OS0312 Mg-Zn-Y合金のマイクロスケール材料試験(非立方晶型金属材料の変形現象とそのモデル化,オーガナイズドセッション)

概要

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Micro mechanical testing has been carried out for micro-sized specimens prepared from each constituent in two phase Mg-Zn-Y alloys, and bending stress, fracture toughness were measured. Micro-sized cantilever beam type specimens with dimensions [〜!〜]10x20x50 μm^3 were prepared by focused ion beam machining from extruded Mg-Zn-Y alloys. In fracture tests, notches with a width of 0.5 μm and a depth of 5-10 μm were also introduced into the micro-sized specimens by focused ion beam machining. Micromechanical testing was performed by a mechanical testing machine we have developed. The bending strength of the specimen prepared from the LPSO (Long Period Stacking Ordered) phase is much higher than that prepared from α-Mg phase. This result strongly suggests that the strengthening mechanism of Mg-Zn-Y alloy is due to the existence of the LPSO phase. The fracture toughness values of specimens prepared from vertical plane to the extrusion direction were higher than those prepared from the parallel plane. This anisotropic fracture behavior is considered to be related with the texture of these alloys.
2009-07-24