Grain Refinement of Aluminium Alloys: Recent Developments in Predicting the As-Cast Grain Size of Alloys Refined by Al-Ti-B Master Alloys

摘要: This paper presents the results of recent research on grain refinement aluminium alloys. There has been considerable development in our understanding mechanisms controlling over last decade and these will be briefly described. In particular, Interdependence Model clearly explained interdependence between growth grains nucleation potency refining particles causing a wave events throughout casting. interaction determines final as-cast size. A key factor identified by this is formation nucleation-free zone front growing that prevents up to point where critical amount constitutional supercooling established allowing next event occur. Thus, size determined distance most potent particle. The can, therefore, used predict changes with composition nucleant particle density. develop equations for predicting alloys when refined Al-Ti-B master performance Al-5Ti-1B Al-3Ti-1B are compared light Model.