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Rapidly Solidified Ferromagnetic Shape Memory Alloys
|Corneliu M. Craciunescu 1, Horia Chiriac|
1. Politehnica University of Timisoara (UPT), Bd. Mihai Viteazul 1, Timisoara 300222, Romania
Ferromagnetic shape memory alloys have been manufactured by various techniques involving rapid solidification. Bulk alloys have been obtained by extracting the melted alloy in especially designed copper molds; glass coated wires have been obtained by drawing the melt from glass recipients followed by water cooling and ribbons have been fabricated by melt-spinning.
Microstructural observation show particular solidification aspects of fractured areas, while ferromagnetic behavior has been detected in glass coated wires obtained by rapid solidification in composition ranges where such a behavior has not been reported. The martensitic structure has been observed on Co-Ni-Ga rapid solidified bulk alloys and Fe-Pd ribbons.
The memory effect has been detected using a Vibran system that measures the shape recovery capacitively for the ribbons and by visual observation for other specimens. The conclusions of the observations are related to the relationship between the ferromagnetic behavior and the shape memory effect during the transition from nanocrystaline to crystalline state.
Presentation: Poster at E-MRS Fall Meeting 2007, Symposium E, by Corneliu M. Craciunescu
See On-line Journal of E-MRS Fall Meeting 2007
Submitted: 2007-05-15 17:20 Revised: 2009-06-07 00:44