摘要
采用等通道转角挤压(ECAP)和时效热处理相结合的方法制备了高强塑性建筑铝型材,研究了等通道转角挤压+时效态Al-Mg-Si合金的微观结构和力学性能的变化规律。结果表明:室温ECAP+时效处理和110~191℃ECAP+时效处理的AlMg-Si合金的平均晶粒尺寸介于102~176 nm,晶粒尺寸较为细小;Al-Mg-Si合金在等通道转角挤压+时效处理过程中会析出大量的β″相和β’相;经过等通道转角挤压+时效处理后,Al-Mg-Si合金的抗拉强度和屈服强度相较于固溶态和T6态均有所增大,而断后伸长率相较于固溶态降低;随着时效温度的升高,ECAP+时效态Al-Mg-Si合金的强度和断后伸长率均呈现先增加、后减小的特征,110℃ECAP+时效态试样具有最高的强度和较高的断后伸长率,170℃ECAP+时效态试样具有最大的断后伸长率和较高的强度,这主要与等通道转角挤压+时效处理过程中的晶粒细化、位错强化和析出相的弥散强化作用有关。
The high-strength plastic building aluminum profiles were prepared by the method of equal channel angular pressing(ECAP)and aging heat treatment,and the change laws of microstructure and mechanical properties for Al-Mg-Si alloy with ECAP+aging were studied.The results show that the average grain size of Al-Mg-Si alloy treated by ECAP at room temperature and aging and ECAP at 110-191℃and aging is 102-176 nm,which is relatively small,and a lot ofβ″andβ’phases of Al-Mg-Si alloy are precipitated in the process of ECAP and aging treatment.After ECAP and aging treatment,the tensile strength and the yield strength of Al-Mg-Si alloy increase compared with the solid solution and T6 states,while the elongation decreases compared with the solid solution state.With the increasing of aging temperature,the strength and elongation of ECAP+aged Al-Mg-Si alloy increase first and then decrease,the ECAP+aged sample at 110℃has the highest strength and higher elongation,and the ECAP+aged sample at 170℃has the highest elongation and higher strength,which are mainly related to grain refinement,dislocation strengthening and precipitation dispersion strengthening during ECAP and aging treatment.
作者
杨洁
卢生
秦二丽
Yang Jie;Lu Sheng;Qin Erli(College of Architecture and Materials,Hubei Light Industry Technology Institute,Wuhan 430070,China;School of Materials Science and Engineering,Central South University,Changsha 410083,China)
出处
《锻压技术》
CAS
CSCD
北大核心
2020年第10期185-191,共7页
Forging & Stamping Technology
基金
国家自然科学基金资助项目(51571083)
湖北省教育厅指导性项目(B2018477)。
