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

Abstract

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.

Authors:
ORCiD logo; ; ; ORCiD logo; ; ORCiD logo; ; ; ; ; ; ORCiD logo
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE Office of Nuclear Energy (NE); National Science Foundation (NSF)
OSTI Identifier:
1712547
Alternate Identifier(s):
OSTI ID: 1734746
Report Number(s):
PNNL-SA-153669
Journal ID: ISSN 2662-4443; 85; PII: 87
Grant/Contract Number:  
AC05-76RL01830; NE0008739; 1726897
Resource Type:
Published Article
Journal Name:
Communications Materials
Additional Journal Information:
Journal Name: Communications Materials Journal Volume: 1 Journal Issue: 1; Journal ID: ISSN 2662-4443
Publisher:
Nature Publishing Group
Country of Publication:
Country unknown/Code not available
Language:
English
Subject:
36 MATERIALS SCIENCE; Solid-Phase Processing; Shear Deformation; Al–Si Alloys; Nanostructure; Metastable

Citation Formats

Gwalani, Bharat, Olszta, Matthew, Varma, Soumya, Li, Lei, Soulami, Ayoub, Kautz, Elizabeth, Pathak, Siddhartha, Rohatgi, Aashish, Sushko, Peter V., Mathaudhu, Suveen, Powell, Cynthia A., and Devaraj, Arun. Extreme shear-deformation-induced modification of defect structures and hierarchical microstructure in an Al–Si alloy. Country unknown/Code not available: N. p., 2020. Web. https://doi.org/10.1038/s43246-020-00087-x.
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. Extreme shear-deformation-induced modification of defect structures and hierarchical microstructure in an Al–Si alloy. Country unknown/Code not available. https://doi.org/10.1038/s43246-020-00087-x
Gwalani, Bharat, Olszta, Matthew, Varma, Soumya, Li, Lei, Soulami, Ayoub, Kautz, Elizabeth, Pathak, Siddhartha, Rohatgi, Aashish, Sushko, Peter V., Mathaudhu, Suveen, Powell, Cynthia A., and Devaraj, Arun. Thu . "Extreme shear-deformation-induced modification of defect structures and hierarchical microstructure in an Al–Si alloy". Country unknown/Code not available. https://doi.org/10.1038/s43246-020-00087-x.
@article{osti_1712547,
title = {Extreme shear-deformation-induced modification of defect structures and hierarchical microstructure in an Al–Si alloy},
author = {Gwalani, Bharat and Olszta, Matthew and Varma, Soumya and Li, Lei and Soulami, Ayoub and Kautz, Elizabeth and Pathak, Siddhartha and Rohatgi, Aashish and Sushko, Peter V. and Mathaudhu, Suveen and Powell, Cynthia A. and Devaraj, Arun},
abstractNote = {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.},
doi = {10.1038/s43246-020-00087-x},
journal = {Communications Materials},
number = 1,
volume = 1,
place = {Country unknown/Code not available},
year = {2020},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1038/s43246-020-00087-x

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