Grain structure evolution during cryogenic rolling of alpha brass

Konkova, T. and Mironov, S. and Korznikov, A. and Korznikova, G. and Myshlyaev, M.M. and Semiatin, S.L. (2015) Grain structure evolution during cryogenic rolling of alpha brass. Journal of Alloys and Compounds, 629. pp. 140-147. ISSN 0925-8388 (https://doi.org/10.1016/j.jallcom.2014.12.241)

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Abstract

High-resolution electron backscatter diffraction (EBSD) was used to study grain structure development during cryogenic rolling of Cu-29.5Zn brass. Microstructure evolution was found to be broadly similar to that occurring during rolling at room temperature. Specifically, favorably-oriented grains (Copper {1 1 2} 〈1 1 1〉 and S {1 2 3}〈6 3 4〉) experienced profuse deformation twinning followed by extensive shear banding. This eventually produced an ultrafine structure with a mean grain size of ∼0.2 μm. On the other hand, grains with crystallographic orientations close to Brass {1 1 0}〈1 1 2〉 and Goss {1 1 0}〈1 0 0〈 were found to be stable against twinning/shear banding and thus showed no significant grain refinement. As a result, the final structure developed in heavily-rolled material was distinctly inhomogeneous consisting of mm-scale remnants of original grains with poorly developed substructure and ultra-fine grain domains.

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