About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Ultrafine-grained and Heterostructured Materials (UFGH XII)
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Presentation Title |
Breaking the Strength-toughness Barrier through Impact-induced Recrystallization of Single-crystal Silver Microcubes |
Author(s) |
Claire Griesbach, Jizhe Cai, Ramathasan Thevamaran |
On-Site Speaker (Planned) |
Claire Griesbach |
Abstract Scope |
As typically mutually exclusive properties, optimizing both strength and toughness requires exploitation of complementary deformation mechanisms provided by different structural heterogeneities. We show that nanostructural changes induced through impact of single-crystal silver microcubes lead to a two-fold improvement in both strength and toughness. Single-crystal silver microcubes are impacted onto a rigid target at ~400 m/s using a laser-induced projectile impact testing (LIPIT) apparatus and undergo extensive recrystallization, forming a gradient-nano-grained (GNG) structure. Stress-strain curves obtained through in situ SEM microcompression testing of pillars FIB-milled from the impacted cubes show ultra-high hardening rates, high yield strengths, and large compressive toughness. The impacted cubes outperform both single-crystal microcubes and bulk polycrystalline silver, boasting superior strength and toughness. The improvement in both properties is attributed to a combination of inter- and intragranular plasticity mechanisms elicited through the spatial gradient of nanograins to coarse grains representative of a GNG structure. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Characterization, Other |