TY - JOUR
T1 - Microstructure and coercivity of nitrided Mn-Sn-based alloys
AU - Matsuura, Masashi
AU - Isogai, Keita
AU - Shinaji, Keita
AU - Tezuka, Nobuki
AU - Sugimoto, Satoshi
N1 - Funding Information:
This study was partially supported by JST-CREST and ESICMM . The authors would like to thank Dr. K. Kobayashi of Tohoku University for his assistance in TEM observation.
PY - 2014/8/25
Y1 - 2014/8/25
N2 - 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 °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 °C and subsequently annealed at 500 °C under nitrogen, the coercivity increased dramatically to 1270 kA m-1. A fine two-phase structure consisting of β-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.
AB - 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 °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 °C and subsequently annealed at 500 °C under nitrogen, the coercivity increased dramatically to 1270 kA m-1. A fine two-phase structure consisting of β-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.
KW - Coercivity
KW - Microstructure
KW - Transition metal alloys and compounds
KW - Transmission electron microscopy
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U2 - 10.1016/j.jallcom.2014.03.158
DO - 10.1016/j.jallcom.2014.03.158
M3 - Article
AN - SCOPUS:84899566524
SN - 0925-8388
VL - 605
SP - 208
EP - 212
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -