Engineering and Technology

Metals strengthen with increasing temperature at extreme strain rates

I. Dowding and C. A. Schuh

This groundbreaking research conducted by Ian Dowding and Christopher A. Schuh delves into the unusual behavior of materials such as copper, titanium, and gold at extreme strain rates, revealing that these metals actually strengthen with increased temperature, defying conventional expectations.

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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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