Ordering, Martensitic and Ferromagnetic Transformations in Ni–Al–Mn Heusler Shape Memory Alloys
Ordering, Martensitic and Ferromagnetic Transformations in Ni–Al–Mn Heusler Shape Memory Alloys
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DOI：
10.2320/matertrans1989.41.943
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发表时间：
2000-08
影响因子：
1.2
通讯作者：
R. Kainuma;F. Gejima;Y. Sutou;I. Ohnuma;K. Ishida
中科院分区：
文献类型：
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作者：
R. Kainuma;F. Gejima;Y. Sutou;I. Ohnuma;K. Ishida
用差示扫描量热仪（DSC）、X射线衍射仪（XRD）和透射电子显微镜（TEM）研究了Ni 2AlMn合金的有序-无序相变、马氏体相变和磁相变。确定了上述转变的临界温度。结果表明，在低温时效时，通过有序化反应，母相结构从B2转变为L2 1，导致Ms温度降低。居里温度在Ni 2AlMn组份下具有约Tc = 92°C的最高值，当偏离化学计量组成时，居里温度急剧下降。在时效态Ni-21 Al-25 Mn和Ni-22 Al-25 Mn合金中还发现了两种新的马氏体相。
Order-disorder, martensitic and magnetic transformations in the Ni 2 AlMn alloys have been investigated by differential scanning calorimetry (DSC), X-ray diffraction (XRD) and transmission electron microscopy (TEM) techniques. The critical temperatures corresponding to the above transformations have been determined. It is shown that, on aging at low temperature, the parent phase structure changes from that of B2 to L2 1 by an ordering reaction causing the Ms temperature to decrease. The Curie temperature which has the highest value of about T c = 92°C at the Ni 2 AlMn composition decreases steeply on deviating from the stoichiometric composition. Two kinds of new martensite phases have also been detected in the as-aged Ni-21Al-25Mn and Ni-22Al-25Mn alloys.