Ordering, martensitic and ferromagnetic transformations in Ni-Al-Mn heusler shape memory alloys

Ryosuke Kainuma, Fumihiko Gejima, Yuji Sutou, Ikuo Ohnuma, Kiyohito Ishida

Research output: Contribution to journalArticlepeer-review

84 Citations (Scopus)

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 alloys.

Original languageEnglish
Pages (from-to)943-949
Number of pages7
JournalMaterials Transactions, JIM
Volume41
Issue number8
DOIs
Publication statusPublished - 2000

ASJC Scopus subject areas

  • Engineering(all)

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