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Influence of Heat Treatments on a NiTi Shape Memory Alloy Obtained Using Vacuum Induction Melting and Reprocessed by Plasma Skull Push-Pull

Published online by Cambridge University Press:  01 October 2015

Jackson de Brito Simões ,
Francisco Fernando Roberto Pereira ,
Jorge Otubo  and
Carlos José de Araújo
Jackson de Brito Simões
Affiliation:
Universidade Federal de Campina Grande (UFCG), Campina Grande - PB, Brazil. Universidade Federal Rural do Semi-Arido (UFERSA), Caraúbas – RN, Brazil.
Francisco Fernando Roberto Pereira
Affiliation:
Universidade Federal de Campina Grande (UFCG), Campina Grande - PB, Brazil. University of Cambridge, Cambridge, United Kingdom.
Jorge Otubo
Affiliation:
Instituto Tecnológico de Aeronáutica (ITA), São José dos Campos – SP, Brazil.
Carlos José de Araújo
Affiliation:
Universidade Federal de Campina Grande (UFCG), Campina Grande - PB, Brazil.
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Abstract

Shape memory alloys (SMA) are metallic attractive engineering materials due to their capacity to store pre-defined shapes through a thermally induced phase transition from a solid state. This paper aims to evaluate the influence of solubilization thermal treatments on a NiTi shape memory alloy originally fabricated by vacuum induction melting and then reprocessed by plasma melting followed by injection molding (Plasma Skull Push Pull process) into different metal molds (steel, aluminum, brass and copper) in order to compare the thermal properties regarding to its raw state. The thermal treatments of solubilization were carried out at 850°C in different times (2n function, n = 0, 1, 2 and 3, in hours). The influence of solubilizing treatments in the NiTi shape memory alloy was analyzed using the following characterization techniques: Differential Scanning Calorimetry (DSC) and Electrical Resistance as a function of Temperature (ERT). The results demonstrate that the solubilization heat treatments applied on the reprocessed NiTi shape memory alloy through the plasma skull push pull process, provides important changes in the phase transformation of the material. Therefore, it was demonstrated that it is necessary to solubilize the material after melting or remelting the NiTi shape memory alloy via this process to obtain mini-actuators products with homogeneous properties.

Keywords

memoryalloyphase transformation
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1765: Symposium 4A – Advanced Structural Materials—2014 , 2015 , pp. 121 - 126
Copyright
Copyright © Materials Research Society 2015 

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References

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