铸造Al-4.4Cu-0.6Mn高强铝合金增强相及断裂特性的研究  

Strengthening Phases and Fracture Mechanism of Cast Al-4.4Cu-0.6Mn Alloy

作　　者：詹肇麟[1] 史东进 张帆[1] ZHAN Zhaolin;SHI Dongjin;ZHANG Fan(Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093

出　　处：《昆明理工大学学报（自然科学版）》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)。

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.

关 键 词：AL-CU-MN合金 时效 显微组织 强化相 断裂机制 

分 类 号：TG146.21[一般工业技术—材料科学与工程]