بررسي ريز ساختار حاصل از شكل دهي نيمه جامد آلياژ Al-Si-Fe4-Mn2 تهيه شده به روش تبلور مجدد و ذوب جزيي ساختار تغيير فرم يافته

Evaluation of the Microstructure of Thixoformed Al-Si9-Fe4-Mn2 Alloy Processed by Recrystallization and Partial Melting of Deformed Structure

In this research, the effect of plastic deformation and semi-solid forming of deformed structure on the microstructure of AlSi9Cu3 alloy containing 4 wt% of iron after 5, 10, 15% deformation in warm rolling process have been investigated. The deformed specimens were reheated at 580°C for 15 minutes in a resistance furnace and then thixoformed in the semi-solid state. Optical microscope images revealed that the size of intermetallic compounds was reduced and good distribution of these particles were seen after thixoforming in comparison with the as-cast microstructure. After 10 to 15% plastic deformation of the specimens and partial melting, the matrix is composed of spherical a-Al grains embedded in Al-Si eutectic structure and well-distributed fine intermetallic phases. Gag and shrinkage porosity were reduced appreciably after thixoforming.