3D printed Mg-NiTi interpenetrating-phase composites with high strength, damping capacity, and energy absorption efficiency

Published on May 1, 2020in Science Advances13.116
· DOI :10.1126/SCIADV.ABA5581
Mingyang Zhang3
Estimated H-index: 3
(USTC: University of Science and Technology of China),
Mingyang Zhang1
Estimated H-index: 1
(USTC: University of Science and Technology of China)
+ 8 AuthorsRobert O. Ritchie132
Estimated H-index: 132
(University of California, Berkeley)
It is of significance, but still remains a key challenge, to simultaneously enhance the strength and damping capacities in metals, as these two properties are often mutually exclusive. Here, we provide a multidesign strategy for defeating such a conflict by developing a Mg-NiTi composite with a bicontinuous interpenetrating-phase architecture through infiltration of magnesium melt into three-dimensionally printed Nitinol scaffold. The composite exhibits a unique combination of mechanical properties with improved strengths at ambient to elevated temperatures, remarkable damage tolerance, good damping capacities at differing amplitudes, and exceptional energy absorption efficiency, which is unprecedented for magnesium materials. The shape and strength after deformation can even be largely recovered by heat treatment. This study offers a new perspective for the structural and biomedical applications of magnesium.
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