Use of WE DM in the Characterization Process of Al/2-Phase Systems Consolidated by Multilayer Cylindrical Dynamic Compaction Method

摘要

The aim of this paper is to present an exploratory process to characterize fabricated 2-phase aluminum metal-matrix systems (2-phase systems) by using a dynamic consolidation technique, with an arrangement of multilayer mixings in steel cylinders. Aluminum powder (～150mm) was mechanically mixed with different fractions of multi-wall carbon nano-tubes (MWCNTs, 2 and 5 percent), with ～30 nm and ～30 μm diameter SiC and Al_2 O_3 powders (in volume fractions of 2, 4, and 21 percent), then, were green compacted uniaxially to ～80 % density, to be finally explosively consolidated with ammonium nitrate-fuel oil (ANFO) and C3. After compaction, WEDM (wire electrical discharge machining) was used to prepare tensile and hardness testing samples, also TEM, light microscopy and SEM characterization samples, all by using ～25 % of the obtained material, this represents less than l0cc , preserving ～60 % of the obtained monoliths. Densities of the consolidated monoliths achieve an average of ～98 % compaction (measured by Archimedes technique). Observations and measured hardness (HRE) reveal well compacted systems with a hardness consistent along the composites. Using light microscope imaging different zones were identified showing different grain behaviors.