摘要
对锂离子电池用AA8014铝合金铸锭进行了525℃、55O℃和575℃,保温16 h、20 h和24 h的均匀化退火工艺试验。利用扫描电镜及能谱分析仪、金相显微镜、Image Pro软件和电导仪,研究了均匀化退火工艺对第二相类型、形貌、尺寸分布和合金导电率的影响。结果表明:铸态及均匀化样品存在含Mn的AlFeMn相、Al_(6)(FeMn)相及少量的Al_(15)(FeMn_(3)Si_(2))相;均匀化后粗大第二相发生分断,最佳保温时间为20 h,保温时间延长到24 h,第二相粒子发生了粗化;均匀化温度由525℃上升到575℃,10 μm以下的第二相粒子数量明显增多,而10μm以上的第二相粒子数量明显减少;铸态合金导电率为43.7%IACS,525℃,550℃和575℃均匀化退火20 h后,导电率分别为49%IACS.48%IACS和45%IACS左右,合金元素的固溶度随着温度升高而升高。
The homogenization process of AA8014 aluminum alloy used for the lithium ion battery was tested at 525℃,550℃and 575℃for 16 h,20 h and 24 h,respectively.The evolution of the type,the morphology,size distribution of the second phase was studied with SEM,energy spectrum analyzer,metallographic microscope and Image Pro software,respectively.The conductivity was measured with the conductivity meter.The results show that AIFeMn phase,Al_(6)(FeMn)phase and a small amount of Al_(15)(FeMn_(3)Si_(2))phase exist in the as-cast samples and those after homogenization.The coarse second phase dissolves intermittently and the optimum holding time is 20 h during the homogenization process.The second phase coarsening happenes when the homogenization time increases to 24 h.When the homogenization temperature is increased from 525℃to 575℃,the number of the second phase particles below 10μm is increased significantly,and the number of the second phase particles above 10μm decreases significantly.The conductivity of as-cast samples is 43.7%IACS and increased to 49%IACS,48%IACS and 45%I ACS approximately after homogeniza tion at 525℃,550℃ and 575℃ respectively for 20 h.The solid solubility of alloy elements increases with the increase of homogenization temperature.
作者
刘金炎
阙石生
邓桢桢
马科
陈伟
郭世杰
赵丕植
LIU Jin-yan;QUE Shi-sheng;DENG Zhen-zhen;MA Ke;CHEN Wei;GUO Shi-jie;ZHAO Pi-zhi(Chinalco Materials Application Research Institute Co.,Ltd.,Beijing 102209,China;Chinalco Ruimin Co.,Ltd.,Fuzhou 350015,China;Chinalco Research Institute of Science and Technology Co.,Ltd.,Beijing 102209,China)
出处
《轻合金加工技术》
CAS
2021年第7期22-27,41,共7页
Light Alloy Fabrication Technology
基金
中国铝业集团有限公司科技发展基金项目(2018KJZD13)。
关键词
AA8014铝合金
均匀化
第二相分布
相类型
AA8014 aluminum alloy
homogenization
second phase distribution
phase type
