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Physics of our days


Unusual plasticity and strength of metals at ultra-short load durations

 a,  b,  c,  a,  a
a Joint Institute for High Temperatures, Russian Academy of Sciences, ul. Izhorskaya 13/19, Moscow, 127412, Russian Federation
b Ben-Gurion University of the Negev, PO Box 653, Beer-Sheva, Negev, 8410501, Israel
c Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow Region, Russian Federation

This paper briefly reviews recent results on the rate-temperature dependence of flow stresses and fracture stresses in metals under high strain rate conditions for pulsed shock-wave loads with durations from tens of picoseconds up to microseconds. In the experiments, an approaching to ultimate ("ideal") values of the shear and tensile strength has been realized and anomalous growth of the yield stress with the temperature at high strain rate has been confirmed for some metals. New evidence is obtained for the intense onset of dislocation multiplication immediately in the elastic precursor wave. It is found that under these conditions inclusions and other strengthening factors may reduce the dynamic yield stress. Novel and unexpected features are observed in the evolution of elastic-plastic shock compression waves.

Fulltext pdf (854 KB)
Fulltext is also available at DOI: 10.3367/UFNe.2016.12.038004
Keywords: shock waves in solids, high-rate deformation, the high-rate fracture, dynamics of dislocations, ideal strength, anomalous thermal hardening, polycrystalline metals and single crystals
PACS: 62.50.−p
DOI: 10.3367/UFNe.2016.12.038004
URL: https://ufn.ru/en/articles/2017/5/c/
000407895100003
2-s2.0-85026903048
2017PhyU...60..490K
Citation: Kanel G I, Zaretsky E B, Razorenov S V, Ashitkov S I, Fortov V E "Unusual plasticity and strength of metals at ultra-short load durations" Phys. Usp. 60 490–508 (2017)
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Received: 11th, October 2016, 8th, December 2016

Оригинал: Канель Г И, Зарецкий Е Б, Разоренов С В, Ашитков С И, Фортов В Е «Необычные пластичность и прочность металлов при ультракоротких длительностях нагрузки» УФН 187 525–545 (2017); DOI: 10.3367/UFNr.2016.12.038004

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