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Mechanical behaviour of ultrafine grained aluminium containing Al 8 Fe 2 Si precipitates
Author(s) -
Korchef A.,
Kolsi A. W.,
Njah N.
Publication year - 2006
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200521531
Subject(s) - materials science , grain boundary , aluminium , metallurgy , pressing , dissolution , diffraction , hardening (computing) , grain size , strain hardening exponent , volume fraction , crystallography , composite material , microstructure , chemistry , physics , layer (electronics) , optics
Abstract A 99.1% aluminium was deformed by Equal Channel Angular (ECA) pressing. The material contains a low volume fraction of Al 8 Fe 2 Si precipitates located essentially at the grain boundaries. An important increase of the X‐ray diffraction peak broadening was observed after ECA pressings. This is due to grain refinement and enhanced lattice distortions. This was accompanied by a lattice decrease due to compressive stresses and partial dissolution of the Al 8 Fe 2 Si precipitates. The grain refinement leads to a significant improvement of the mechanical properties in compression and tension after the first pass through the die. Thereafter, the increase was less significant. The strengthening of the material was accompanied by decreased strain hardening, due to enhanced activities in grain boundaries. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)