Tuning magnetostructural transition and the associated giant magnetocaloric effect via thermal treatment in MnCoGe-based alloys

•Tuning the stress state by controlling annealing and cooling modes.•High-degree stress-relaxation induces sharper transition, higher Tt, lower thermal hysteresis and higher field-sensitivity.•Giant MCEs observed at different temperatures for the samples with different thermal treatments. The change...

Full description

Saved in:
Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2019-01, Vol.469, p.437-442
Main Authors: Zhang, C.L., Nie, Y.G., Shi, H.F., Ye, E.J., Han, Z.D., Wang, D.H.
Format: Article
Language:English
Subjects:
Annealing furnaces
Cooling
Electromagnetism
Ferrites
Gamma rays
Heat treatment
Magnetism
Magnetocaloric effect
Magnetostructural transition
Manganese base alloys
Stress relaxation
Transition temperature
Water quenching
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•Tuning the stress state by controlling annealing and cooling modes.•High-degree stress-relaxation induces sharper transition, higher Tt, lower thermal hysteresis and higher field-sensitivity.•Giant MCEs observed at different temperatures for the samples with different thermal treatments. The changes in magnetostructural transition behaviors and magnetocaloric effect with different stress states were studied by controlling the annealing and cooling processes for Mn1−xCo1+xGe alloys. Water quenching inhibits the structural transition in the investigated composition and temperature ranges, while furnace cooling results in coupled magnetostructural transitions. An additional annealing at an intermediate temperature followed by program-controlled slow cooling results in sharper transition, higher transition temperature, lower thermal hysteresis, higher field-sensitivity, and higher entropy change. Giant magnetocaloric effects were observed at different temperature regions for the samples subjected to different thermal treatments.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2018.09.016