Microstructure and tensile properties of thixo-diecast AZ91D magnesium alloy

China Foundry

关键词: AZ91D magnesium alloys;    semi-solid;    thixo-diecasting;    microstructure;    tensile properties;   

DOI  :  

来源: DOAJ

【 摘 要 】

The thixo-diecasting (TDC) process is the combination of semi-solid billet preparation technology and die casting technology. The TDC process not only keeps the characteristics of thixo-forming but also has high efficiency and low cost. In the present work, the microstructures and mechanical properties of an AZ91D magnesium alloy prepared by the thixo-diecasting (TDC) process were characterized in as-cast condition. The TDC alloy produced exhibits a unique microstructure containing α-Mg solid solution and β-Mg17Al12 intermetallic compound, and there are some small droplets and a small gray globule with eutectic structure in the primary α-Mg grains. The ultimate tensile strength and elongation of the TDC alloy also increase in comparison with other processes, such as thixocasting. Fracture surface observation shows that a crack mainly originates from the brittle fracture of the eutectic phases. The deformation of ductile α-Mg phase provides the TDC alloy with the main strain.

【 授权许可】

Unknown