Developing stable fine-grain microstructures by large strain deformation

F.J. Humphreys, P.B. Prangnell, Jacob R. Bowen, A. Gholinia, C. Harris

Research output: Contribution to journalJournal articleResearchpeer-review


Methods of deforming metals to large strains are reviewed and the process of equal
channel angular extrusion is analysed in detail. The development of microstructure
during large strain deformation is discussed, and it is concluded that the main criterion
for the formation of a sub-micron grain structure is the generation of a sufficiently
large fraction (greater than 0.7) of high-angle grain boundary during the
deformation process. For aluminium alloys, it is found that a low-temperature anneal
is required to convert the deformed microstructure into an equiaxed grain structure.
The material, microstructural and processing factors that influence the formation of
such fine-grain microstructures are discussed, and the stability of these microstruc?
tures at elevated temperatures is considered.
Original languageEnglish
JournalRoyal Society of London. Philosophical Transactions. Mathematical, Physical and Engineering Sciences
Issue number1756
Pages (from-to)1663-1681
Publication statusPublished - 1999
Externally publishedYes


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