ISSN:1000-8365 CN:61-1134/TG
Your Position :Home->Articles Online->2021 Vol.42 No.1

View Full-text
Effect of Fe and Cu on Solidification Behavior and Hot Tearing Sensitivity of Recycled 6061 Aluminum Alloy
Author of the article:HE Jiansong1 , SHI Mingbo2 , DU Jun2
Author's Workplace:1. Qingyuan Zhengtong Metal Products Limited Company, Qingyuan 511515, China; 2. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
Key Words:recycled 6061 aluminum alloy; hot tearing; thermal analysis; alloying; solidification process
Abstract:The influence of Fe and Cu impurity elements on the solidification characteristics and hot tearing sensitivity (HTS) of 6061 regenerated aluminum alloy was studied by using the double thermocouples thermal analysis and the constrained rod casting mold. The results show that with the increase of Fe and Cu content, the hot tearing sensitivity of recycled aluminum alloy increases gradually. Fe mainly affects the initial solidification behavior of the recycled 6061 aluminum alloy, improves the nucleation temperature and content of the Fe-rich phase of Al13Fe4, promotes the completion of dendrite lap during solidification, and hinders the liquid phase flow feeding. Cu mainly affects the final solidification behavior of the recycled 6061 aluminum alloy. The low melting point Al5Cu2Mg8Si6 phase significantly reduces the lower limit of the brittle temperature range and the strength of the paste zone near the solid phase line, leading to the deterioration of the thermal cracking performance.