Ming Sun, Guohua Wu
The grain refining efficacy of three types of Mg-Zr master alloys have been evaluated in three Mg-Gd-Y based alloys. The Zr particle size distribution of each master alloy was measured showing that the three master alloys vary in size distribution and particle number density. It is shown that the observed differences in the microstructure of the master alloys have a significant influence on their grain refining performance. The master alloy with the highest number density of particles less than 10 µm was found to be the most effective grain refiner. The experimental results were examined by fitting the grain size data to the equation d = a + b/Q where d is the grain size, Q is the growth restriction factor and a and b are fitting constants. This analysis showed that the addition of Zr master alloy to the base alloys dramatically reduces the grain size (and the value of a) and also significantly reduces the slope of the line of best fit, b, from about 3900 to 1650, highlighting Zr effectiveness as a grain refiner. The three master alloys have similar slopes but different values of the intercept a. The latter finding is mainly attributed to differences in the number density of Zr particles between the master alloys that become active nucleants for the magnesium alloy grains.
@article{d8f063b7-c285-497d-a04a-5d27bcd3e348,
title={A COMPARISON OF THE MICROSTRUCTURE OF THREE Mg-Zr MASTER ALLOYS AND THEIR GRAIN REFINEMENT EFFICIENCY},
author={Ming Sun and Guohua Wu},
year={2026},
language={en}
}TY - JOUR TI - A COMPARISON OF THE MICROSTRUCTURE OF THREE Mg-Zr MASTER ALLOYS AND THEIR GRAIN REFINEMENT EFFICIENCY AU - Ming Sun AU - Guohua Wu PY - 2026 LA - en ER -
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