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Mechanical properties and microstructure of ultrafine-grained magnesium alloys containg neodymium and zinc
 Šašek, Stanislav ; Stráská, Jitka (advisor) ; Krajňák, Tomáš (referee)
Two experimental magnesium alloys containing neodymium and zinc (Mg- 5Nd-1Zn and Mg-1Nd-1Zn) were processed by severe plastic deformation (SPD) method - equal channel angular pressing (ECAP). The influence of the processing on the microstructure was studied by light optical microscopy (LOM), transmis- sion electron microscopy (TEM) and also scanning electron microscopy (SEM) including electron backscatter diffraction (EBSD). A significant grain refinement was observed after the final stage of ECAP in both alloys resulting in homogenous ultra-fine grained condition. Microstructure development had a significant influ- ence on mechanical properties which were investigated by microhardness measu- rements and compression deformation tests. Both the yield compression strength σ0,2 and the microhadness significantly increased compared to the extruded/as- cast counterparts. 1
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