Abstract—Abstract—In the present study, experimental work was performed to understand the solidification sequence and grain structure development of Mg-6wt.% Al-2wt.% Sr alloy (AJ62) under various applied pressures varying from 0 to 90 MPa. The analyses of recorded temperature histories indicate that the liquidus temperatures of the tested alloy during pressurized solidification increase when high pressures are exerted. The theoretical liquidus temperatures computed by the Clausius- Clapeyron equation deviate from the experimentally measured ones. The presence of the discrepancy suggests that, since it is almost impossible to experimentally measure local pressures in the cast alloy during solidification, the use of applied hydraulic pressures for the calculation of the theoretical liquidus temperatures should be responsible for the discrepancy. The microstructure analyses by optical microscopy show that the grain structures of the squeeze casting magnesium alloy AJ62 are refined with the application of pressures. The higher applied pressures result in the formation of the finer grains in the solidified alloy.
Index Terms—Applied pressures, grain refinement, Mg alloy, solidification, squeeze casting.
The authors are with Department of Mechanical , Automotive & Material Engineering, University of Windsor, Windsor, ON N9B 3P4 Canada (Corresponding author: Henry Hu; e-mail: ren11h@uwindsor.ca, zhang11w@uwindsor.ca, fangl@uwindsor.ca, huh@uwindsor.ca).
[PDF]
Cite: Luyang Ren, Xuezhi Zhang, Li Fang, and Henry Hu, "Fine Grain Microstructure of Mg-Al-Sr Alloy Solidified under High Pressures," International Journal of Materials, Mechanics and Manufacturing vol. 7, no. 5, pp. 214-218, 2019.
Copyright © 2019 by the authors. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (
CC BY 4.0).
![[Click]](http://www.ijmmm.org/img/ijmmm_v7n2_inspec%28IET%29_indexscreenshot.jpg){kind=link}