摘要
采用超声半连续铸造方法制备了3种不同杂质Fe质量分数的2219铝合金铸锭,并结合OM、SEM、力学拉伸实验、电化学实验等分析测试方法,研究了Fe质量分数对2219铝合金组织和性能的影响.结果表明,当Fe元素超过一定质量分数后,有Al7Cu2(FeMn)相析出,且残余结晶相体积分数增加,导致合金强塑性与耐腐蚀性能下降. 2219铝合金的室温断裂行为主要由Al7Cu2(FeMn)相的脆断、Al2Cu相在锻造过程中所形成的裂纹源扩展方向及粗大结晶相与基体界面结合强度低三方面因素综合影响.
Three kinds of 2219 aluminum alloy with different iron Fe mass fractions were produced by ultrasonic semi-continuous casting method.The influence of Fe mass fraction on microstructure and properties of 2219 aluminum alloy was investigated by OM,SEM,tensile tests and electrochemical corrosion experiment.The results showed that the mechanical properties and corrosion resistance decreased obviously with the increase of Fe mass fraction,which was attributed to the generation of massive primary Al7Cu2(FeMn)phase and the increase of volume fraction of residual crystalline phases.The tensile fracture behavior of 2219 aluminum alloy at room temperature was mainly influenced by the brittle fracture of Al7Cu2(FeMn)phase,the crack direction of Al2Cu phase formed in the forging process and the low bonding strength at coarse residual crystalline phase/Al matrix interfaces.
作者
徐道芬
陈康华
陈运强
邢军
陈送义
李晓谦
XU Daofen;CHEN Kanghua;CHEN Yunqiang;XING Jun;CHEN Songyi;LI Xiaoqian(Light Alloy Research Institute,Central South University,Changsha 410083,China;Department of Mechanical Engineering,Guilin University of Aerospace Technology,Guilin 541004,China;State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2020年第6期116-124,共9页
Journal of Hunan University:Natural Sciences
基金
国家重点研发计划资助项目(2016YFB0300801)
国家自然科学基金委员会-中国航天科技集团公司航天先进制造技术研究联合基金资助项目(U1637601)。
关键词
2219铝合金
FE
显微组织
力学性能
腐蚀行为
2219 aluminum alloy
Fe
microstructures
mechanical property
corrosion behavior
