|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Advanced Magnetic Materials for Energy and Power Conversion Applications
||Coercivity Development in Mn-Al Alloys with Multi Elemental Additions
||Rajasekhar Madugundo, Ana María Schönhöbel, Daniel Salazar Jaramillo, Jose Manuel Barandiaran, George C. Hadjipanayis
|On-Site Speaker (Planned)
Search for rare-earth (RE) free permanent magnets prompted by the recent RE-crisis generated a renewed interest in Mn-Al based alloys. They present hard magnetic properties in the tetragonal τ-MnAl phase with high uniaxial magnetocrystalline anisotropy (<I>H</I><SUB>a</SUB>≈ 4T) and a theoretical energy product (<I>BH</I>)</SUB>max</SUB>≈ 96kJm<SUP>-3</SUP>. This alloy is a suitable candidate for magnets with medium range performance between alnico and RE-based magnets. The τ-phase is metastable, and the challenge in these alloys is to develop higher coercivity (>0.5T) while keeping a high volume fraction of the τ-phase. We have chosen Mn-Al-Ti-(Cu/Ni/Ga)-C alloys to study the effect of multi elemental addition on coercivity and τ-phase stability. The alloys prepared by arc-melting were subjected to different annealing procedures to obtain maximum τ-phase fraction. Fine powders of the alloys were obtained by different milling techniques with different success to obtain a maximum coercivity. The results will be presented and discussed in detail.
||Planned: Supplemental Proceedings volume