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Ni46Mn35Ga19單晶大的磁熵變和磁控形狀記憶效應(yīng)
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Large Magnetic Entropy Change and Magnetic-Controlled Shape Memory Effect in Single Crystal Ni46Mn35Ga19
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Science Technology of Education Committee of Chongqing(KJ070817); Natural Science Foundation Project of Chongqing(CSTC 2007BB4232); Science and Technology of Chongqing(CSTC 2008AC4011)

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    摘要:

    采用多種測(cè)量手段，對(duì)制備出的轉(zhuǎn)變溫度在室溫以上的Ni46Mn35Ga19 單晶的物性進(jìn)行表征。電阻和交流磁化率結(jié)果表明，該材料的磁轉(zhuǎn)變和馬氏體相變是同時(shí)發(fā)生的。定溫磁化強(qiáng)度測(cè)量得出材料磁熵變的增長(zhǎng)速率高達(dá)9.0 J/kg·K·T，在1274 kA/m（1.6 T）的磁場(chǎng)下，磁熵變達(dá)13.8 J/kg·K。此外，應(yīng)變測(cè)量表明，伴隨該磁熵變，材料展現(xiàn)出應(yīng)變量分別高達(dá)–0.89%和–1.90%的自發(fā)和磁控雙向形狀記憶效應(yīng)

    Abstract:

    Physical properties of Ni46Mn35Ga19 single crystal with transition temperatures above room temperature were investigated by various measuring methods. The measuring results of the resistance and ac susceptibility indicate that the magnetic transition and martensitic transformation can occur simultaneously in this alloy. The measurements of the isothermal magnetization show that the increasing rate of magnetic entropy change in this alloy is 9.0 J / kg·K·T. A large magnetic entropy change of 13.8 J/kg·K is obtained under the field of 1.6 T in the single crystal. Furthermore, the strain measurement shows that accompanying with magnetic entropy change, the alloy exhibits a large spontaneous transition strain of –0.89% and a large magnetic-field-enhanced strain of –1.90%.

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崔玉亭,游素琴,武 亮,馬 勇,孔春陽(yáng),楊曉紅,潘復(fù)生. Ni46Mn35Ga19單晶大的磁熵變和磁控形狀記憶效應(yīng)[J].稀有金屬材料與工程,2010,39(2):189~193.[Cui Yuting, You Suqin, Wu Liang, Ma Yong, Kong Chunyang, Yang Xiaohong, Pan Fusheng. Large Magnetic Entropy Change and Magnetic-Controlled Shape Memory Effect in Single Crystal Ni46Mn35Ga19[J]. Rare Metal Materials and Engineering,2010,39(2):189~193.]
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  • 收稿日期:2009-09-18
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