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In this paper, we fabricated two kinds of microsized pillars with a size of 10 mm×10 mm×20 mm from AlMg alloy with large grains by focused ion beam. One pillar is single crystalline with crystal orientation of [023] and the other is bicrystalline with [023] and [225] crystal orientations. We conducted microcompression tests for the two kinds of pillar. The mechanical testing of bicrystalline pillar show stronger workhardening than that of the single crystalline pillar. This could come from an increasing of deformation resistance by the grain boundary in bicrystal. The strong sliding traces in deformed single crystalline pillar corresponded to (1̃11)[101] slip system. It was observed in deformed bicrystalline pillar that (1̃11)[101] slip system was activated on the compression process and the sliding propagated to another slip system in other grains. [doi:10.2320/jinstmet.JB201517]

Deformation Behaviour of Al-Mg Alloy Bi-Crystal Micro-Pillar Evaluated by Micro-Compression Test