Microstructure and Magnetocaloric Effect by Doping C in La-Fe-Si Ribbons

The melt-spun ribbons of LaFe11.5Si1.5Cx (x = 0, 0.1, 0.2, 0.3) compounds are prepared by the melt fast-quenching method. The doping of C is beneficial to the nucleation and precipitation of the La (Fe, Si)13 phase, which is indicated by the microstructure observation and the elemental analysis. Subsequently, the ribbons of LaFe11.5Si1.5C0.2 are annealed at different times, and the phase composition, the microstructures, and the magnetic properties are investigated. The LaFe11.5Si1.5C0.2 ribbons annealed at 1273 K for 2 h achieved the best magnetic properties, and the maximum isothermal magnetic entropy change with a value of 9.45 J/(kg·K) upon an applied field of 1.5 T at an increased Curie temperature 255 K.

Structure and mechanical properties of rapidly cooled al-based alloys consolidated by high pressure torsion technique

The results of the structural studies and hardness measurements of the samples obtained by high pressure torsion processing of melt-spun ribbons of Al95.8Mn3.8Fe0.4 alloy are presented in the paper. It has been established that straining of the ribbons results in refinement of microstructure and in the increase of microstrain which leads to increase in microhardness by 2.2 times.