ADVANCED MATERIALS & PROCESSES | OCTOBER 2025 50 Shape Memory and Superelasticity: Advances in Science and Technology (SMJ) is the official journal of the International Organiza- tion 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 SMJ HIGHLIGHTS 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. The featured article below was taken from the June 2025 issue. It was part of a special issue focus honoring Shape Memory Associate Editor Petr Šittner on his 65th birthday. It was selected by Shape Memory Editor-in-Chief Huseyin Sehitoglu. SMJ is available through link.springer.com. For more information, visit asminternational.org/smst. June 2025 ELASTIC CONSTANTS OF SINGLE-CRYSTALLINE NiTi STUDIED BY RESONANT ULTRASOUND SPECTROSCOPY Lucie Bodnárová, Michaela Janovská, Martin Ševčík, Miroslav Frost, Lukáš Kadeřávek, Jaromír Kopeček, Hanuš Seiner, and Petr Sedlák Contactless, laser-based resonant ultrasound spectro- scopy was utilized to monitor changes in elastic properties in single-crystalline NiTi shape memory alloy. It was observed that the elastic behavior of the temperature- induced B19′ martensite, which is formed by a fine mixture of variants, adopts the symmetry elements of the parent austenite phase and thus, the changes over the transfor- mation temperature can be represented by the temperature evolution of three cubic elastic coefficients. The experiments confirm that the transition during the cooling run is preceded by pronounced softening of the c44 elastic coefficient, which leads to nearly complete vanishing of elastic aniso- tropy prior to the transition. Below the transition, this coefficient remains soft, and the character of anisotropy switches from c44/c′ > 1 to c44/c′ < 1. We rationalize this behavior from the mechanical instability of the B19′ lattice with respect to shears along the (001)B19′ plane, which is known from first-principles calculations (Fig. 1). Fig. 1 — Optical microscope images of the sample at three temperatures during heating of the sample (a). Image Quality (IQ) snapshot by EBSD method (b) of Ti2Ni precipitates (dark gray) and TiC inclusions (black) within NiTi matrix (light gray). SMJ CELEBRATES MILESTONE Shape Memory and Superelasticity is celebrating its 10th anniversary in 2025. To commemorate this momentous achievement, Editor-in-Chief Huseyin Sehitoglu published an editorial for the September issue of the journal. You can read it here: https://link.springer.com/article/10.1007/ s40830-025-00571-8. A collection of Editor’s Choice articles from the last 10 years can also be found here: https://link. springer.com/journal/40830/updates/17312314. They are free access and available to read. Congratulations to the editorial team of Shape Memory and Superelasticity. We look forward to the next 10 years! 14
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