Title :
LaFe11.6 Si1.4/Cu Magnetocaloric Composites Prepared by Hot Pressing
Author :
Liu, J. ; Zhang, M.X. ; Shao, Y.Y. ; Yan, A.R.
Author_Institution :
Key Lab. of Magn. Mater. & Devices, Ningbo Inst. of Mater. Technol. & Eng., Ningbo, China
Abstract :
We report on the microstructure, phase constitution, mechanical properties, and magnetocaloric effect (MCE) of Cu-bonded La(Fe,Si)13 composites prepared by hot pressing (HP) at different temperatures. It was found that the final density of composites greatly relies on the initial powder size and pressing temperature. Finer powders lower the temperature needed for fully compacting. HP at 700 °C suits finer La(Fe,Si)13 powders to approach the theoretical density and high mechanical strength, and 800 °C for coarse powders. At the same time, the drastic diffusion reaction takes place at evaluated temperature due to Cu-La eutectic point. Combined with the influence of press-induced grain breaking, the MCE was decreased with respect to the pure La(Fe,Si)13 phase.
Keywords :
compaction; copper; diffusion; eutectic structure; fracture toughness; hot pressing; iron alloys; lanthanum alloys; magnetocaloric effects; micromechanics; particle reinforced composites; particle size; silicon alloys; Cu-La eutectic point; Cu-bonded La(FeSi)13 composites; LaFe11.6Si1.4-Cu; compaction; diffusion reaction; hot pressing; initial powder size; magnetocaloric composites; mechanical properties; mechanical strength; microstructure; phase constitution; press-induced grain breaking; pressing temperature; temperature 700 degC; temperature 800 degC; Magnetic hysteresis; Magnetic materials; Magnetomechanical effects; Microstructure; Powders; Pressing; Temperature; Composites; Hot pressing; La-Fe-Si; La???Fe???Si; composites; hot pressing (HP); magnetocaloric effect; magnetocaloric effect (MCE);
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2015.2436902
