Towards direct metal laser fabrication of Cu-based shape memory alloys

Abstract

Purpose – The purpose of this paper is to explore the possibility of producing Cu-based shape memory alloys (SMA) by means of direct metal laserfabrication (DMLF).Design/methodology/approach – The fabrication approach consists of the combination of laser melting of a metallic powder with heatingtreatment in a controlled inert atmosphere. Three prospective Cu-Al-Ni alloy compositions were tested, and the effects of laser power, as well aslaser exposure time, were verified.Findings – All the processed materials were found to attain microstructures and phase change transformation temperatures typical of this type ofSMA.Practical implications – Further development of this technique will allow for fabrication of large elements with considerable shape memory effect,which are currently not viable due to high cost of nitinol.Originality/value – This work showed a proof of concept toward the development of DMLF-based additive manufacturing of near net shapecomponents of Cu-based SMAs from elemental powders.