|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Bulk Processing of Nanostructured Powders and Nanopowders by Consolidation
||Structural and Magnetic Properties of MnBi Extrudates
||Xiujuan Jiang, Mike Dahl, Wei Xie, Matthew J. Kramer, Jun Cui
|On-Site Speaker (Planned)
MnBi, due to its superplasticity at temperatures of 200°C and above, is an ideal candidate for thermal-mechanical fabrication with large deformation ratio. In this work, warm extrusion was used to obtain dense bulk materials with desired texture. MnBi powders were compacted into an Al can and underwent extrusion under a predetermined condition. Magnetic properties investigated using vibrating sample magnetometer showed a remanence ratio of 0.7 along the radial direction indicating texture. Annealing, performed at temperatures of 200 °C, 245 °C, 285 °C and 305 °C, resulted in an unusual trend in both magnetization and coercivity. The microstructure obtained from scanning electron microscopy and transmission electron microscopy was able to explain the unusual magnetic behavior. Specifically, magnetization and coercivity variations were attributed to the changes in phase content and grain boundary conditions. The reversible temperature coefficient of remenance is found to be -0.09 %/°C and the coercivity counterpart is 5 %/°C.
||Planned: A print-only volume