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Deformation mechanics and microstructure evolution during indirect extrusion in (sub) mm-scale samples

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Abstract

Mechanics of deformation in miniaturized indirect extrusion (IE) and their resulting process outcomes are shown to be dependent on the dimensional scale of the plastic deformation zone. Using optically transparent dies as prototypes, the effect of process length-scales on the strain, strain-rate, and rotation fields is elucidated using digital image correlation. In this regard, in situ experiments were performed on commercially pure Lead (Pb) and Aluminum (Al 1100) as prototypical nonwork/work hardening materials. By overlaying these measurements with microstructural characterization via electron backscattered diffraction, the effect of deformation volume on process–structure mappings is identified. Herein, visco-plastic self-consistent framework-based modeling of the evolution of crystallographic textures was investigated to achieve insights into the trajectories of microstructure evolution and process outcomes during IE. These findings provide a beneficial background about characteristics of plastic deformation zone and its distribution to optimize and control the properties of miniaturized components.

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ACKNOWLEDGMENTS

Support from the National Science Foundation (CMMI Grant No. 1030265) and the II–VI foundation block gift program is acknowledged. We are also grateful for the comments of the reviewer, which helped significantly improve the manuscript.

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Authors and Affiliations

  1. Department of Industrial Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania, 15213, USA

    Marzyeh Moradi & M. Ravi Shankar

  2. Department of Mechanical Engineering, George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia, 30313, USA

    Saurabh Basu

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  1. Marzyeh Moradi
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  2. Saurabh Basu
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  3. M. Ravi Shankar
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Correspondence to M. Ravi Shankar.

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Moradi, M., Basu, S. & Shankar, M.R. Deformation mechanics and microstructure evolution during indirect extrusion in (sub) mm-scale samples. Journal of Materials Research 31, 1096–1112 (2016). https://doi.org/10.1557/jmr.2016.85

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