熔铸工艺对2618铝合金中难溶相尺寸与分布的影响  

Effect of Melting and Casting Process on Size and Distribution of Insoluble Phase in Aluminum Alloy 2618

作　　者：朱振宇 涂浩 吴长军[1,2] 彭浩平 王建华[1,2] 苏旭平 ZHU Zhenyu;TU Hao;WU Changjun;PENG Haoping;WANG Jianhua;SU Xuping(Jiangsu Key Laboratory of Surface Science and Technology,School of Materials Science and Engineering,Changzhou University,Changzhou 213164,China;Jiangsu Collaborative Innovation Center for Photovoltaic Science and Engineering,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州大学材料科学与工程学院,江苏省表面科学与技术重点实验室,常州213164 [2]常州大学江苏省光伏科学与工程协同创新中心,常州213164

出　　处：《材料导报》2021年第4期4129-4133,共5页Materials Reports

基　　金：国家自然科学基金(51074030)。

摘　　要：为了细化2618铝合金中难溶相并改善其分布,采用光学显微镜、扫描电镜和X射线衍射仪等手段,研究了熔体保温时间、双液混合熔炼工艺和铸型温度对2618铝合金中难溶相尺寸与分布的影响。结果表明:适当延长保温时间,不仅可使Al9FeNi相形态由粗大针片状变为细小针片状,还可使Al9FeNi相和Al7Cu2Fe相的分布更加均匀。采用双液混合熔炼工艺可使2618铝合金中Al9FeNi相变成细小的针片状,且使Al9 FeNi相和Al7Cu2Fe相非常均匀地分布于基体组织。将2618铝合金液浇注到室温金属型中进行快速凝固,可得到均匀分布的细小难溶相。随着铸型温度的升高,合金组织中的难溶相明显粗化,并出现明显的聚集现象。In order to refine the undissolved phases in aluminum alloy 2618 and improve their distribution state, the effect of melt holding time and double liquid mixing process as well as mold temperature on the size and distribution of insoluble phases was investigated by means of optical microscope, scanning electron microscope and X-ray diffractometer. The results show that the proper increase of holding time not only changes the morphology of Al9FeNi from coarse needle to fine needle, but also increases the uniformity of Al9FeNi phase and Al7Cu2Fe phase. The double liquid mixing process could make the morphology of Al9FeNi phase in alloy 2618 changed into fine needle-like. Besides, Al9FeNi and Al7Cu2Fe phases are distributed very uniformly in the matrix of alloy 2618. After the melt of aluminum alloy 2618 is poured into metal mold at room temperature, the fine and uniform distribution of insoluble phases in alloy 2618 could be obtained due to rapid solidification. As the increase of the mold temperature, the size of the insoluble phases in the alloy increases and the aggregation occurs.

关 键 词：2618铝合金 难溶相 熔炼工艺 铸型温度 

分 类 号：TG292[金属学及工艺—铸造]