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Influence of processing route on microstructure and grain boundary development during equal-channel angular pressing of pure aluminum

McNelley, T.R., Swisher, D.L., Horita, Z. and Langdon, T.G. (2002) Influence of processing route on microstructure and grain boundary development during equal-channel angular pressing of pure aluminum In, Zhu, Y.T., Langdon, T.G., Mishra, R.S., Semitian, S.L., Saran, M.J. and Lowe, T.C. (eds.) Ultrafine grained materials II. 2002 TMS Annual Meeting and Exhibition Minerals, Metals & Materials Society pp. 15-24.

Record type: Book Section


High-purity (99.99%) aluminum that had been subjected to equal-channel angular pressing (ECAP) was analyzed by orientation imaging microscopy (OIM). The analysis of microtexture and microstructure by OIM will be reviewed. The ECAP pressing was conducted at room temperature with a die that had a 90° angle between the die channels and repetitive pressings followed either route A, BC or C. Billets were examined after one pass and after four or twelve passes by each of the ECAP routes. After one pressing operation, the deformation-induced microstructure was inhomogeneous at the resolution of OIM and consisted mostly of subgrains. Following four pressings by each of the routes, the microstructures were homogeneous and exhibited similar (sub)grain sizes (~1.3?m). Elongation and alignment of the (sub)grains with the shearing direction of the last pressing operation was observed in all cases. The corresponding disorientation distributions showed significant increases in the fractions of high-angle boundaries (?>15°) although processing route had little apparent effect on the observed distributions. However, distinct differences were noted in the microtexture data. After 12 pressing operations by any of the different routes the grain size was reduced further to about 1.0?m. The fraction of high-angle boundaries also increased slightly but, again, processing route had little effect on the disorientation distribution. Different textures were apparent for each processing route, although texture data for all routes indicated that a <111> tended to align with the shear plane of the final pressing pass

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Published date: 2002
Venue - Dates: 2002 TMS Annual Meeting and Exhibition, 2002-02-17 - 2002-02-21
Keywords: equal-channel angular pressing, grain boundaries, microtexture, homogeneity


Local EPrints ID: 23865
ISBN: 0-87339-523-9
PURE UUID: e372981a-b8b8-4d88-beaa-b14f4af8035f
ORCID for T.G. Langdon: ORCID iD

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Date deposited: 05 Apr 2006
Last modified: 17 Jul 2017 16:16

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Author: T.R. McNelley
Author: D.L. Swisher
Author: Z. Horita
Author: T.G. Langdon ORCID iD
Editor: Y.T. Zhu
Editor: T.G. Langdon
Editor: R.S. Mishra
Editor: S.L. Semitian
Editor: M.J. Saran
Editor: T.C. Lowe

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