大尺寸Al-Cu-Mg-Mn合金铸锭均匀化工艺研究  

Study on Homogenization Process of Large Size Al-Cu-Mg-Mn Alloy Ingot

作　　者：黄同瑊 秦宇 晁代义 王志雄 宋晓霖 张华 程仁策 HUANG Tongjian;QIN Yu;CHAO Daiyi;WANG Zhixiong;SONG Xiaolin;ZHANG Hua;CHENG Rence(Shandong Nanshan Aluminum Co.,Ltd.,Longkou 265713,China;National Engineering Research Center for Plastic Working of Aluminium Alloys,Longkou 265713,China)

机构地区：[1]山东南山铝业股份有限公司,龙口265713 [2]国家铝合金压力加工工程技术研究中心,龙口265713

出　　处：《材料导报》2020年第S01期325-327,共3页Materials Reports

摘　　要：本工作通过金相、DSC、SEM等手段研究了均匀化工艺对大尺寸Al-Cu-Mg合金扁锭的组织演变和力学性能的影响。研究结果表明,铸态合金中枝晶偏析从芯部区域到边部区域越来越严重,晶界分布大量的块状A 2Cu相和Al 2CuMg相。采用接近低熔点共晶融化温度进行均匀化退火后,选择合适的均匀化时间使得合金中的枝晶偏析基本消除,晶内成分分布较为均匀。经500℃/36 h均匀化后,残留第二相含量为0.88%,经过轧制变形后的薄板T42态的抗拉强度达到480 MPa,屈服强度达到327 MPa,延伸率为19%.The microstructure evolution and property of large size Al-Cu-Mg-Mn alloy ingot during different homogenization were studied by optical microscopy(OM),differential scanning calorimetry(DSC)and scanning electron microscopy(SEM).The results showed that the dendrite segregation in the as-cast alloy was more serious from the core region to the edge region.Near the low melting point homogenizing annealing and the proper time of homogenization was selected,which lead to the dendrite segregation was basically eliminated and the distribution of components was relatively uniform.Homogenization at 500℃/36 h,the residual second phase content was 0.88%.After the rolling deformation,the T42-state tensile strength of the alloy reached 480 MPa,the yield strength reached 327 MPa,and the elongation reached 19%.

关 键 词：大尺寸Al-Cu-Mg合金 均匀化退火 成分均匀 抗拉强度 

分 类 号：TG142.71[一般工业技术—材料科学与工程]