ABSTRACT
In-situ magnesium matrix nano-composites were produced through a reaction of CO2 with the AZ91 alloy at a semi-solid temperature range. The process was performed at 595°C, which corresponded to about 10% of solid fraction, under shear and mixing conditions generated by a screw-barrel system. As a result, nano-scale native MgO (30–50 nm) and a small amount of Al4C3 carbide within an eutectic consisting of α(Mg), β-Mg17Al12 were formed. Homogeneously distributed α(Mg) globular grains with volume 8–12% were visible. AZ91 composites revealed yield strength of 220 MPa at compression strength of 460 MPa and hardness 103 ± 2 HV.
Disclosure statement
No potential conflict of interest was reported by the authors.