The evolution of homogeneity and grain refinement during equal-channel angular pressing: a model for grain refinement in ECAP

Xu, Cheng, Furukawa, Minoru, Horita, Zenji and Langdon, Terence G. (2005) The evolution of homogeneity and grain refinement during equal-channel angular pressing: a model for grain refinement in ECAP. Materials Science and Engineering: A, 398 (1-2), 66-76. (doi:10.1016/j.msea.2005.03.083).

Abstract

Samples of pure aluminum and an Al-6061 alloy were subjected to equal-channel angular pressing (ECAP) for up to eight passes at room temperature. The Vickers microhardness was recorded on the polished cross-sections of each as-pressed billet and the results are plotted in the form of color-coded maps to provide a pictorial depiction of the hardness distributions throughout the cross-sections. The results show the hardness increases by a factor of ~2 in the first pass through the die but thereafter there is only a minor increase. The microhardness distribution is homogeneous in the unpressed condition but becomes inhomogeneous after a single pass and then reasonably homogeneous in subsequent passes. The results reveal some differences between the behavior of pure Al and the Al-6061 alloy. These results and microscopic observations are used to develop a model for the process of grain refinement during ECAP.

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Contributors

Author: Terence G. Langdon

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