A high-temperature coupling of martensitic and magnetic transformations and magnetic entropy change in Ni-Fe-Ga-Co alloys

作者：Liu Jian^*; Scheerbaum Nils; Hinz Dietrich; Gutfleisch Oliver

来源：Scripta Materialia, 2008, 59(10): 1063-1066.

DOI：10.1016/j.scriptamat.2008.07.019

• Ni-Fe-Ga-Co
• Magnetic shape memory alloy
• Magnetic entropy change

A coupling of martensitic and magnetic transformations at similar to 90 degrees C is found in Ni52Fe17Ga27Co4 alloy. Ageing at 300 or 400 degrees C has a weak effect on transformation temperatures, but significantly increases the martensitic transformation interval and hysteresis, as well as the temperature hysteresis of magnetization. Magnetic entropy changes are investigated in samples with well-coupled magnetostructural transitions. Ageing at 500 degrees C causes the formation of 7 phase precipitates.

• 出版日期2008-11