Ming Sun, Mark A. Easton, David H. StJohn, Guohua Wu, Trevor B. Abbott and Wenjiang Ding Grain Refinement of Magnesium Alloys by Mg–Zr Master Alloys: The Role of Alloy Chemistry and Zr Particle Number Density Advanced Engineering Materials 15
The grain size of Zr-refined Mg alloys is controlled by two factors: the size of the nucleation-free zone, xnfz, where once a nucleation event occurs no further nucleation is possible within this zone; and the Zr particle number density of particle sizes between 1 and 5 µm. The particle number density increases with Zr addition as does the Q-value, which in turn reduces the value of xnfz and the average distance between potent Zr particles, xSd. The Interdependence equation has been modified to predict xSd.
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