Thermomechanical fatigue of post-weld heat treated NiTi shape memory alloy wires

TitleThermomechanical fatigue of post-weld heat treated NiTi shape memory alloy wires
Publication TypeJournal Article
Year of Publication2016
AuthorsPanton B a, Oliveira JP b, Zeng Z c, Zhou YN a, Khan MI d
JournalInternational Journal of Fatigue
KeywordsHeat treatment, Laser beam welding, Neodymium lasers, NiTi, NiTi shape memory alloys, Post weld heat treatment, Post-weld heat treated, Pulsed lasers, Shape memory effect, Tensile strength, Thermo mechanical fatigues (TMF), Thermomechanical fatigue property, Thermomechanical treatment, Ultimate tensile strength, Welding, Welding and joining, Welds, Wire

Integration of NiTi shape memory alloys (SMAs) into a growing range of applications will rely on the development of welding and joining techniques. Successful adoption of welded NiTi SMA actuators into these applications requires the characterization of the joint fatigue properties. Few investigations have been attempted to characterize the mechanical fatigue properties of NiTi joints, and to the authors’ knowledge there have been no previous investigations on the thermomechanical fatigue properties of these joints. The current work investigated the thermomechanical fatigue properties of Nd:YAG pulsed laser welded, and post-weld heat treated NiTi wires. The welded wires maintained over 86% of the base metal ultimate tensile strength; however, they had reduced actuation stability and stroke, and had significantly reduced cycle life. Use of a post-weld heat treatment successfully increased both the actuation stability and the cycle life by an order of magnitude compared to the welded wires. © 2016 Elsevier Ltd