TY - JOUR
T1 - The evolution of homogeneity and grain refinement during equal-channel angular pressing
T2 - A model for grain refinement in ECAP
AU - Xu, Cheng
AU - Furukawa, Minoru
AU - Horita, Zenji
AU - Langdon, Terence G.
N1 - Funding Information:
This work was supported in part by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science, Sports and Culture of Japan, in part by the Light Metals Educational Foundation of Japan and in part by the National Science Foundation of the United States under Grant no. DMR-0243331.
PY - 2005/5/25
Y1 - 2005/5/25
N2 - 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.
AB - 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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U2 - 10.1016/j.msea.2005.03.083
DO - 10.1016/j.msea.2005.03.083
M3 - Article
AN - SCOPUS:18844391032
SN - 0921-5093
VL - 398
SP - 66
EP - 76
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
IS - 1-2
ER -