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    【24h】Modification of the Properties of Ni-Mn-Ga Magnetic Shape Memory Alloys by Minor Addition of Terbium

    机译微量Min对Ni-Mn-Ga磁性形状记忆合金性能的影响

    【摘要】Effect of terbium addition on the structure, phase constitution and hardness of the Ni_(49)Mn_(29)Ga_(22) alloy was studied. The Tb content varied in the range of 0 - 2 at.%. It was found that the Tb addition substantially refines the grain size, which dropped from 200 - 400 μm, for the Tb-free alloy, down to 30-50 μm for the 2 at.% Tb material. The terbium exhibited negligible solubility in the matrix phase and formed grain boundary layer. The mean composition of the boundary layer was: Tb - 16, Ni - 55, Mn - 7 and Ga - 22 at.%. The phase analysis revealed the presence of the following major phases in the alloys: Ni_2MnGa, Ni_3Ga. All the alloys studied exhibited martensitic structure at room temperature. The Tb addition did not affect the Curie temperature, which is consistent with the finding that Tb does not dissolve in the Ni_2MnGa phase. However, it was found that Tb addition changed the phase transformations temperatures. The A_s temperature (martensite-to-austenite transformation starting temperature) and M_s temperature (martensite-to-austenite starting temperature) grow slightly for low Tb concentrations and subsequently decrease for higher the Tb contents. The Tb containing alloys exhibited increased hardness, by about 40%, which was apparently caused by the grain refinement. No significant effect of the Tb addition on the magnetic shape memory effect was observed.

    【摘要机译】研究了addition对Ni_(49)Mn_(29)Ga_(22)合金的组织,相组成和硬度的影响。 Tb含量在0-2at。%的范围内变化。已经发现,添加Tb可以显着细化晶粒尺寸,对于无Tb合金,晶粒尺寸从200-400μm降低,对于2 at。%Tb材料,晶粒尺寸降低至30-50μm。 in在基质相和形成的晶界层中的溶解度可忽略不计。边界层的平均组成为:Tb-16,Ni-55,Mn-7和Ga-22at。%。相分析表明合金中存在以下主要相:Ni_2MnGa,Ni_3Ga。所有研究的合金在室温下均表现出马氏体结构。 Tb的添加不影响居里温度,这与Tb不溶解在Ni_2MnGa相中的发现是一致的。然而,发现添加Tb改变了相变温度。对于较低的Tb浓度,A_s温度(马氏体向奥氏体转变的起始温度)和M_s温度(马氏体向奥氏体起始温度)略有升高,随后随着Tb含量的升高而降低。含Tb合金的硬度增加了约40%,这显然是由晶粒细化引起的。没有观察到添加Tb对磁性形状记忆效应的显着影响。

    【作者】Marcin Leonowicz;Rafal Wroblewski;Waldemar Kaszuwara;Zhao Zengqi;Jiang Liping;

    【作者单位】Faculty of Materials Science Engineering, Warsaw University of Technology, Pol;

    【年(卷),期】2006(),

    【年度】2006

    【页码】P.61702C.1-61702C.7

    【总页数】7

    【原文格式】PDF

    【正文语种】eng

    【中图分类】TB30;

    【关键词】magnetic shape memory alloys;NiMnGa alloys;Tb addition;

    机译 磁性形状记忆合金; NiMnGa合金; Tb添加;
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