工程科学学报，第41卷，第7期：914-921,2019年7月 Chinese Joural of Engineering,Vol.41,No.7:914-921,July 2019 D0L:10.13374/j.issn2095-9389.2019.07.010:htp:/journals.ustb.edu.cm 半连续铸造7136超高强铝合金的组织特征及均匀化 处理工艺 李佳乐)，周成)四，黄旭东)，张志豪)，吕丹) 1)北京科技大学材料科学与工程学院，北京1000832)北京科技大学新材料技术研究院，北京100083 3)东北轻合金有限责任公司，哈尔滨150060 ☒通信作者，E-mail:houc@usth.cd.cn 摘要以半连续铸造7136铝合金为研究对象，以铸态组织分析为基础，采用双级均匀化.结果表明：与其他7×××系铝合 金相比，7136铝合金铸态组织没有明显的层片状α(A1)+T共晶相的特征，也没有发现S相的存在.基体中的弥散相为微米 级的圆形或棒状Mg☑m,相，Mg元素和Zn元素随着液态合金的凝固，在A1基体中以Mg☑n,相的形式析出，为了平衡Mg元素 和Zm元素的分配系数，Mg元素和Zm元素从液态向固态迁移，这也是使得晶内Z元素和Mg元素偏高的原因.经过462℃， 24h单级均匀化.残留相大致消除.随着均匀化时间的延长，残留相有减少的趋势，但作用相对较小.经过450℃，24h+470 ℃，24h双级均匀化，差示扫描量热法获取的峰值非常小，晶间除了少量高熔点AL,Cu,Fe相残留，AL,Cu等其他相已基本消除， 均匀化效果显著 关键词7136超高强铝合金；半连续铸造；Mg☑2相：铸态组织；均匀化热处理 分类号TG142.71 Microstructure and homogenization process of semi-continuous casting 7136 ultra high- strength aluminum alloy LI Jia-le,ZHOU Chen',HUANG Xu-dong'),ZHANG Zhi-hao2),LU Dan) 1)School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China 2)Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China 3)Northeast Light Alloy Co.LTD,Harbin 150060.China Corresponding author,E-mail:zhouc@ustb.edu.cn ABSTRACT The 7 xxx series aluminum alloy is mainly produced using semi-continuous water-cooled casting with this method, the solidification speed of the alloy is fast,leading to different degrees of dendrite segregation and non-equilibrium eutectic structure in the ingot.This also results in non-uniformity of composition and structure.Further,it adversely affects the subsequent cutting process and comprehensive performance of the alloy.Therefore,ingot homogenization becomes an indispensable and very critical process for the elimination of segregation.There is much research on Al-Zn-Mg-Cu alloys at home and abroad at the present.This research mainly concentrates on alloys such as 7075,7050,7150 and 7055.The content of the main alloying elements of these alloys is mostly around 10%.However,at present,there is not much research on alloy materials with a strength and main alloying element content exceeding 12.5%.The main alloy element content of 7136 aluminum alloy is about 13.5%.In 7136 aluminum alloy,the main alloy element content is high and the cast microstructure characteristics and homogenization treatment conditions are very different from other 7 xxx series aluminum alloys.In this paper,semi-continuous casting 7136 aluminum alloy was taken as the research object,based on the as- 收稿日期：2018-06-27 基金项目：国家重点研发计划资助项目(2016YFB0300900):NSF℃-辽宁联合基金资助项目(U1708251):东北轻合金有限责任公司铝镁合金材 料院士工作站资助项目工程科学学报,第 41 卷,第 7 期:914鄄鄄921,2019 年 7 月 Chinese Journal of Engineering, Vol. 41, No. 7: 914鄄鄄921, July 2019 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2019. 07. 010; http: / / journals. ustb. edu. cn 半连续铸造 7136 超高强铝合金的组织特征及均匀化 处理工艺 李佳乐1) , 周 成1) 苣 , 黄旭东1) , 张志豪2) , 吕 丹3) 1)北京科技大学材料科学与工程学院, 北京 100083 2)北京科技大学新材料技术研究院, 北京 100083 3)东北轻合金有限责任公司, 哈尔滨 150060 苣通信作者, E鄄mail: zhouc@ ustb. edu. cn 摘 要 以半连续铸造 7136 铝合金为研究对象,以铸态组织分析为基础,采用双级均匀化. 结果表明:与其他 7 伊 伊 伊 系铝合 金相比,7136 铝合金铸态组织没有明显的层片状 琢(Al) + T 共晶相的特征,也没有发现 S 相的存在. 基体中的弥散相为微米 级的圆形或棒状 MgZn2 相,Mg 元素和 Zn 元素随着液态合金的凝固,在 Al 基体中以 MgZn2 相的形式析出,为了平衡 Mg 元素 和 Zn 元素的分配系数,Mg 元素和 Zn 元素从液态向固态迁移,这也是使得晶内 Zn 元素和 Mg 元素偏高的原因. 经过 462 益 , 24 h 单级均匀化,残留相大致消除. 随着均匀化时间的延长,残留相有减少的趋势,但作用相对较小. 经过 450 益 ,24 h + 470 益 ,24 h 双级均匀化,差示扫描量热法获取的峰值非常小,晶间除了少量高熔点 Al 7Cu2Fe 相残留,Al 2Cu 等其他相已基本消除, 均匀化效果显著. 关键词 7136 超高强铝合金; 半连续铸造; MgZn2 相; 铸态组织; 均匀化热处理 分类号 TG142郾 71 收稿日期: 2018鄄鄄06鄄鄄27 基金项目: 国家重点研发计划资助项目(2016YFB0300900);NSFC鄄鄄辽宁联合基金资助项目(U1708251);东北轻合金有限责任公司铝镁合金材 料院士工作站资助项目 Microstructure and homogenization process of semi鄄continuous casting 7136 ultra high鄄 strength aluminum alloy LI Jia鄄le 1) , ZHOU Chen 1) 苣 , HUANG Xu鄄dong 1) , ZHANG Zhi鄄hao 2) , L譈 Dan 3) 1) School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China 2) Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China 3) Northeast Light Alloy Co. LTD, Harbin 150060, China 苣Corresponding author, E鄄mail: zhouc@ ustb. edu. cn ABSTRACT The 7 伊 伊 伊 series aluminum alloy is mainly produced using semi鄄continuous water鄄cooled casting with this method, the solidification speed of the alloy is fast, leading to different degrees of dendrite segregation and non鄄equilibrium eutectic structure in the ingot. This also results in non鄄uniformity of composition and structure. Further, it adversely affects the subsequent cutting process and comprehensive performance of the alloy. Therefore, ingot homogenization becomes an indispensable and very critical process for the elimination of segregation. There is much research on Al鄄鄄Zn鄄鄄Mg鄄鄄Cu alloys at home and abroad at the present. This research mainly concentrates on alloys such as 7075, 7050, 7150 and 7055. The content of the main alloying elements of these alloys is mostly around 10% . However, at present, there is not much research on alloy materials with a strength and main alloying element content exceeding 12郾 5% . The main alloy element content of 7136 aluminum alloy is about 13郾 5% . In 7136 aluminum alloy, the main alloy element content is high and the cast microstructure characteristics and homogenization treatment conditions are very different from other 7 伊 伊 伊 series aluminum alloys. In this paper, semi鄄continuous casting 7136 aluminum alloy was taken as the research object, based on the as鄄