A D V A N C E D M A T E R I A L S & P R O C E S S E S | M A R C H 2 0 2 3 3 7 1 1 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 frommaterials 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. The first article was taken from our September 2022 issue. The remaining articles were taken from the December 2022 special issue honoring Etienne Patoor for his contributions to the field of phase transforming materials and shape memory alloys. They were selected by Editor-in-Chief Huseyin Sehitoglu. SMJ is available through springerlink.com. For more information, visit asminternational.org/web/smst. September 2022 BUILDING ORIENTATION AND HEAT TREATMENTS’ EFFECT ON THE PSEUDOELASTIC PROPERTIES OF NiTi PRODUCED BY LPBF G. Carlucci, L. Patriarca, A.G. Demir, J.N. Lemke, A. Coda, B. Previtali, and R. Casati NiTi dominates the market of shape memory materials due to its optimal combination of mechanical, functional, and biocompatibility properties, which enabled its use for several applications, in particular for the biomedical and the aerospace sectors. However, due to its poor machinability, NiTi is a challenging material from the manufacturing standpoint. Therefore, in the last years, researchers have focused on the production of NiTi components by additive manufacturing processes, which also enable the manufacturing of complex shape parts that cannot be produced with conventional methods. The aim of this study is to provide insights on the optimization of the functional performances of NiTi produced by laser powder bed fusion, leveraging on the building orientation and post-processing heat treatments. Uniaxial mechanical tests have been performed in tension and compression, and the influence of heat treatments and building orientation on the mechanical behavior of pseudoelastic NiTi has been evaluated. Different heat treatment schedules have been evaluated, leading to transformation strains up to 2.7% in tension and 4.6% in compression. This study confirms that laser powder bed fusion is a promising additive manufacturing technology for the production of net-shape and near defect-free NiTi components, exhibiting remarkable functional properties (Fig. 1). December 2022 DAMPING CAPACITY OF Ti-Nb SHAPE MEMORY ALLOYS EVALUATED THROUGH DMA AND SINGLE-IMPACT TESTS W. Elmay, L. Peltier, X. Gabrion, R. Kubler, B. Piotrowski, P. Laheurte, and S. Berveiller The present work deals with the study of the damping capacity of b-metastable Ti–(24–26) Nb alloys. In this work, several methods have been used to characterize this Fig. 1 — (a) Stress–strain curves of the specimens tested in compression; the labels indicate the heat treatment conditions of each specimen. (b) A schematic illustrating the approximation used for the evaluation of the critical stress to induce the martensitic transformation σPE and the extent of recoverable strain due to the pseudoelastic effect (εPE). (c) Graphical summary of the main results obtained by compression testing of NiTi, in terms of critical stress and the extent of recovered strain both globally and locally. (a) (b) (c)
RkJQdWJsaXNoZXIy MTYyMzk3NQ==