Journal
ZEITSCHRIFT FUR METALLKUNDE
Volume 96, Issue 8, Pages 843-846Publisher
CARL HANSER VERLAG
DOI: 10.3139/146.101110
Keywords
NiMnGa Heusler alloy; high temperature shape-memory effect; ductility; martensitic transformation
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Buttons of high-temperature shape-memory alloy Ni56Mn25-xFexGa19 were prepared by arc melting under argon atmosphere. The specimens were hot rolled to 1 mm. plates, and their martensitic transformation behaviors, ductilities, and shape-memory effects were investigated through differential scanning calorimetry and bending tests. It was found that the brittleness of polycrystalline Ni2MnGa was ameliorated through introduction of a ductile phase by Fe addition. Ni56Mn17Fe8Ga19 alloy shows great potential as a practical high-temperature shape-memory alloy with martensitc transformation start temperature above 200 degrees C. It can bear strain of 6 % before fracture in bending tests and shows a maximum reversible strain of 3.5 %.
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