Superhigh strains by variant reorientation in the nonmodulated ferromagnetic NiMnGa alloys
Superhigh strains by variant reorientation in the nonmodulated ferromagnetic NiMnGa alloys
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DOI：
10.1063/1.1512948
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发表时间：
2002-10-07
影响因子：
4
通讯作者：
Wu, GH
中科院分区：
文献类型：
--
作者：
Jiang, CB;Liang, T;Wu, GH
超高应变的Ni 53 Mn 25 Ga 22和13.5%的Ni 54 Mn 23 Ga 23与非调制马氏体结构的实现通过变量再取向。预制单变体存在强的磁各向异性，其易磁化轴沿着高温立方相的收缩[001]方向。与原始多变量试样相比，发现单变量试样的奥氏体转变温度较高。饱和磁化强度M-s、磁各向异性常数k（u）和孪晶再取向应力σ（tw）的数量级与5 M马氏体相同，分别为57.6 A m（2）/kg、1.4 × 10（5）J/m（3）和约20 MPa，这表明在未调制的NiMnGa合金中预期更高的磁场诱导应变是合理的。(C)2002年美国物理学会。
Superhigh strains of 15% for the Ni53Mn25Ga22 and 13.5% for the Ni54Mn23Ga23 with the nonmodulated martensite structure were achieved by variant reorientation. A strong magnetic anisotropy exists in the prefabricated single variant with the easy axis along the contraction [001] direction of the high-temperature cubic phase. A higher austenitic transformation temperature was found in the single variant comparing with the original multivariant sample. The same order of magnitude for the saturation magnetization M-s, magnetic anisotropy constant k(u), and the twin reorientation stress sigma(tw), namely, 57.6 A m(2)/kg, 1.4x10(5) J/m(3), and approximately 20 MPa, respectively, as those in 5M martensite indicate that it is reasonable to expect a much higher magnetic field-induced-strain in the nonmodulated NiMnGa alloys. (C) 2002 American Institute of Physics.