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Strain rate dependence of inelastic strain recovery in ultrafine-grained Al films with different textures

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Abstract

We investigated the tensile load–unload response and inelastic strain recovery in freestanding ultrafine-grained aluminum films with highly dissimilar texture at strain rates ranging from ~ 10–6/s to 10–3/s. For (110) textured bicrystalline films, the flow stress was nearly insensitive to strain rate and inelastic strain recovery both during and after unloading was small, leading to fairly low stress–strain hysteresis. In contrast, there was a substantial increase in flow stress for non-textured films with increasing strain rate. Furthermore, there was significant inelastic strain recovery both during and after unloading, resulting in a large stress–strain hysteresis. Interestingly, while the proportion of inelastic strain recovered during and after unloading varied with strain rate, the total strain recovery remained nearly constant. These observations underscore the influence of crystallographic texture and strain rate on the deformation mechanisms as well as the macroscopic behavior of ultrafine-grained metal films.

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All the experimental data in the manuscript are available upon request from the corresponding author.

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Acknowledgments

This project was funded by the National Science Foundation (NSF) Grant DMR 1454109. The authors would like to gratefully acknowledge the use of facilities at the Eyring Materials Center and ASU Nanofab at Arizona State University.

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  1. Ehsan Izadi and Rohit Berlia have equally contributed to this work.

Authors and Affiliations

  1. Mechanical and Aerospace Engineering, School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, 85287, USA

    Ehsan Izadi, Rohit Berlia & Jagannathan Rajagopalan

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  1. Ehsan Izadi
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  2. Rohit Berlia
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  3. Jagannathan Rajagopalan
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Correspondence to Jagannathan Rajagopalan.

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Izadi, E., Berlia, R. & Rajagopalan, J. Strain rate dependence of inelastic strain recovery in ultrafine-grained Al films with different textures. MRS Advances 6, 489–494 (2021). https://doi.org/10.1557/s43580-021-00100-6

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