Pd(2) MnGa Metamagnetic Shape Memory Alloy with Small Energy Loss.
Pd(2) MnGa Metamagnetic Shape Memory Alloy with Small Energy Loss.
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DOI：
10.1002/advs.202207779
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发表时间：
2023-08
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影响因子：
--
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中科院分区：
文献类型：
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超磁形状记忆合金（mmsma）由于其独特的性能，如磁应变、磁电阻和由磁场诱导跃迁引起的磁热效应，是一种有吸引力的功能材料。然而，这些合金在马氏体相变过程中的能量损失（即耗散能）有时较大，限制了它们的应用。本文报道了一种具有极小E分布和磁滞的新型Pd2MnGa Heusler型MMSMA。研究了时效Pd2MnGa合金的显微组织、晶体结构、磁性能、马氏体相变和磁场感应应变。127.4 K时，马氏体由L21组织转变为10M组织，热滞后较小，为1.3 K。在120 K时，施加较小的磁滞（= 0.3 J mol−1）和较小的磁滞（= 7 kOe）的磁场，可以诱导反向马氏体转变。较低的E - dis值和迟滞可能是由于马氏体相变中良好的晶格相容性。记录到0.26%的大磁场感应应变，表明所提出的MMSMA作为致动器的潜力。具有低E - dis和低磁滞的Pd2MnGa合金可能为高效的mmsma提供新的可能性。超磁形状记忆合金（mmsma）作为一种多功能材料，如磁致动器和环境友好型磁制冷材料，越来越受到人们的关注。但相变过程中能量损失大，阻碍了其应用。在这项研究中，开发了一种能量损耗极小的新型Pd2MnGa MMSMA，这可能会导致高效率。
Metamagnetic shape memory alloys (MMSMAs) are attractive functional materials owing to their unique properties such as magnetostrain, magnetoresistance, and the magnetocaloric effect caused by magnetic‐field‐induced transitions. However, the energy loss during the martensitic transformation, that is, the dissipation energy, E dis, is sometimes large for these alloys, which limits their applications. In this paper, a new Pd2MnGa Heusler‐type MMSMA with an extremely small E dis and hysteresis is reported. The microstructures, crystal structures, magnetic properties, martensitic transformations, and magnetic‐field‐induced strain of aged Pd2MnGa alloys are investigated. A martensitic transformation from L21 to 10M structures is seen at 127.4 K with a small thermal hysteresis of 1.3 K. The reverse martensitic transformation is induced by applying a magnetic field with a small E dis (= 0.3 J mol−1 only) and a small magnetic‐field hysteresis (= 7 kOe) at 120 K. The low values of E dis and the hysteresis may be attributed to good lattice compatibility in the martensitic transformation. A large magnetic‐field‐induced strain of 0.26% is recorded, indicating the proposed MMSMA's potential as an actuator. The Pd2MnGa alloy with low values of E dis and hysteresis may enable new possibilities for high‐efficiency MMSMAs. Metamagnetic shape memory alloys (MMSMAs) are attracting attention as multifunctional materials, such as magnetic actuators and environment‐friendly magnetorefrigeration materials. However, the large energy loss during the phase transformation hinders their applications. In this study, a novel Pd2MnGa MMSMA with extremely small energy loss, which may lead to high efficiency, has been developed.
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DOI：
10.1016/0001-6160(54)90163-7
发表时间：
1954-01-01
期刊：
ACTA METALLURGICA
影响因子：
--
作者：
BOWLES, JS;MACKENZIE, JK
通讯作者：
MACKENZIE, JK
影响因子：
6.2
作者：
Aaltio, Ilkka;Fukuda, Takashi;Kakeshita, Tomoyki
通讯作者：
Kakeshita, Tomoyki
影响因子：
41.2
作者：
Chen, Haiyang;Wang, Yan-Dong;Ren, Yang
通讯作者：
Ren, Yang
影响因子：
64.8
作者：
Kainuma, R;Imano, Y;Ishida, K
通讯作者：
Ishida, K
影响因子：
4
作者：
Ito, Wataru;Ito, Kouhei;Kanomata, Takeshi
通讯作者：
Kanomata, Takeshi