中國有色金屬學報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 36 No. 1 January 2026 |
（a National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China;
b National Key Laboratory of Advanced Casting Technologies, Chongqing University, Chongqing 400044, China;
c College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China）
Abstract:The dependence of shrinkage porosities on microstructure characteristics of Mg-12Al alloy was investigated. The distribution, morphology, size, and number density of shrinkage porosities were analyzed under different cooling rates. The relationship between shrinkage porosities and microstructure characteristics was discussed in terms of temperature conditions, feeding channel characteristics, and feeding capacity. Further, the feeding behavior of the residual liquid phase in the solid skeleton was quantified by introducing permeability. Results show a strong correlation between the solid microstructure skeleton and shrinkage porosity characteristics. An increase in permeability corresponds to a declining number density of shrinkage porosities. This study aims to provide a more complete understanding how to reduce shrinkage porosities by controlling microstructure characteristics.
Key words: Mg-12Al alloy; shrinkage porosity; solidification; microstructure characteristics; morphological characteristics
