Strengthening behaviour of forged in-situ developed magnesium composites

Abstract

ABSTRACT Mg alloys/composites can fulfil evolving needs of the automotive industry. Mg-based in-situ developed metal matrix nano-composites (MMnCs) are not researched well. In the present study, Mg-based hybrid MMnCs have been developed by in-situ reinforcement of MgO and CeO2 particles through the stir casting process. The minimum reinforcement size has been confirmed as 20 nm during transmission electron microscopy (TEM). MMnCs were subjected to high-temperature press forging. Thus,significantly reducing porosity. The evolved texture, mechanical properties were evaluated near the central and peripheral regions of the forged disk. Fractography was carried out to confirm the nature of the fracture. The Central region of disk showed better mechanical properties than peripheral region. The dominant presence of basal texture near the peripheral area led to tensile twinning and, thus, prominent strain hardening during compression. Further, strengthening mechanisms were used to predict the yield strength. It is found that Taylor’s strengthening is the dominant strengthening mechanism.