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單晶Ni52Mn16．4Fe8Ga23．6的磁控形狀記憶效應(yīng)和磁感生應(yīng)變
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TG139.6

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"國(guó)家自然科學(xué)基金"資助(50131010)


Field-Controlled Shape Memory Effect and Temperature Stability of the Magnetic-Field-Induced Strain in Ni52Mn16.4Fe8Ga23.6 Single Crystal
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    摘要:

    用磁懸浮冷坩堝提拉設(shè)備沿[001]方向生長(zhǎng)了組分為Ni52Mn16.4Fe8Ga23.6的單晶，通過(guò)磁增強(qiáng)相變應(yīng)變和磁感生應(yīng)變的測(cè)量研究了該材料磁控形狀記憶效應(yīng)和磁感生應(yīng)變的溫度穩(wěn)定性。結(jié)果發(fā)現(xiàn)該材料不但具有大的自發(fā)相變應(yīng)變、磁增強(qiáng)相變應(yīng)變和磁感生應(yīng)變，而且磁感生應(yīng)變具有很好的溫度穩(wěn)定性，從265K到100K，飽和磁感生應(yīng)變的最大減小量不超過(guò)10％。另外，實(shí)驗(yàn)也發(fā)現(xiàn)磁感生應(yīng)變量最大的方向是沿晶體母相的[001]方向(即單晶生長(zhǎng)方向)。根據(jù)合金形狀記憶的特點(diǎn)和磁場(chǎng)誘導(dǎo)應(yīng)變的機(jī)理對(duì)實(shí)驗(yàn)結(jié)果進(jìn)行了分析和討論。

    Abstract:

    Ferromagnetic Ni-Mn-Fe-Ga single crystal of a pseudoquaternary Heusler alloy has been invested as a new magnetic field control actuator material. A single crystal of Ni52Mn16.4Fe8Ga23.6 was grown in [001] direction of the cubic parent phase by the Czochralski method. The field-controlled shape memory effect and the temperature dependent of the magnetic-field-induced strain (MFIS) in Ni52Mn16.4Fe8Ga23.6 single crystal were investigated by measuring the field enhanced transformation strain and the MFIS with a magnetic field applied in different directions. The results show that such material combined with the martensitic transformation can produce the large field-enhanced transformation strain and the large MFIS. It is found that the MFIS is almost temperature independent, the maximum decreasing magnitude of the saturated MFIS is less than 10% from 265 K to 100 K. In addition, the direction in which the MFIS has the largest value is always the [001], namely the growth direction of the crystals. The results are discussed with reference to the shape memory characteristics of the alloys and the mechanism of the preferentially orientation of martensitic variants.

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崔玉亭 王萬(wàn)錄 廖克俊 朱亞波.單晶Ni52Mn16．4Fe8Ga23．6的磁控形狀記憶效應(yīng)和磁感生應(yīng)變[J].稀有金屬材料與工程,2005,34(2):266~270.[Cui Yuting, Wang Wanlu, Liao Kejun, Zhu Yubo . Field-Controlled Shape Memory Effect and Temperature Stability of the Magnetic-Field-Induced Strain in Ni52Mn16.4Fe8Ga23.6 Single Crystal[J]. Rare Metal Materials and Engineering,2005,34(2):266~270.]
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