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One-way  Shape  Memory  Effect  in  a  Cryogenic Treated  Cu-base  Alloy

Iulian Ciupitu 1Dana Daisa 1Elvira Alexandrescu 1Doina Raducanu 2

1. METAV-CD SA, CA Rosetti Nr 31 Sect. 2, Bucharest 70000, Romania
2. University Politehnica of Bucharest, Polizu 1-7, Bucharest, Romania


As it is known, in a binary system Cu-Zn case the Ms  temperature is to down placed so that (therefore) thermo elastic martensitic transformation it is effective non-utile. The additions of Al, Sn, Si, Ge, Be can sensible adjuste the place of Ms point towards moderate temperatures, even positive values. The our experiments was utilised a 21 % zinc  and a 5,4 % aluminium amounts. For comparison, the experimental material was  hot (at  6500C), cold (at 200 C) and  cryogenic processed (at  -700C). Martensitic structures  with various proportion of martensite  were obtained. The literature indicates the getting of SME-termoresponsive martensitic transformation as a result of heat treatments, after plastic deformation. In the usually quenching treatment,  the rapidly cooling of metals most commonly accomplished by immersing the material in oil or water. Within our work, the total thermo elastic martensite transformation was realized by a particular final heat treatment,  which includes  an annealing at 7000C  followed by  cryogenic quenching in a carbonic snow (at  -700C) for few minutes. This procedure, which was inspired by cooling stage of DSC,   induces  one-way shape memory effect  in the experimental alloy.

Keywords: brass with aluminium, shape memory, rolling, thermo elastic martensitic  transformation, cryogenic quenching




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Presentation: Poster at E-MRS Fall Meeting 2008, Symposium C, by Iulian Ciupitu
See On-line Journal of E-MRS Fall Meeting 2008

Submitted: 2008-02-05 14:23
Revised:   2009-06-07 00:48