A multiple grain size distributed Al-based composite consist of amorphous/nanocrystalline, submicron grain and micron grain fabricated through spark plasma sintering

摘要

AbstractA multiple grain size distributed Al-based composite was fabricated through ball milling the amorphous powder mixed with pure Al powder followed by spark plasma sintering. The composite consisted of amorphous/nanocrystalline, submicron grain and micron grain, exhibiting outstanding mechanical properties. The superior strengthen effect of the amorphous/nanocrystalline region contributed to the exhibiting specific strength (5.66?×?105Nm/kg) of the composite. The orderly plastic deformation occurred within FCC-Al micron grain region and submicron grain region during compression. And the progressive deformation restrained the strain localization and unstable propagation of the crack, leading to the plastic deformation (4.3%) of the composite.Highlights?A multiple grain size distributed Al-based composite was obtained.?The composite consists of amorphous/nanocrystalline, submicron grain and micron grain.?The composite exhibits high specific strength of 5.66?×?105Nm/kg and plasticity of 4.3%.?The orderly plastic deformation restrained the plastic instability of the composite.]]>