摘要
砂型铸造Al-4.4Cu-0.6Mn铝合金,经530℃×14 h的固溶以及170℃×6 h、8 h、10 h的人工时效,具有良好的机械性能,时效时间为8 h时,合金的抗拉强度最高,为479 MPa.采用光学显微镜(Optical Microscope,OM)、透射电镜(Transmission Electron Microscope,TEM)、扫描电镜(Scanning Electron Microscope,SEM)及其附件能谱仪(Energy Dispersive Spectroscopy,EDS)研究不同时效时间Al-4.4Cu-0.6Mn合金的显微组织.结果表明:Al-4.4Cu-0.6Mn合金的组织由α(Al)基体+断续网状的Al-Cu金属间化合物+棒状的Al-Ti化合物+细小的弥散相组成.合金的强化相由在晶界呈断续网状的Al_(2)Cu与棒状Al_(3)Ti,在晶内的Ω相与T(Al_(20)Cu_(2)Mn_(3))相组成;在不同时效时间下,合金的断裂方式以脆性断裂为主,局部存在韧性断裂.
The Al-4.4 Cu-0.6 Mn alloy is prepared by sand casting method and exhibits excellent mechanical properties by solid-solution at 530℃×14 h and artificial aging at 170℃×6 h,8 h,10 h and 12 h.The highest tensile strength is 479 MPa when the aging time is 8 h.The microstructure of Al-4.4 Cu-0.6 Mn alloy with different aging times is studied by using optical microscopy(OM),transmission electron microscopy(TEM),scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS).The results show that the microstructure of the Al-4.4 Cu-0.6 Mn alloy consists of anα(Al)matrix,intermittent reticulated Al-Cu intermetallic compound,rod-like Al-Ti compound and fine diffuse phases.The intermittent reticulated Al_(2)Cu,rod-shaped Al_(3)Ti,Ωphase and T(Al_(20)Cu_(2)Mn_(3)) phase are determined as the strengthening phases.The fracture mode of the alloy is primarily brittle fracture,with secondary ductile fracture in different aging times.
作者
詹肇麟
史东进
张帆
ZHAN Zhaolin;SHI Dongjin;ZHANG Fan(Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China)
出处
《昆明理工大学学报（自然科学版）》
北大核心
2022年第3期18-24,共7页
Journal of Kunming University of Science and Technology(Natural Science)
基金
国家自然科学基金项目(52161014)。
