Equal-channel angular pressing of an Al-6061 metal matrix composite |
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| Authors: | Yong Li Terence G Langdon |
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| Affiliation: | (1) Departments of Materials Science and Mechanical Engineering, University of Southern California, Los Angeles, CA 90089-1453, USA;(2) Departments of Materials Science and Mechanical Engineering, University of Southern California, Los Angeles, CA 90089-1453, USA |
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| Abstract: | An Al-6061 metal matrix composite, reinforced with 10 vol % Al2O3 particulates, was subjected to equal-channel angular (ECA) pressing at room temperature to a total strain of  5. It is shown that the intense plastic straining introduced by ECA pressing reduces the grain size from 35  m to 1 m and this leads to an increase in the microhardness measured at room temperature. Inspection revealed some limit cracking of the larger Al2O3 particulates as a consequence of the ECA pressing. Tensile testing after ECA pressing gave a maximum ductility of 235% at a temperature of 853 K when testing at strain rates from 10–4 to 10–3 s–1. It is suggested that high strain rate superplasticity is not achieved in this material after ECA pressing due to the presence of relatively large Al2O3 particulates. |
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