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Meeting 2016 TMS Annual Meeting & Exhibition
Symposium Bulk Processing of Nanostructured Powders and Nanopowders by Consolidation
Presentation Title Structural and Magnetic Properties of MnBi Extrudates
Author(s) Xiujuan Jiang, Mike Dahl, Wei Xie, Matthew J. Kramer, Jun Cui
On-Site Speaker (Planned) Xiujuan Jiang
Abstract Scope MnBi, due to its superplasticity at temperatures of 200C 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.
Proceedings Inclusion? Planned: A print-only volume


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Progress Towards Development of Nanostructured Magnesium Alloys and Composites: Understanding of Magnesium Strengthening by Solid Solutioning and Grain Size Reduction
Shock Wave Consolidation of Hierarchical Copper Powders Consisting of Nano/Ultrafine Particles and Micro Agglomerates, and the Mechanical Properties of Synthesized Bulk
Spark Plasma Heat Treated Coarse- and Nano-powder ZrB2-SiC and HfB2-SiC Composites
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Spark Plasma Sintering (SPS) vs. Hot Isostatic Pressing (HIP) of Nanostructured Aluminum Alloy Powders
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Surface Energetics Studies of Nanomaterials
Synthesis and Consolidation of Nanocrystalline Fe-10Cr-3Al Alloy Powder
Synthesis and Morphology Characterization of Nanocrystalline ZnO Powder Fabricated by a Green Low Temperature Route
Synthesis of Porous Boron Nitride Nanosheets with High Pore Volume
Synthesis of Quasi-Nano-sized Ni-Zn-X-Ferrites (Gd, Cu, Mg) by Using Combustion Synthesis and Improvement of Purity by Wet Process
The Effect of Er on Grain Growth in Cryomilled Al-Mg-Er Powders
The Influence of Heat Treatment Temperatue on the Bulk Cu-Al/B4C Prepared by Spark Plasma Sintering
The Key Issues in Fabrication of Ultrafine Structured Metallic Materials and Metal Matrix Nanocomposites by Thermomechanical Consolidation of Nanostructured Powders
TiO2-CeO2Nano Crystalline Powders and Thin Films by an Aqueous Sol-Gel Process: Effect of Ce:Ti Molar Ratio on Microstructure and Physical Properties
Tri-modal Composites: A Review
Two-Stage Sintering of Nano-sized Yttria Stabilized Zirconia with Polymer Sphere Generated Porosity

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