期刊
ACTA MATERIALIA
卷 49, 期 1, 页码 21-29出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S1359-6454(00)00308-6
关键词
equal-channel angular pressing (ECAP); microstructure; transmission electron microscopy (TEM); cold working; aluminium alloys
The microstructural changes of an aged Al-1.7 at% Cu alloy associated with severe plastic deformation have been studied by transmission electron microscopy (TEM) and energy-filtered transmission electron microscopy (EF-TEM). m theta' precipitates are almost completely dissolved after eight passes of equal-channel angular (ECA) pressing, and nearly single-phase alpha with a fine grain size of approximately 500 nm is obtained. When a severely deformed sample is aged for 24 h at 100 degreesC, precipitation of equiaxed theta phase is observed along the grain boundaries, whereas only Guinier-Preston (GP) zones are formed in the undeformed sample. The dissolution and precipitation processes in severely deformed Al-1.7 at% Cu alloy have been examined by TEM and energy-filter mapping. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.
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