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In situ Observation of Phase Transformation in MnAl(C) Magnetic Materials.


ABSTRACT: The phase transformation in two modes, including both displacive and massive growth of τ-phase from ε-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 τ-phase with high saturation magnetization was obtained.

SUBMITTER: Si PZ 

PROVIDER: S-EPMC5615671 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature

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In situ Observation of Phase Transformation in MnAl(C) Magnetic Materials.

Si Ping-Zhan PZ   Qian Hui-Dong HD   Choi Chul-Jin CJ   Park Jihoon J   Han Sangho S   Ge Hong-Liang HL   Shinde Kiran P KP  

Materials (Basel, Switzerland) 20170831 9


The phase transformation in two modes, including both displacive and massive growth of τ-phase from ε-MnAl(C), was observed by <i>in situ</i> transmission electron microscopy. The exact temperature range for different phase transformation modes was determined by magnetic measurements. The displacive growth of ε→τ in Mn<sub>54</sub>Al<sub>46</sub> (or Mn<sub>54</sub>Al<sub>46</sub>C<sub>2.44</sub>) occurs at temperatures below 650 K (or 766 K), above which both modes coexist. One-third or less of  ...[more]

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