Aluminium matrix tungsten aluminide and tungsten reinforced composites by solid-state diffusion mechanism.

ABSTRACT: In-situ processing of tungsten aluminide and tungsten reinforced aluminium matrix composites from elemental tungsten (W) and aluminium (Al) was investigated by thermal analysis and pulsed current processing (PCP). The formation mechanism of tungsten aluminides in 80 at.% Al-20 at.% W system was controlled by atomic diffusion. The particle size of W and Al in the starting powder mixture regulated the phase formation and microstructure. PCP of micron sized elemental Al and W resulted in formation of particulate reinforcements, W, Al₄W and Al₁₂W, dispersed in Al matrix. W particles were surrounded by a ~3 μm thick dual-layer structure of Al₁₂W and Al₄W. The hardness of Al matrix, containing Al₁₂W reinforcements, was increased by 50% compa

SUBMITTER: Zhang H 

PROVIDER: S-EPMC5620082 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature