Metallurgy

Refining shape memory

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Science  01 Mar 2019:
Vol. 363, Issue 6430, pp. 942-943
DOI: 10.1126/science.363.6430.942-d

Shape-memory alloys such as nickel-titanium (NiTi) are important for biomedical applications like heart stents because they can recover their original shape after a large deformation. However, understanding this behavior is limited owing to the lack of good three-dimensional (3D) methods for characterizing the microstructures. Bucsek et al. show in three recent papers how different types of 3D x-ray–based techniques help track and understand microstructures in NiTi alloys. The techniques allow better modeling of twinning behavior, phase transformations, and grain boundaries, as well as the effects of precipitates and inclusions. The experiments will help clarify micromechanical models and determine the most important aspects of using and developing new shape-memory alloys.

J. Mech. Phys. Solids 124, 897 (2019); Acta Cryst. A74, 425 (2018); Scr. Mater. 162, 361 (2019).

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