Grain Refinement of Magnesium Alloys by Mg–Zr Master Alloys: The Role of Alloy Chemistry and Zr Particle Number Density |
| |
| Authors: | Ming Sun Mark A Easton David H StJohn Guohua Wu Trevor B Abbott Wenjiang Ding |
| |
| Affiliation: | 1. National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University, Shanghai 200240, China;2. CAST Cooperative Research Centre, Department of Materials Engineering, Monash University, Victoria 3800, Australia;3. CAST Cooperative Research Centre, Centre for Advanced Materials Processing and Manufacturing (AMPAM), School of Mechanical and Mining Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia;4. Magontec Ltd, Sydney, New South Wales 2000, Australia |
| |
| Abstract: | Although refinement of the as‐cast grain size of magnesium alloys by Zr is well established commercially, little research has been undertaken to optimize this refinement technology and to quantify the relative performance of different Mg–Zr master alloys. The performance of Mg–Zr master alloys was found to be related to (1) the number density of Zr particles between 1 and 5 µm in size where the master alloy with the largest number density of these particles exhibits the best refinement, and (2) the alloy's growth restriction factor (Q) where a linear relationship between grain size and 1/Q, was found to exist for each master alloy. An equation for predicting grain size based on the Interdependence model was developed. Further, the Interdependence Model was improved to be able to cater for an increasing Zr particle number density with increasing values of Q. |
| |
| Keywords: | |
|
|
