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- Title
In situ Observation of Phase Transformation in MnAl(C) Magnetic Materials.
- Authors
Ping-Zhan Si; Hui-Dong Qian; Chul-Jin Choi; Jihoon Park; Sangho Han; Hong-Liang Ge; Shinde, Kiran P.
- Abstract
The phase transformation in two modes, including both displacive and massive growth of T-phase from E-MnAl(C), was observed by in situ transmission electron microscopy. The exact temperature range for different phase transformation modes was determined by magnetic measurements. The displacive growth of ε→τ in Mn54Al46 (or Mn54Al46C2.44) occurs at temperatures below 650 K (or 766 K), above which both modes coexist. One-third or less of the ε-phase can be transformed into τ-phase via displacive mode while the remaining two-thirds or more via massive mode. In bulk τ-phase, most τ-nanocrystals formed via displacive mode are distributed in the matrix of large τ-grains that formed via massive mode. The typical massive growth rate of the τ-phase is 8-60 nm/s, while the displacive growth rate is low. A more complete understanding of the ε→τ phase transformations in the MnAl-based magnets was provided in this work, based on which the annealing process for ε→τ was optimized and thus high purity T-phase with high saturation magnetization was obtained.
- Subjects
PHASE transitions; STATISTICAL thermodynamics; TRANSMISSION electron microscopy; MAGNETICS; TRANSITION temperature
- Publication
Materials (1996-1944), 2017, Vol 10, Issue 9, p1016
- ISSN
1996-1944
- Publication type
Article
- DOI
10.3390/ma10091016