ADVANCED MATERIALS & PROCESSES | APRIL 2024 57 SMJ HIGHLIGHTS Shape Memory and Superelasticity: Advances in Science and Technology (SMJ) is the official journal of the International Organization on Shape Memory and Superelastic Technologies (SMST), an affiliate society of ASM International. The journal publishes original peer-reviewed papers that focus on shape memory materials research with contributions from materials science, experimental and theoretical mechanics, physics with cognizance of the chemistry, underlying phases, and crystallography. It also provides a forum for researchers, scientists, and engineers of varied disciplines to access information about shape memory materials. Both articles were taken from our September 2023 issue. They were selected by Shape Memory Editor-in-Chief Huseyin Sehitoglu. SMJ is available through springerlink. com. For more information, visit asminternational.org/smst. September 2023 SINTER-BASED ADDITIVE MANUFACTURING OF Ni——Ti SHAPE MEMORY ALLOY Yeshurun Cohen, Carlo Burkhardt, Lucas Vogel, Andreas Baum, Gerald Mitteramskogler, Doron Shilo, and Eilon Faran Abstract additive manufacturing (AM) of shape memory alloys (SMA) is an emerging technology that can open the route for numerous new applications in the fields of actuation, sensing, energy harvesting, and heat management. Currently, most AM processes of SMA rely on liquid-state methods that locally melt the metallic feedstock. Recent advances in sinter-based AM have the potential to facilitate the control over the final microstructure and properties of 1 1 Fig. 1 — Schematic representation of the LMM system by Incus GmbH. The slurry feedstock is spread upon the building platform using the coating blade, and the DLP projector exposes certain areas to the light, allowing the photopolymers to solidify and the slurry in those areas to become part of the green part. the printed SMA. This article presents the production and characterization of Ni–Ti SMA using sinter-based lithography-based metal manufacturing (LMM). The authors report a recoverable strain of up to 2.3% under compression, while the amount of irrecoverable plastic strain is smaller than 0.05% up to a stress of 800 MPa. The high strength with moderate recoverable strain is attributed to the carbon content that promotes the formation of Ti-carbides during high temperature sintering. We analyze the origin and role of the carbides in the thermo-mechanical response of the AM Ni–Ti and argue that this strengthening mechanism calls for further studies and can be beneficial for certain applications. The results indicate that LMM is a feasible and promising method to produce net-shaped SMA and encourage future studies of other sinter-based AM processes (Fig. 1).
RkJQdWJsaXNoZXIy MTYyMzk3NQ==