Influence of annealing temperatures on the magnetostructural transition and magnetocaloric effect of Ni40Co10Mn40Sn10 powders
Influence of annealing temperatures on the magnetostructural transition and magnetocaloric effect of Ni40Co10Mn40Sn10 powders
复制标题
退火温度对Ni40Co10Mn40Sn10粉末磁结构转变和磁热效应的影响
DOI：
10.1016/j.jallcom.2016.08.253
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发表时间：
2017-01
影响因子：
6.2
通讯作者：
Jiang Chengbao
中科院分区：
文献类型：
--
作者：
Wang Xinlei;Sun Fang;Wang Jingmin;Yu Qian;Wu Yuye;Hua Hui;Jiang Chengbao
研究了Ni40Co10Mn40Sn10合金块体和粉末的相结构、磁结构转变行为以及相关的磁热效应，重点研究了573~773 K范围内退火温度的影响。一个非调制马氏体结构中检测到的散装和作为地面粉末，但七层正交结构退火后观察到。在研磨和退火粉末中也证实了块体合金中从弱磁性马氏体到铁磁性奥氏体的磁结构转变。与块体合金相比，球磨态粉末的相变温度明显降低，相变温度滞后变宽，相变过程中的磁化强度变化严重减小。随着退火温度的升高，磁结构转变参数逐渐改善。当粉末在773 K退火时，磁结构转变表现得最类似于块体合金。因此，在5T磁场下获得的27J/（Kg K）的大磁熵变和171.3J/Kg的有效冷却能力非常接近块体合金。考虑内部应力和表面效应来理解所观察到的现象。
The phase structure, the magnetostructural transition behavior and the associated magnetocaloric effect have been investigated in Ni40Co10Mn40Sn10bulk and powders, mainly focusing on the effects of annealing temperatures ranging from 573 K to 773 K. A non-modulated martensitic structure was detected in the bulk and as-ground powders, but a seven-layered orthorhombic structure was observed after annealing. The magnetostructural transition in the bulk alloy from weak magnetic martensite to ferromagnetic austenite was also confirmed in the as-ground and annealed powders. Compared with the bulk alloy, the transition temperatures of the as-ground powders decreased markedly; the transition temperature hysteresis broadened, and the magnetization change across the transition was severely reduced. With increasing annealing temperatures, the parameters of the magnetostructural transition gradually improved. When the powders were annealed at 773 K, the magnetostructural transition behaved the most similar to the bulk alloy. Consequently, the large magnetic entropy change of 27 J/(Kg K) and the effective cooling capacity of 171.3 J/Kg that were obtained under the magnetic field of 5 T were very close to the bulk alloy. The internal stress and surface effects were considered to understand the observed phenomena.
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影响因子：
3.2
作者：
Y. B. Yang;X. Ma;X. G. Chen;Jun Wei;R. Wu;Jingzhi Han;H. Du;Changsheng Wang;Sheng-gen Liu;Yuchao Yang;Y. Zhang;J. Yang
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作者：
S. Agarwal;E. Stern-Taulats;L. Mañosa;P. Mukhopadhyay
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