The effects of grain size and boundary stability on the mechanical fatigue properties nanocrystalline nickel thin films were examined. We found that tended to decrease with amount sodium allylsulfonate, solution side was larger than substrate side. dependence 0.2% proof strength, tensile limit could be expressed by Hall–Petch equation. strength annealed film are lower those as-deposited film, w...

In this study, waste shells of African giant snail (Achatina achatina L.) were explored as candidates for asbestos-free non-carcinogenic brake pads. The results obtained showed that the density, Brinell hardness, and compressive strength shell (SS) pads superior to commercial sample used comparison. These properties found decrease with increase in particle size, following a negative index power...

Displacive deformation via dislocation slip and deformation twinning usually plays a dominant role in the plasticity of crystalline solids at room temperature. Here we report in situ quantitative transmission electron microscope deformation tests of single crystal Sn samples. We found that when the sample size was reduced from 450 nm down to 130 nm, diffusional deformation replaces displacive p...