Welding and Joining of NiTi Shape Memory Alloys: A Review. (July 2017)

• Record Type: Journal Article
• Authors: Oliveira, J.P.; Miranda, R.M.; Braz Fernandes, F.M.
• Is Part Of: Progress in materials science. Volume 88(2017)
• Page Start: 412
• Page End: 466
• Publication Date: 2017-07
• Subjects: A austenite -- BM base material -- EDS energy dispersive spectroscopy -- FIB focused ion beam -- FSW friction stir welding -- FZ fusion zone -- GTAW gas tungsten arc welding -- HAZ heat affected zone -- HI heat input -- M martensite -- MIG metal inert gas -- MAG metal active gas -- MRW micro-resistance welding -- Nd:YAG neodymium-doped yttrium aluminium garnet -- R crystal growth rate -- T temperature gradient -- SEM scanning electron microscopy -- SMAs shape memory alloys -- TEM transmission electron microscopy -- TIG tungsten inert gas -- UTS ultimate tensile strength; NiTi shape memory alloys -- Welding -- Joining -- Dissimilar joints -- Superelasticity -- Shape memory effect; Materials science -- Periodicals; Science des matériaux -- Périodiques; 620.1105
• DOI: 10.1016/j.pmatsci.2017.04.008
• Languages: English
• ISSNs: 0079-6425

Abstract

Abstract: NiTi is an increasingly applied material in industrial applications. However, the difficulties faced when welding and joining is required, limits its broader use in the production of complex shaped components. The main weldability problems associated with NiTi are: strength reduction, formation of intermetallic compounds, modification of phase transformation and transformation temperatures, as well as, changes in both superelastic and shape memory effects. Additionally, NiTi is envisaged to be joined to other materials, in dissimilar joints with more complex problems depending on the other base material. Thus, intensive research in welding and its effects on the joints performance has been conducted since the early stages of NiTi. This paper presents a detailed review of welding and joining processes applied to NiTi, in similar and dissimilar combinations considering both fusion and solid-state processes. Since laser is the most studied and applied welding process, a special section is devoted to this technique.