DESIGNER CRYSTALLINE AGGREGATES: A PROPOSED TOOL TO EVALUATE THE ROLE OF GRAIN-GRAIN INTERACTIONS ON EVOLUTION OF DEFORMATION TEXTURES AND MICROSTRUCTURES

摘要

It is proposed that dimensionally realistic polycrystalline materials with ideally oriented grains can be repeatedly fabricated using focused ion beam machining and micro-manipulation techniques. Such a designer crystalline aggregate (DCA) consists of an ideally oriented crystal (< 50 mu m) surrounded by at least one ideally oriented neighbour of similar shape and size. The DCAs are constructed from re-oriented single crystals sectioned from a well-characterized polycrystal. The example reported is for {110}<1-12> and {001}<010> oriented monocrystals of 99.9995 percent aluminium. Experimental methodology including inherent benefits and difficulties with this approach are described.