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Microstructure changes in two phaseβ+γ Co-Ni-Al ferromagnetic shape memory alloys in relation to Al/Co ratio

W. Maziarz, J. Dutkiewicz

2008enferromagneticshape memoryalloysmicrostructureCo-Ni-Al

Abstract

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The microstructure of Co 35+x −Ni40−x −Al25 (x = 0, 2.5, 5.0) ferromagnetic shape memory alloys annealed at 1200 ◦C and water quenched has been investigated by optical and analytical transmission electron microscopy. The microstructure consists of elongated grains of martensite and γ phase. Annealing twins were found frequently in the γ phase. The volume fraction of γ phase has been determined to be about 40%. TEM observations show twinned L10 martensite with {111}-type twinning plane and tetragonality c /a=0.85 in all investigated alloys. Determination of the composition of β phase allows to calculate Al/Co and e/a ratio in the range 7.68–8.40 in correlation with its Ms temperatures between 66 and 167 ◦C, respectively. An increase in the Al/Co ratio together with a decrease of Ni content in β phase causes a decrease of the e/a ratio, which promotes a decrease of martensitic transformation temperatures.

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@article{cf2caf5b-d46c-45e8-a575-12535a8e50d8,
  title={Microstructure changes in two phaseβ+γ Co-Ni-Al ferromagnetic shape memory alloys in relation to Al/Co ratio},
  author={W. Maziarz and J. Dutkiewicz},
  year={2008},
  language={en}
}
TY  - JOUR
TI  - Microstructure changes in two phaseβ+γ Co-Ni-Al ferromagnetic shape memory alloys in relation to Al/Co ratio
AU  - W. Maziarz
AU  - J. Dutkiewicz
PY  - 2008
LA  - en
ER  -

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