Analyzing the modifying ability of rods made from AD31 alloy waste by direct extrolling

Abstract

The results of studying the structure and properties of master-alloy rods produced from AD31 alloy extrusion waste by direct extrolling are presented. A SLiPP‑2.5 unit, which is part of the combined processing line in the laboratory of the Department of Metal Forming of the School of Non-Ferrous Metals of the Siberian Federal University, was used to make rods with a diameter of 9 mm from AD31 alloy waste. The process parameters for producing rods from AD31 aluminum alloy by direct extrolling were determined: elongation = 16.5, melt temperature = 760 ±10 °C, rolling strain = 50%, roll speed = 5 rpm. It was established that the initial structure of the master-alloy rod affects the melt, and the rods made from AD31 alloy extrusion waste by direct extrolling have a stable ultra-fine subgrain structure, which allows them to be applied to AD31 alloy. The Alcan test revealed that introducing 3 to 4% rod with a diameter of 9 mm into a solidifying AD31 alloy ingot at a melt temperature of 720 °C and a melt holding time of at least 3 min ensures a stable modifying effect.