IMPACT AND ENERGY DISSIPATION CHARACTERISTICS OF SQUEEZE AND DIE CAST MAGNESIUM ALLOY AM60

摘要

High-pressure die cast (HPDC) magnesium alloy AM60 isrecognized for its versatility in the manufacturing of weightsensitive components of relatively thin cross section. To furtherexpand practical applications of the alloy, squeeze casting hasbeen proposed to allow for thicker castings. In this study, AM60alloy specimens of 10mm thickness were squeeze cast using ahydraulic press with an applied pressure of 60 MPa. Fractureenergies, following a Charpy Impact Testing protocol, of thesqueeze cast specimens were characterized in comparison with theHPDC counterparts using both experimental and numericaltechniques. The experimental results show the squeeze cast alloyabsorbing approximately 46.2% more energy during impact thanits HPDC counterpart. Scanning electron microscopyfractography reveals the favourable quasi-cleavage fracture modeof the squeeze cast alloy AM60, relative to the decohesive rupturefracture mode present in the die cast alloy.