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Shape memory effect and related characteristics of helical springs made from Cu–Al–Ni alloy by investment casting

Domenii publicaţii > Fizica + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: S. STANCIU, L.-G. BUJOREANU, N. CIMPOESU, I. IONIÞÃ, V. MOLDOVEANU

Editorial: Inoe, OPTOELECTRONICS AND ADVANCED MATERIALS – RAPID COMMUNICATIONS, Vol. 3, No. 6, June , p.581 - 585, 2009.

Rezumat:

By means of displacement-temperature variation curves, the occurrence of work developing shape memory effect (SME)
was revealed in the case of helical springs made from a Cu-Al-Ni shape memory alloy, obtained by investment casting. The
corresponding critical temperatures of martensitic transformation, determined on springs trained by SME cycling, were
compared to the results obtained by differential scanning calorimetry (DSC) and by dilatometry, on fragments cut from
median coil of SMA springs, both in as-cast and in trained alloy. The microstructure of as-cast SMA springs was analyzed
by scanning electron microscopy (SEM) in order to reveal martensite formation.

Cuvinte cheie: Aliaje Cu-Al-Ni cu memoria formei, Curbe deplasare-temperatura, Turnare in modele pierdute, Temperaturi critice de transformare, Efect de memoria formei // Cu-Al-Ni based shape memory alloys, Displacement-temperature curves, Investment casting, Critical transformation temperatures, Shape memory effect