STUDY OF CHARACTERISTICS OF Al + 5 wt.% TiO_2 + 6 wt.% Gr HYBRID P/M COMPOSITE POWDERS PREPARED BY BALL MILLING PROCESS

摘要

This paper is an attempt to understand the characteristics of Al + TiO_2 + Gr hybrid ball milled composite powders, which is anticipated to have large application in the near future. Aluminium with titanium dioxide (TiO_2) and graphite (Gr) powders was ball milled in order to yield the composition like: Al + 0% TiO_2, Al + 5% TiO_2, Al + 5% TiO_2 + 2% Gr, Al + 5% TiO_2 + 4% Gr and Al + 5% TiO_2 + 6% Gr. From the X-Ray diffraction analysis of the milled powders, the grain size, lattice space, lattice constant, stress, strain, dislocation density and unit cell volume were calculated. Compressibility was performed in a hardened steel die at pressures between 100 to 500 MPa to determine Al with 5 wt.% TiO_2 and 2 & 4 wt.% of Gr powder mixtures. For understanding of compaction behavior of aluminum based hybrid composites reinforced with TiO_2 and Gr particles under various applied pressure conditions, experimental research has been made using several powder compaction equations. Microstructure analysis for Al + 5% TiO_2 + 6% Gr composite has been reported.