Influence of pressing speed on microstructural development in equal-channel angular pressing |
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| Authors: | Patrick B Berbon Minoru Furukawa Zenji Horita Minoru Nemoto Terence G Langdon |
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| Affiliation: | (1) Structural Metals Division, MS-A25, Rockwell Science Center, 91360 Thousand Oaks, CA;(2) the Department of Technology, Fukuoka University of Education, Munakata, 811-4192 Fukuoka, Japan;(3) the Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, 812-8581 Fukuoka, Japan;(4) Present address: Departments of Materials Science and Mechanical Engineering, University of Southern California, 90089-1453 Los Angeles, CA |
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| Abstract: | The influence of pressing speed in equal-channel angular (ECA) pressing was investigated using samples of pure Al and an Al-1
pct Mg alloy and a range of pressing speeds from ∼10−2 to ∼10 mm s−1. The results show that the speed of pressing has no significant influence on the equilibrium grain size, at least over the
range used in these experiments. Thus, the equilibrium grain sizes were ∼1.2 μm for pure Al and ∼0.5 μm for the Al-1 pct Mg alloy for all pressing conditions. However, it is shown that the nature of the microstructure is dependent
on the pressing speed, because recovery occurs more easily at the slower speeds, so that the microstructure is then more equilibrated.
There is also indirect evidence for the advent of frictional effects when the cross-sectional dimensions of the samples are
at or below ∼5 mm. |
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