Low carbon content NiTi shape memory alloy produced by electron beam melting

• Main Authors: Otubo Jorge, Rigo Odair Doná, Moura Neto Carlos de, Kaufman Michael Joseph, Mei Paulo Roberto
• Format: Article
• Language: English
• Published: Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) 2004-01-01
• Series: Materials Research
• Subjects: NiTi; Shape Memory; Electron Beam Melting; Martensitic Transformation
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392004000200008

Earlier works showed that the use of electron beam melting is a viable process to produce NiTi shape memory alloy. In those works a static and a semi-dynamic processes were used producing small shell-shaped and cylindrical ingots respectively. The main characteristics of those samples were low carbon concentration and good composition homogeneity throughout the samples. This paper presents the results of scaling up the ingot size and processing procedure using continuous charge feeding and continuous casting. The composition homogeneity was very good demonstrated by small variation in martensitic transformation temperatures with carbon content around 0.013wt% compared to 0.04 to 0.06wt% of commercial products.