from the conferences organized by TANGER Ltd.
Mechanical alloying (MA) of light metal powders with addition of other metal-oxides is a very promising method for production of high strength metallic composites. Of particular interest are the aluminum matrix composites reinforced by heavy metal oxides (MeO), which cannot be produced by means of common metallurgical processes due to the high reactivity of components. In this work, mechanical alloying and hot extrusion method was used to manufacture Al-based composite reinforced by 12.8 wt.% addition of AgO. Structure observations of as extruded Al-AgO composite revealed well-consolidated material having nanoscale structure. Annealing experiments were performed to test the material thermal stability and to analyze the effect of chemical reaction between components on the material structure. The annealing of as extruded samples at 773 K results in the reduction of the materials hardness from 178 HV to 120 HV for as-extruded material and sample annealed for 7 days, respectively. Received results are discussed on the basis of SEM and TEM observations, which have revealed specific structural processes responsible for the material hardness vs. annealing time reduction.
Keywords: Mechanical alloying, aluminum composite, powder metallurgy, powder’s consolidation© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.