Metals strengthen with increasing temperature at extreme strain

Index

Abstract

This study investigates the strength of materials at extreme strain rates, exceeding 10⁶ s⁻¹. Using microballistic impact testing, the researchers demonstrate that the strength of copper, titanium, and gold increases with temperature, a counterintuitive finding as most materials soften when heated. This anomalous thermal strengthening is attributed to a shift in the controlling deformation mechanism from thermally activated strengthening to ballistic transport of dislocations.

Publisher

Nature

Published On

Jun 06, 2024

Authors

Ian Dowding, Christopher A. Schuh

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