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説明:

In this work, we combine two powerful small-scale testing methods, custom nanoindentation, and laser-driven microflyer (LDMF) shock, to measure the dynamic and spall strength of metals. The nanoindentation system is configured to test samples from quasistatic to dynamic strain-rate regimes. The LDMF shock system can test samples through impact loading, triggering spall failure. The model material used for testing is magnesium alloys, which are lightweight, possess high-specific strengths, and have historically been challenging to design and strengthen due to their mechanical anisotropy. We adopt two distinct microstructures, solutionized (no precipitates) and peak-aged (with precipitates) to demonstrate interesting upticks in strain-rate sensitivity and evolution of dynamic strength. At high shock-loading rates, we unravel an interesting paradigm where the spall strength vs. strain rate of these materials converges, but the failure mechanisms are markedly different. Peak aging, considered to be a standard method to strengthen metallic alloys, causes catastrophic failure, faring much worse than solutionized alloys.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

  This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

キーワード: magnesium alloy, high-throughput, strain rate, dynamic behavior

刊行年月日: 2024-04-30

出版者: Oxford University Press (OUP)

掲載誌:

• PNAS Nexus (ISSN: 27526542) vol. 3 issue. 5 pgae148

研究助成金:

• Army Research Laboratory W911NF-12-2-0022 and W911NF-22-2-0014
• National Nuclear Security Administration DE-NA0003857

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1093/pnasnexus/pgae148

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更新時刻: 2024-11-19 16:31:12 +0900

MDRでの公開時刻: 2024-11-19 16:31:12 +0900