Extreme shear-deformation-induced modification of defect structures and hierarchical microstructure in an Al–Si alloy

Gwalani, Bharat; Olszta, Matthew; Varma, Soumya; Li, Lei; Soulami, Ayoub; Kautz, Elizabeth; Pathak, Siddhartha; Rohatgi, Aashish; Sushko, Peter V.; Mathaudhu, Suveen; Powell, Cynthia A.; Devaraj, Arun

doi:10.1038/s43246-020-00087-x

Title: Extreme shear-deformation-induced modification of defect structures and hierarchical microstructure in an Al–Si alloy

Journal Article · 11 November 2020 · Communications Materials

DOI: https://doi.org/10.1038/s43246-020-00087-x · OSTI ID:1712547

; Olszta, Matthew; Varma, Soumya;

; Soulami, Ayoub;

; Pathak, Siddhartha; Rohatgi, Aashish; Sushko, Peter V.; Mathaudhu, Suveen; Powell, Cynthia A.;

Abstract Extreme shear deformation is used for several material processing methods and is unavoidable in many engineering applications in which two surfaces are in relative motion against each other while in physical contact. The mechanistic understanding of the microstructural evolution of multi-phase metallic alloys under extreme shear deformation is still in its infancy. Here, we highlight the influence of shear deformation on the microstructural hierarchy and mechanical properties of a binary as-cast Al-4 at.% Si alloy. Shear-deformation-induced grain refinement, multiscale fragmentation of the eutectic Si-lamellae, and metastable solute saturated phases with distinctive defect structures led to a two-fold increase in the flow stresses determined by micropillar compression testing. These results highlight that shear deformation can achieve non-equilibrium microstructures with enhanced mechanical properties in Al–Si alloys. The experimental and computational insights obtained here are especially crucial for developing predictive models for microstructural evolution of metals under extreme shear deformation.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Nuclear Energy (NE); USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC05-76RL01830; NE0008739

OSTI ID:: 1712547

Report Number(s):: PNNL-SA-153669; 85; PII: 87

Journal Information:: Communications Materials, Journal Name: Communications Materials Journal Issue: 1 Vol. 1; ISSN 2662-4443

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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36 MATERIALS SCIENCE
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Title: Extreme shear-deformation-induced modification of defect structures and hierarchical microstructure in an Al–Si alloy

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