Engineering Science and Materials Commons^™

Corrosion-induced damage in ZK60A magnesium alloy is analyzed via chemo-mechanical tests. A certain “diffusion” corrosion layer (DCL) is identified, where partial corrosion takes place. This layer is different from the corrosion product layer (CPL). Nanoindentation analysis shows that corrosion modifies mechanical properties in the DCL, which extends up to 8–9 micrometers into the bulk, away from the CPL. Measurements over the DCL indicate a lower elastic modulus and lower fracture toughness compared with the bulk, as well as higher variance (heterogeneity). Elemental analysis confirms the layer is composed of partially oxidized magnesium and diffused chloride ions. Gradual changes in mechanical …

ABSTRACT: Dynamic morphing of marine species to match with environment

changes in color and texture is an advanced means for surviving, self-defense, and

reproduction. Here we use colloids that are placed inside a multilayered structure to

demonstrate color and texture morphing. The multilayer is composed of a thermal

insulating base layer, a light absorbing mid layer, and a liquid top layer. When external

light of moderate intensity (∼0.2 W cm−2) strikes the structure, colloids inside the

liquid layer will be assembled to locations with an optimal absorption. When this

system is exposed to continuous laser pulses, more than 18 000 …