Grain refinement of Mg-alloys by native MgO particles: An overview

A fine and equiaxed solidification process delivers multidimensional benefits to Mg-alloys, such as improved castability, reduced casting defects, enhanced mechanical properties, increased corrosion resistance potential for recycled contents. Despite extensive research on grain refinement of Mg-alloys in the last few decades, currently, there is no effective refiner available refining Mg-Al alloys, our current understanding mechanisms not adequate facilitate development refiners. Under EPSRC (UK) LiME Hub's program, substantial advances have been made early stages covering prenucleation, heterogeneous nucleation, initiation refinement. In this paper, we provide a comprehensive overview by native MgO particles. We show that particles can be intensive melt shearing regardless alloy compositions. More importantly, demonstrate (1) addition more potent exogenous will than MgO; (2) are difficult impotent through promoting explosive initiation. suggest most approach make dispersion, shearing.