; Sugimoto Satoshi

来源：Journal of Alloys and Compounds, 2014, 605: 208-212.

DOI：10.1016/j.jallcom.2014.03.158

• Transition metal alloys and compounds
• Coercivity
• Microstructure
• Transmission electron microscopy

The microstructure of Mn-Sn-N and Mn-Sn-Co-N alloys was investigated by scanning electron microscopy and transmission electron microscopy (TEM). After the Mn-Sn alloy was annealed at 1000 degrees C under nitrogen, the coercivity increased to 245 kA m (1) and a lamellar structure appeared. The TEM images showed that the lamellar structure contained twins in the perovskite-type phase. After the Mn-Sn-Co alloy was annealed at 900 degrees C and subsequently annealed at 500 degrees C under nitrogen, the coercivity increased dramatically to 1270 kA m (1). A fine two-phase structure consisting of beta-Mn and perovskite-type phases was observed, and some twins were present in the perovskite-type phases. In addition, a higher twin density was observed in the Mn-Sn-Co-N alloy than in the Mn-Sn-N alloy. These results indicate that the twins increased the coercivity of nitrided Mn-Sn based alloys.

• 出版日期2014-8-25