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Effect of Equal Channel Angular Pressing on Lamellar Microstructures in Nickel Aluminum Bronze

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Abstract

A lamellar nickel aluminum bronze has been processed by equal channel angular pressing (ECAP) and its microstructure investigated. The orientation, spacing, and morphology of the lamellae after ECAP were observed to be dependent on the orientation of the lamellae before ECAP with respect to the shear plane. Two distinct microstructures were produced following a single ECAP pass. The most common type consisted of fragmented lamellae with a reduced lamellar spacing, inclined between >0 deg and <45 deg to the exit channel, and the second type comprised bent lamellae with an increased spacing and were inclined between >45 deg and <180 deg, with exceptions at 0/180 deg and 45 deg. A model describing the evolution of lamellar microstructures subjected to a single ECAP pass has been proposed.

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Acknowledgments

This project is supported by the Defence Materials Technology Centre (DMTC). The authors thank the Monash Centre for Electron Microscopy (MCEM) for the assistance with EBSD analysis.

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Correspondence to Daniel T. McDonald.

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Manuscript submitted August 20, 2012.

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McDonald, D.T., Barr, C.J. & Xia, K. Effect of Equal Channel Angular Pressing on Lamellar Microstructures in Nickel Aluminum Bronze. Metall Mater Trans A 44, 5556–5566 (2013). https://doi.org/10.1007/s11661-013-1888-3

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  • DOI: https://doi.org/10.1007/s11661-013-1888-3

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