大尺寸Al-Zn-Mg-Cu铝合金铸锭均匀化工艺研究  

Investigation on Homogenization Process of Large Size of Al-Zn-Mg-CuAluminum Alloy Ingot

作　　者：晁代义 李昌龙 赵佳蕾 孙有政 赵志国 霍艳 吕正风 CHAO Daiyi;LI Changlong;ZHAO Jialei;SUN Youzheng;ZHAO Zhiguo;HUO Yan;LYU Zhengfeng(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338-340,共3页Materials Reports

摘　　要：为了解决生产过程中大尺寸Al-Zn-Mg-Cu合金铸锭的均匀化问题,利用金相分析、热分析、扫描电镜和透射电镜观察等方法,研究了不同均匀化工艺对Al-Zn-Mg-Cu合金超大铸锭组织及过烧现象的影响。研究结果表明:合金铸锭在420℃均匀化4 h后,基体中析出了大量弥散分布的Al 3Zr相,继续提高温度,合金铸锭在475℃均匀化时发生了过烧现象。经470℃/8 h均匀化后合金的低熔点峰值向高温方向移动,枝晶组织以及富Zn、Mg相基本消失,能谱显示残留第二相主要由富Cu、Mg相和富Cu、Fe相组成,过烧温度达到480℃。为进一步减少富Cu、Mg相的影响,继续提高温度到478℃时,未发现过烧现象,第二相含量进一步减少。本研究确定了Al-Zn-Mg-Cu合金超大铸锭的均匀化温度为420℃/4 h+470℃/8 h+478℃/12 h,此时铸锭未出现过烧现象,第二相含量明显减少。In order to solve the homogenization issues of the large size Al-Zn-Mg-Cu alloy ingot,the effect of homogenization process on the microstructure and over-burning of Al-Zn-Mg-Cu alloy large ingot was studied by using OM,DSC,SEM and TEM analysis methods.The results showed that:a large number of dispersed Al 3Zr phase was precipitated in the matrix after homogenized at 420℃for 4 h,while the ingot was over-burned after increasing the temperature up to 475℃.After the alloy was homogenized at 470℃/8 h,the peak of the low melting point of the alloy moved to the high temperature direction,the dendritic structure in the alloy basically disappeared,and the Zn-rich and Mg-rich phases disappeared,the EDS test showed that the alloy mainly consisted of Cu-rich,Mg-rich and Cu-rich and Fe phases,and the over-burning temperature reached 480℃.In order to further reduce the influence of Cu-rich and Mg-rich phases,the temperature was further increased to 478℃on the basis of 470℃homogenization,no over-burning was found and the content of the second phase was further reduced.In this paper,the homogenization tempe-rature of Al-Zn-Mg-Cu alloy large ingots was determined to be 420℃/4 h+470℃/8 h+478℃/12 h,at this time the ingot had no over-burned and the second phase content decreased obviously.

关 键 词：AL-ZN-MG-CU铝合金 均匀化工艺 铸锭 过烧 

分 类 号：TG142.71[一般工业技术—材料科学与工程]