Systematic Trends of Transformation Temperatures and Crystal Structure of Ni–Mn–Ga–Fe–Cu Alloys

Systematic Trends of Transformation Temperatures and Crystal Structure of Ni–Mn–Ga–Fe–Cu Alloys
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Ni-Mn-Ga-Fe-Cu合金相变温度和晶体结构的系统趋势

DOI:
10.1007/s40830-020-00273-3
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发表时间:
2020
影响因子:
2.2
通讯作者:
Heczko, Oleg
Heczko, Oleg
中科院分区:
--
文献类型:
--
作者:
Armstrong, Andrew;Nilsen, Frans;Rames, Michal;Colman, Ross;Vertat, Petr;Kmjec, Tomas;Straka, Ladislav;Mullner, Peter;Heczko, Oleg

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本文系统地研究了Fe和Cu对Ni-Mn-Ga铁磁形状记忆合金磁形状记忆效应相关性能的影响。Fe和Cu是提高Ni-Mn-Ga磁性形状记忆合金马氏体相变温度的潜在协同效应元素。本文研究了18种Cu、Fe替代三元合金的不同系统趋势的Ni-Mn-Ga-Fe-Cu合金。我们发现了一种方法来描述Ni,Mn和Cu的有效性后,提高马氏体相变温度,降低饱和磁化强度,并改变居里温度。发现Ni含量对马氏体相变温度的影响最大,Mn次之,Cu的影响较小。Mn和Cu合金化的饱和磁化强度以相似的系数降低。居里温度随Mn单调降低,但不随Cu单调降低。10 M马氏体结构对于成分Ni46.5Mn25+ XGa 25 −X− YFe3.5CuY是稳定的,其中X和Y的范围为0-5.7和0.8-3.0。元素e/a比值与总e/a比值结合使用,可以深入了解五元MSM合金的复杂行为,是分析MSM合金改善功能性能的有用方法。
Here we report a systematic research on effects of Fe and Cu upon properties relevant for the magnetic shape memory effect of Ni–Mn–Ga ferromagnetic shape memory alloys. Fe and Cu were identified as elements with potential synergism to increase the martensite transformation temperature of Ni–Mn–Ga magnetic shape memory (MSM) alloys. Eighteen Ni–Mn–Ga–Fe–Cu alloys with different systematic trends in substituting the ternary elements with Cu and Fe have been investigated. We found a method to describe the effectiveness of Ni, Mn, and Cu upon raising the martensitic transformation temperature, lowering the saturation magnetization, and varying the Curie temperature. We find the martensite transformation temperature most influenced by the Ni content, followed by Mn, with a smaller effect of Cu. The saturation magnetization decreases with similar coefficients for Mn and Cu alloying. The Curie temperature monotonously decreases with Mn, but not Cu. The 10M martensite structure is stable for the composition Ni46.5Mn25+XGa25−X−YFe3.5CuYwithXandYrange of 0–5.7, and 0.8–3.0. Used in combination with thetotal e/a, theelemental e/a-ratiogives some insight into the complex behavior of quinary MSM alloys and is a useful method of analyzing MSM alloys for improved functional properties.
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