What is it about?
The effect of chromium content on the microstructural evolution of primary and secondary Fe-rich compounds in a high-pressure die-cast AlSi9Cu3(Fe) alloy is reported and then addressed to the impact toughness of the material. Metallographic and image analysis techniques have been used to quantitatively examine the microstructural changes occurring at different Cr levels.
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Why is it important?
The results reveal that the salient microstructural features of diecastings, such as segregation bands and externally solidified grains, are not affected by Cr content, which contrary promotes the formation of primary sludge particles and proeutectic α-Alx(Fe,Mn,Cr)ySiz intermetallic compounds. Any increase in the amount of these Fe-rich particles is coupled with an increase in their size.
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This page is a summary of: The role of Cr additions and Fe-rich compounds on microstructural features and impact toughness of AlSi9Cu3(Fe) diecasting alloys, Materials Science and Engineering A, May 2014, Elsevier,
DOI: 10.1016/j.msea.2014.02.071.
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