Abstract
A reduction of the mean grain size in metallic alloys is expected to increase their yield stress at room temperature and to promote superplastic properties at higher strain rates and/or lower temperatures than those conventionally used in superplastic forming. By conventional thermomechanical treatments, grain sizes of about 10 µm are developed for aluminium-magnesium alloys and superplastic deformation is thus typically obtained at a temperature close to 500°C and a strain rate in the range 10−4–10−3 s−1 [1,2]. Very fine microstructures can be produced by severe plastic deformation. Equal channel angular extrusion (ECAE) is one of the most popular techniques and has been applied to aluminium alloys [3], particularly in the case of Al-Mg alloys due to their large industrial use, especially in terms of superplastic forming [1,2].
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