Microstructure of AZ91-Ti6Al4V metal-metal composite in as-cast conditions and after heat treatment
Katarzyna N. Braszczyńska-Malik, Elżbieta Przełożyńska
Quarterly No. 4, 2014 pages 224-228
DOI:
keywords: metal-metal composite, AZ91 magnesium alloy, Ti6Al4V particles, heat treatment, microstructure
abstract The results of structure investigations of an experimental magnesium matrix composite reinforced with Ti6Al4V particles in as-cast conditions and after heat treatment are presented. The commercial AZ91 magnesium alloy was used as the matrix alloy. The experimental composite was reinforced with 30 wt.% Ti6Al4V alloy spherical particles. The investigated material was obtained by the stir-casting method. The microstructure of the fabricated composites was characterized by uniform distribution of the titanium particles within the magnesium matrix. The phase composition of the composite was typical for the used component. New phases were not revealed by XRD techniques. Solution annealing at 693 K for 24 h and 48 h (with water quenching), followed by ageing at 423 K for 16 h was carried out. After ageing discontinuous precipitation process of the γ phase (typical for AZ91 magnesium alloy) was observed. The applied heat treatment processes did not bring about changes in the chemical composition between the used components.