Materials Transactions, JIM
Online ISSN : 2432-471X
Print ISSN : 0916-1821
ISSN-L : 0916-1821
Ordering, Martensitic and Ferromagnetic Transformations in Ni–Al–Mn Heusler Shape Memory Alloys
Ryosuke KainumaFumihiko GejimaYuji SutouIkuo OhnumaKiyohito Ishida
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2000 Volume 41 Issue 8 Pages 943-949

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Abstract

Order-disorder, martensitic and magnetic transformations in the Ni2AlMn 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 L21 by an ordering reaction causing the Ms temperature to decrease. The Curie temperature which has the highest value of about Tc=92°C at the Ni2AlMn 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.

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