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 | O C T O B E R 2 0 2 2 3 0 CONSIDERINGSHAPEMEMORY ALLOYS BEYONDNITINOL The first thing that comes to mind when I hear “shape memory alloys” is…Nitinol. Perhaps that is because Nitinol is widely used in different industries, is the first viable shape memory alloy discovered, or simply is what I felt comfortable exploring during my professional upbringing. Of course, I would be seriously remiss if I didn’t acknowledge all the valuable properties Nitinol has to offer. Nonetheless, sometimes I ponder, with so many probable elemental combinations, is it conceivable to concoct the next Nitinol? If you ask me, I think it is entirely possible: a few newfangled elements, a bit of renewed serendipity, some diversity, and we may be looking at a new era of…well, I don’t know what it would be called just yet. But we have a head start: More than 15 other material types where “Ni” and “Ti” are not the protagonists exist, just waiting to be explored. There’s the superlight MgSc-base alloys, the ultra-high temperature PtPd-base ones, and let’s not forget about the original AuCd alloys. On the opposite end of the price tag spectrum are the spaceship-rated CuAl-base alloys, the seismic proof Fe-base versions, and a handful of others that may one day come to fruition. The periodic table is the limit, and I invite you to channel your innovative self and go discover your next Nitinol. Echoing this theme, our first feature article discusses a new shape memory alloy called CCAS, a CoCr-base alloy, which, according to the authors, exhibits a Young’s modulus similar to human bone and superelastic strains double that of Nitinol. How about biocompatibility and wear resistance? Can this alloy have it all? Join me in finding out more from the full article on the following pages. Our second article in this issue tackles the uncertainty in superelastic simulation inputs. Whether designing with Nitinol or other superelastic materials, you may want to know about the credibility of your computational models. Get a glimpse of this framework and see how it could apply to your work. For additional information on Nitinol and other novel alloys, advanced simulations, and much more, visit our newly launched SMST Proceedings website with abstracts and data at https://dl.asminternational.org/shape-memory. Check it out and stay connected with your community. For now, with or without Nitinol, keep the innovation flourishing. Othmane Benafan, FASM, Ph.D. Immediate Past President, International Organization on Shape Memory and Superelastic Technologies GUEST EDITORIAL Benafan 2
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