摘要
采用砂纸打磨、化学清洗、电解抛光+化学清洗三种不同的表面处理方式对2024铝合金开展了热变形连接实验,通过OM、SEM、EBSD等表征手段研究了不同表面处理状态下的界面微观组织及界面愈合效果。结果表明:三种表面处理方式下界面氧化物元素种类相同,氧化物数量和尺寸存在一定差异。保温4 h后,基体中第二相颗粒沿晶界及连接界面大量析出,砂纸打磨的试样界面处氧化物及第二相颗粒约占界面的32%;化学清洗试样约为42%;电解抛光+化学清洗试样界面处氧化物约占界面的28%。界面在不连续动态再结晶和连续动态再结晶的共同作用下实现愈合。根据连接界面微观组织特征,采用界面愈合率来评价界面愈合程度,经统计计算,界面愈合率的顺序为:电解抛光+化学清洗>砂纸打磨>化学清洗。
Three different surface treatments—sandpaper polishing,chemical cleaning,and electrolytic polishing combined with chemical cleaning are employed to conduct hot compression bonding tests on 2024 aluminum alloy.The interface microstructure and the interface healing effect under different surface treatment conditions are investigated using characterization techniques such as OM,SEM,and EBSD.The results reveal that under the three surface treatment conditions,the types of interfacial oxide elements are identical,while variations exist in the quantity and size of the oxides.After holding for 4 h,second-phase particles within the matrix precipitate extensively along grain boundaries and at the bonding interface.For the sandpaper-polished specimen,oxides and second-phase particles at the interface account for approximately 32%of the interface area;this proportion is about 42%for the chemically cleaned specimen,and roughly 28%for the specimen subjected to electrolytic polishing combined with chemical cleaning.Interface healing is achieved through the synergistic action of discontinuous dynamic recrystallization and continuous dynamic recrystallization.Based on the microstructural characteristics of the bonding interface,the interface healing rate is utilized to evaluate the degree of interface healing.After statistical calculations,the order of the interface healing rate is as follows:electrolytic polishing combined with chemical cleaning>sandpaper polishing>chemical cleaning.
作者
张晓鹏
陈学文
汪建强
周正
吴升清
孙明月
ZHANG Xiaopeng;CHEN Xuewen;WANG Jianqiang;ZHOU Zheng;WU Shengqing;SUN Mingyue(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,Henan,China;Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)
出处
《材料工程》
北大核心
2026年第3期161-169,共9页
Journal of Materials Engineering
基金
国家重点研发计划项目(2018YFA0702900)
国家自然科学基金项目(52173305,52101061,52233017,52203384)。
关键词
2024铝合金
热变形连接
表面处理
氧化物
界面愈合率
2024 aluminum alloy
hot compression bonding
surface treatment
oxides
interface bonding ratio
