A Review on Porosity Formation in Aluminum-Based Alloys

• Published in: Materials Vol. 16; no. 5; p. 2047
• Main Authors: Samuel, Agnes M, Samuel, Ehab, Songmene, Victor, Samuel, Fawzy H
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 01.03.2023; MDPI
• Subjects: Alloying elements; Alloys; Aluminum; Aluminum base alloys; Analysis; Atmospheric pressure; Chemical composition; Chemical elements; Gases; Grain refinement; grain refining; Hydrogen; modification; Parameter modification; Photomicrographs; Pore size; Porosity; Review; Solidification; solidification rate; Solids; Specialty metals industry; Statistical analysis; statistical modeling; Statistical models; statistical modeling; hydrogen; grain refining; modification; porosity; solidification rate
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma16052047

The main objective of this review is to analyze the equations proposed for expressing the effect of various parameters on porosity formation in aluminum-based alloys. These parameters include alloying elements, solidification rate, grain refining, modification, hydrogen content, as well as the applied pressure on porosity formation in such alloys. They are used to establish as precisely as possible a statistical model to describe the resulting porosity characteristics such as the percentage porosity and pore characteristics, as controlled by the chemical composition of the alloy, modification, grain refining, and the casting conditions. The measured parameters of percentage porosity, maximum pore area, average pore area, maximum pore length, and average pore length, which were obtained from statistical analysis, are discussed, and they are supported using optical micrographs, electron microscopic images of fractured tensile bars, as well as radiography. In addition, an analysis of the statistical data is presented. It should be noted that all alloys described were well degassed and filtered prior to casting.