A new high shear degassing technology and mechanism for 7032 alloy  

作　　者：Yu-bo Zuo Yi-yao Kang Yue Lin Xu-dong Liu Chao Sun Sen-sen Yuan Jian-zhong Cui 

机构地区：[1]Key laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University

出　　处：《China Foundry》2015年第4期293-298,共6页中国铸造（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(51104043 and 51374067);the Outstanding Young Scholars Growth Plan in the Colleges and Universities of Liaoning Province(LJQ2014032);the National Basic Research Program of China(2012CB619506)

摘　　要：Degassing is very important for aluminum alloys especially for 7xxx series alloys. In the present study, a high shear technology was used to degas 7032 aluminum alloy in order to study its degassing efficiency. The experimental results showed that the high shear technology can significantly degas 7032 aluminum alloy. By applying intensive melt shearing and an Ar injection of 60 seconds, the density index, D,, was reduced from 13.25% to 0.28% and the hydrogen concentration was significantly i＇educed from 0.31 to 0.10 mL/100g AI. Compared with the conventional rotary degassing, high shear technology showed a much higher degassing efficiency, achieving a lower concentration of hydrogen in a shorter time. The water simulation experiment was used to study the mechanism of the high degassing efficiency. The small bubble size and the uniform distribution of Ar bubbles with the application of high shear technology are believed to be the main cause for the high degassing efficiency.Degassing is very important for aluminum alloys especially for 7xxx series alloys.In the present study,a high shear technology was used to degas 7032 aluminum alloy in order to study its degassing efficiency.The experimental results showed that the high shear technology can significantly degas 7032 aluminum alloy.By applying intensive melt shearing and an Ar injection of 60 seconds,the density index,D_i,was reduced from13.25%to 0.28%and the hydrogen concentration was significantly reduced from 0.31 to 0.10 mL/100 g Al.Compared with the conventional rotary degassing,high shear technology showed a much higher degassing efficiency,achieving a lower concentration of hydrogen in a shorter time.The water simulation experiment was used to study the mechanism of the high degassing efficiency.The small bubble size and the uniform distribution of Ar bubbles with the application of high shear technology are believed to be the main cause for the high degassing efficiency.

关 键 词：aluminum alloy hydrogen DEGASSING intensive melt shearing POROSITY water simulation 

分 类 号：TG146.21[一般工业技术—材料科学与工程]