Crystal microstructures inspire architected 3D printed metamaterials

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different from those of the matrix. Face-centered (fcc) “meta precipitates,” for example, were introduced into body-centered (bcc) lattices. Not only did the overall strength and stability go up, but the shear bands were found to bow or stop around the meta precipitate interface. Finally, nonidentical lattice architectures were stacked on top of each other to generate multiscale hierarchical structures such as alternating fcc–bcc structures. The interfaces between the metaphases formed incoherent boundaries non-traversable to slip while combining the benefits of precipitation hardening. These mesostructures show that by tailoring architechted materials, lightweight components that can better withstand external loads can be designed. María Teresa Pérez-Prado, head of the Physical Metallurgy Group at IMDEA Materials Institute, Spain, told MRS Bulletin that “this is one of the most creative recent works related to metallurgical research, which opens up new avenues to engineer lattice structures (metamaterials) with unprecedented properties.” She added that the “authors demonstrate a very strong resemblance between the behavior of architected lattices and metals, which is very striking. In particular, the parallelism shown in the paper between shear band propagation in lattices and slip bands in metals, as well as between the strengthening via a reduction in the size of meta-grains and the well-known Hall– Petch behavior are very surprising.” Christian Leinenbach, head of Alloy Design for Advanced Processing Technologies at Empa—Swiss Federal Laboratories for Materials Science and Technology, echoed Pérez-Prado’s sentiments. “This approach opens up new space of controlling the properties of 3D printed products and offers a new way to make hierarchically structured parts with exceptional properties, e.g., lightweight and high damage tolerance. It seems to be possible to apply the idea to a variety of different materials or even combine materials to create novel architected ‘meta-composites.’ ” Both Pérez-Prado and Leinenbach are unrelated to the work reported in the publication. Vineet Venugopal

• VOLUME • www.mrs.org/bulletin BULLETIN 44 • of APRIL Downloaded from https://www.cambridge.org/core. IP address: 146.185.200.230, on 12 Apr 2019 at 19:05:40, subjectMRS to the Cambridge Core terms use,2019 available at https://www.cambridge.org/core/terms. https://doi.org/10.1557/mrs.2019.79

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