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首页> 外文期刊>Journal of Applied Physics >Deformation twinning in Ni-Mn-Ga micropillars with 10M martensite
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Deformation twinning in Ni-Mn-Ga micropillars with 10M martensite

机译：Ni-Mn-Ga微柱与10M马氏体的变形孪晶

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摘要

The maximum actuation frequency of magnetic shape-memory alloys (MSMAs) significantly increases with decreasing size of the transducer making MSMAs interesting candidates for small scale actuator applications. To study the mechanical properties of Ni-Mn-Ga single crystals on small length scales, two single-domain micropillars with dimensions of 10×15×30 μm~3 were fabricated from a Ni-Mn-Ga monocrystal using dual beam focused ion beam machining. The pillars were oriented such that the crystallographic c direction was perpendicular to the loading direction. The pillars were compressed to maximum stresses of 350 and 50 MPa, respectively. Atomic force microscopy and magnetic force microscopy were performed prior to fabrication of the pillars and following the deformation experiments. Both micropillars were deformed by twinning as evidenced by the stress-strain curve. For one pillar, a permanent deformation of 3.6% was observed and ac twins (10M martensite) were identified after unloading. For the other pillar, only 0.7% remained upon unloading. No twins were found in this pillar after unloading. The recovery of deformation is discussed in the light of pseudoelastic twinning and twin-substrate interaction. The twinning stress was higher than in similar macroscopic material. However, further studies are needed to substantiate a size effect.
机译：磁性形状记忆合金（MSMA）的最大激励频率随着换能器尺寸的减小而显着增加，这使得MSMA对于小型激励器应用成为有趣的候选者。为了研究小长度尺度下Ni-Mn-Ga单晶的力学性能，利用双束聚焦离子束从Ni-Mn-Ga单晶制备了两个尺寸为10×15×30μm〜3的单畴微柱。加工。定向柱，使得晶体学c方向垂直于加载方向。支柱被压缩到最大应力分别为350和50 MPa。在制造柱之前和在变形实验之后进行原子力显微镜和磁力显微镜。如应力-应变曲线所示，两个微柱都通过孪生变形。对于一个支柱，观察到永久变形为3.6％，卸载后鉴定出交流孪晶（10M马氏体）。对于另一个支柱，卸货时仅剩下0.7％。卸货后在此支柱上未发现任何双胞胎。结合伪弹性孪晶和双基体相互作用讨论了变形的恢复。孪生应力高于类似的宏观材料。但是，需要进一步的研究来证实尺寸效应。

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  • 来源
    《Journal of Applied Physics》 |2009年第5期|053906.1-053906.6|共6页
  • 作者

    M. Reinhold; D. Kiener; W. B. Knowlton; G. Dehm; P. Muellner;

  • 作者单位

    Department of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, USA;

    Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, 8700 Leoben, Austria;

    Department of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, USA Department of Electrical and Computer Engineering, Boise State University, Boise, Idaho 83725, USA;

    Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, 8700 Leoben, Austria Department Materials.Montanuniversitdt Leoben, 8700 Leoben, Austria;

    Department of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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