Microstructural evolution in shear-punch tests: A comparative study of pure Cu and Cu-Cr alloy

Escobar, Julian D.; Silverstein, Joshua A.; Ishrak, Farhan; Li, Lei; Soulami, Ayoub; Li, Shuang; Yu, Anqi; Mathaudhu, Suveen N.; Ortiz, Angel; Koch, Carl; Devaraj, Arun; Efe, Mert; Gwalani, Bharat

doi:10.1016/j.msea.2023.145715

Title: Microstructural evolution in shear-punch tests: A comparative study of pure Cu and Cu-Cr alloy

Journal Article · 15 September 2023 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI: https://doi.org/10.1016/j.msea.2023.145715 · OSTI ID:2332942

Escobar, Julian D. ^[1]; Silverstein, Joshua A. ^[1]; Ishrak, Farhan ^[2];

^[1];

^[1]; Li, Shuang ^[1]; Yu, Anqi ^[1]; Mathaudhu, Suveen N. ^[3]; Ortiz, Angel ^[1]; Koch, Carl ^[2];

^[1]; Efe, Mert ^[1]; Gwalani, Bharat ^[2]

Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
North Carolina State University, Raleigh, NC (United States)
Colorado School of Mines, Golden, CO (United States)

Understanding the mechanisms behind microstructural evolution during shear deformation has been a long-standing area of interest. However, establishing a connection between microstructure, mechanical properties, and extent of shear deformation is challenging and requires refined experimental approaches. Shear-punch testing (SPT) provides a controlled method to introduce shear into small volumes of material that later can be subjected to detailed microstructural characterization. In this study, we utilize an SPT device to induce shear deformation to pure copper and a binary copper-chromium alloy. Electron backscatter diffraction and transmission electron microscopy were used to study the mechanisms of plastic deformation after SPT. Our results indicate that shear deformation of pure Cu produces a dense network of intercepting microshear bands upon sustained deformation. Twin boundaries undergo degradation into high angle grain boundaries due to simultaneous deviation from the axis-angle pair condition of 60° misorientation on [111] direction. The presence of 50% volume Cr particles in the soft Cu matrix fundamentally altered the shear deformation mechanism. Preferential deformation of the Cu matrix led to accelerated shear-induced formation of low and high angle grain boundaries, and subsequent grain refinement. Comparatively, no grain refinement occurred in pure Cu at a strain ~10 times larger (ϵ = 4.73) than that of the copper-chromium case (ϵ = 0.42). Overall, our study sheds light on the microstructural evolution during shear deformation and highlights the significant influence of particle reinforcements on the shear deformation mechanisms of metals.

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

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 2332942

Report Number(s):: PNNL-SA-189843

Journal Information:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Journal Name: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing Vol. 886; ISSN 0921-5093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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