Study of the dynamical features of the austenite-martensite phase transition in the Ni50(Mn, 1%Fe)34In16 alloy using scanning Hall probe imaging
Study of the dynamical features of the austenite-martensite phase transition in the Ni50(Mn, 1%Fe)34In16 alloy using scanning Hall probe imaging
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DOI：
10.1063/1.3689283
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发表时间：
2012-03
影响因子：
3.2
通讯作者：
M. Chattopadhyay;K. Morrison;A. Dupas;V. Sharma;L. Chandra;L. Cohen;S. Roy
中科院分区：
文献类型：
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作者：
M. Chattopadhyay;K. Morrison;A. Dupas;V. Sharma;L. Chandra;L. Cohen;S. Roy
我们进行了扫描霍尔探针成像实验，以研究马氏体到奥氏体相变在Ni 50（Mn，1%Fe）34 In 16合金作为温度和磁场的函数。我们观察到，马氏体和奥氏体相区分开的一个明显的界面。相变过程中相的相对增长与该界面的运动有关。界面的运动在低温下停止，这导致合金中形成“磁性玻璃”状态。Ni 50（Mn，1%Fe）34 In 16合金的马氏体-奥氏体相变动力学在磁场诱导下与温度诱导下有本质的不同。虽然在冷却期间在合金中的奥氏体到马氏体相变期间观察到马氏体相的成核和生长，但是在升温期间的马氏体到奥氏体相变似乎是生长取向的。相比之下，无论是增加和减少现场实验期间观察到的产品相的形核和生长过程中的场诱导马氏体奥氏体相变。这些不同的意见背后的物理原因进行了探讨。
We have performed scanning Hall probe imaging experiments to study the martensite to austenite phase transition in the Ni50(Mn, 1%Fe)34In16 alloy as a function of temperature and magnetic field. We observe that the martensite and austenite phase regions are separated by a distinct interface. The relative growth of phase across the phase transition is associated with the movement of this interface. The movement of the interface becomes arrested at low temperature, which leads to the formation of a “magnetic glass” state in the alloy. The dynamics of the martensite to austenite phase transition in the Ni50(Mn, 1%Fe)34In16 alloy is found to be qualitatively different when the transition is field induced than what it is when the same transition is induced by temperature. While both nucleation and growth of the martensite phase is observed during the austenite to martensite phase transition in the alloy during cooling down, the martensite to austenite phase transition during warming up appears to be growth oriented. In contrast, both nucleation and growth of the product phases are observed during the field induced martensite to austenite phase transition both during increasing and decreasing field experiments. The physical reasons behind these different observations are explored.