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| 分级均匀化处理对7068新型高强铝合金组织及性能的影响 | |
| 引用本文： | 张志,陈忠家,姚奇,蒙广建. 分级均匀化处理对7068新型高强铝合金组织及性能的影响[J]. 有色金属加工, 2014, 0(5): 13-17 |
| 作者姓名： | 张志 陈忠家 姚奇 蒙广建 |
| 作者单位： | 合肥工业大学材料科学与工程学院,安徽合肥,230009 |
| 基金项目： | 国家自然科学基金重点项目（51135004） |
| 摘 要： | 采用光学显微镜(OM)、扫描电子显微镜(SEM)、能谱分析(EDS)及差热分析(DSC)研究了7068高强高韧铝合金均匀化热处理制度及其微观组织演变;通过单向拉伸试验及四探针电阻率法测定了不同均匀化后T6态合金的拉伸性能及电导率。结果表明:7068铝合金铸态组织存在枝晶偏析,非平衡共晶相沿晶界呈连续网状分布,低熔点共晶相初始溶解温度为467.3°C;合金经455°C×16h+465°C×4h+475°C×4h三级均匀化处理后,成分均匀,残留共晶很少且T6态的抗拉强度、延伸率以及电导率均达到所做均匀化处理中最佳,分别为715MPa、13.3%和34.5%IACS。 |
| 关 键 词： | 铝合金 均匀化热处理 微观组织 力学性能 |
Effect of Three-step Homogenization on Microstructure and Mechanical Properties of 7068 Aluminum Alloy |
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| ZHANG Zhi,CHEN Zhongjia,YAO Qi,MENG Guangjian. Effect of Three-step Homogenization on Microstructure and Mechanical Properties of 7068 Aluminum Alloy[J]. Nonferrous Metals Processing, 2014, 0(5): 13-17 | |
| Authors: | ZHANG Zhi CHEN Zhongjia YAO Qi MENG Guangjian |
| Affiliation: | ( School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China) |
| Abstract: | The paper presented the effect of homogenization heat treatment on microstructure of 7068 aluminum al oy using OM,SEM-EDS and DSC;it highlighted tensile properties and conductivity of the al oy in the T6 state after three-step homogenization. The results indicated that before homogenization：dendritic segregation in as-cast microstructure, nonequilibrium eutectic phase distribution along the grain boundary,467.3℃for initial temperature of eutectic phase dissolution;after the homogenization processes of 455℃×16h＋465℃×4h＋475℃×4h：uniform in composition,tiny eutectic structures;the tensile strength,elongation and conductivity respectively reached 715MPa,13.3% and 34.5%IACS,an optimal state in homogenization . |
| Keywords: | 7068 aluminum al oy homogenization heat treatment microstructure mechanical properties |
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