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Study of the transitory formation of α1 bainite, as a precursor of α-

Domenii publicaţii > Stiinte ingineresti + Tipuri publicaţii > Articol în volumul unei conferinţe

Autori: Leandru G. Bujoreanu, Sergiu Stanciu, Paul Bârsãnescu, Nicoleta M. Lohan

Editorial: Paul Schiopu, Cornel Panait, George Caruntu, Adrian Manea, SPIE, Bellingham, WA, 2009, Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies IV, Proceedings of SPIE, Vol. 7297, p.72970B , 2009.

Rezumat:

Bainite transitory formation, during the heating of a martensitic copper base SMA, was predicted by DSC and DTA and
confirmed by XRD, OM and TEM only in hot pressed air cooled state homogenized and tempered at 573 K. In this heat
treatment state, due to the pre-existence of α-phase, bainite amount is expected to be too low, therefore nondistinguishable,
for higher tempering temperatures, where it is suggested that transitory α1 bainite turned to equilibrium
α-phase. The results suggest that bainite formation could be considered as a precursor of α-phase during the heating of
Cu-Zn-Al martensitic alloys, with no pre-existing α.

Cuvinte cheie: Cu-Zn-Al shape memory alloys, martensite, α1 - bainite, α- phase, transitory phenomena