Mechanical behavior of nanocrystalline aluminum-zirconium

摘要: An investigation of the room-temperature mechanical properties and deformation behavior nanocrystalline aluminum-zirconium has been conducted via microhardness, nanoindentation novel tensile experiments. Nanocrystalline specimens were produced by inert-gas condensation process with electron beam evaporation. The modulus elasticity Al-Zr was determined to be similar that coarse-grained aluminum. hardness, strength ductility samples, however, found strongly impacted grain size, which is reduced at higher zirconium levels. Extremely high hardnesses obtained for materials (up ~ 3 GPa), while strengths less impressive. Some in tension exhibited relatively large sizes (≥ 100 nm), although elongation failure dropped than 1% when grains stabilized 10 nm additions. This appears linked increasingly stresses required generate dislocations prevent crack propagation cause yielding as size into nanometer regime. At room temperature strain rate employed this study (10−4 s−1), no evidence suggest an alternative, diffusional-based mechanism takes over smallest sizes.