The influence of solution heating at 540°C 1–6 hours, quenching into 20°C cool water and ageing at 175°C 2–8 hours in air on transformation of acicular, plate-like and flake-like morphologies to broken grains and gradually form round to globular ones was researched.
The microstructural eutectic silicon, α-aluminium, acicular intermetallic phases in high silicon aluminium alloys were examined with confidence microscopy, scanning electron microscopy and X-ray.
The results showed that the solution treatment at 540°C 1–2 hour then quenching attained very positive influence on the alloy's tensile strength.
Aluminium alloys, Solution treatment, Ageing, Acicular eutectic silicon, Intermetallic phase, Tensile strength, Hardness
