Relation between solidification microstructure and coercivity in MnAl permanent-magnet alloys

TL;DR: Manganese-based permanent magnetic materials have become an area of significant research activity in recent years as a potential alternative to permanent magnets based on rare Earth (RE) metals as discussed by the authors.

TL;DR: In this paper, a rhombohedral nanoprecipitates with the size of ∼20nm was introduced into L10 MnAl alloys via doping 0.2 at and melt spinning technology.

TL;DR: In this article, the microstructure, phase transformation and magnetic properties of MnAl permanent magnetic alloys prepared by the melt-spinning technique were systematically investigated by tuning the cooling rate.

TL;DR: In this paper , the authors studied the phase transformation processes of ε → τ by transmission electron microscopy and found that the order-twin boundary has a more significant effect on promoting the nucleation and propagation of the reversal domain, giving rise to a severe degradation effect on coercivity.

TL;DR: In this paper, a new compound composed of Nd, Fe, and a small quantity of B (about 1 wt. %) has been found, which has a tetragonal structure with lattice constants a=0.880 nm and c=1.221 nm.

TL;DR: In this paper, the properties of a new class of high performance permanent magnets prepared from Nd•Fe•B and Pr•Fe‐B alloys are reported. Magnetic hardening is achieved by rapid solidification Energy products of these isotropic materials can exceed 14 MGOe with intrinsic coercivities of ∼15 kOe X-ray and microstructural analyses indicate that the alloys exhibiting optimum characteristics are comprised of roughly spherical crystallites, strongly suggesting that the coercivity mechanism is of the singledomain particle type.

TL;DR: In this article, a general framework is proposed to relate tip radius, interface undercooling and primary arm spacing in alloy dendrite growth, and all the growth morphologies developed between the limiting morphology at low and at high velocity are described to a first approximation, using an ellipsoid of revolution.