Effect of Pouring Temperature and Water Cooling on the Thixotropic Semi-solid Microstructure of A319 Aluminium Cast Alloy

Materials Research

Iman Sallah-eldeen El-mahallawi¹  Tamer Samir Mahmoud¹  Ahmed Mohamed Gaafer¹  Fouad Helmi Mahmoud¹ 

关键词: cooling slope casing;    microstructure;    thixotropic;    aluminium alloys;   

DOI  :  10.1590/1516-1439.304114

来源: SciELO

【 摘 要 】

The cooling slope (CS) casting is the simplest and cheapest technique for producing feedstock materials with non-dendritic microstructure. Such materials are required for semi-solid metal (SSM) processing methods such as thixoforming. In the present investigation, the effect of the pouring temperature and the water cooling on the thixotropic microstructure of commercial A319 Al-Si cast alloy was studied. The results showed that increasing the pouring temperature slightly reduces the bulk porosity of the CS ingots. The ingots poured with water-cooling exhibited slightly lower porosity content than those poured with without water-cooling. Generally, the primary α-Al grains exhibited higher shape factor near the edge of ingot than the middle and center. Ingots poured with water-cooling exhibited lower grain size and shape factor than those poured without water-cooling. Increasing the pouring temperature increases the size α-Al grains.

【 授权许可】

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