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Investigation of microstructural influence on entropy change in magnetocaloric polycrystalline samples of NiMnGaCu ferromagnetic shape memory alloy
Journal of Materials Research and Technology ( IF 6.4 ) Pub Date : 2019-12-30 , DOI: 10.1016/j.jmrt.2019.12.057
E. Villa , C. Tomasi , A. Nespoli , F. Passaretti , G. Lamura , F. Canepa

Among NiMnGa-based quaternary systems, NiMnGaCu exhibits an interesting giant magnetocaloric effect thanks to the temperature overlapping of magnetic transition and thermoelastic martensitic transformation (TMT), in particular for compositions with ≈6 at% Cu content. In the present work polycrystalline alloy samples with Ni50Mn18.5Cu6.5Ga25 chemical composition were prepared. We present an extensive calorimetric and structural characterization to explore the correlation between microstructural properties and magnetocaloric response induced by means of selected thermal treatments, likely driven by the contribution of TMT to the magnetocaloric effect. Our results give important hints on how the efficiency of the martensitic transition and its modulation in temperature has a final effect on the total ΔS change.



中文翻译:

NiMnGaCu铁磁形状记忆合金的磁热多晶样品中微观结构对熵变的影响研究

在基于NiMnGa的四元体系中,由于磁性跃迁和热弹性马氏体相变(TMT)的温度重叠,NiMnGaCu表现出有趣的巨大磁热效应,特别是对于含Cu含量约6%的合金而言。在本工作中,Ni 50 Mn 18.5 Cu 6.5 Ga 25的多晶合金样品制备化学成分。我们提出了广泛的量热和结构表征,以探索微观结构性质与通过选定的热处理方法诱导的磁热响应之间的相关性,这可能是由于TMT对磁热效应的贡献所致。我们的结果为马氏体转变的效率及其温度调制如何对总ΔS变化产生最终影响提供了重要提示。

更新日期:2019-12-31
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