| Al-8.0Zn-2.0Mg-2.1Cu合金均匀化过程中Al2CuMg相的消除 |
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| 引用本文： | 朱鹏程,姜丽军,向康宁,黄杰,姚丹,余鑫祥.Al-8.0Zn-2.0Mg-2.1Cu合金均匀化过程中Al2CuMg相的消除[J].金属热处理,2020,45(5):40-44. |
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| 作者姓名： | 朱鹏程 姜丽军 向康宁 黄杰 姚丹 余鑫祥 |
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| 作者单位： | 1. 烟台南山学院 南山集团博士后工作站, 山东 烟台 265713;2. 烟台南山学院 先进轻合金材料与器件实验室, 山东 烟台 265713 |
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| 基金项目： | 龙口市科技研发计划项目;高等学校科技计划 |
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| 摘 要： | 采用光学显微镜(OM)、扫描电镜(SEM)、电子探针显微分析(EPMA)、X射线衍射(XRD)以及差示扫描量热仪(DSC)研究了一种高合金化Al-8.0Zn-2.0Mg-2.1Cu(wt%)合金在均匀化过程中难溶相Al2CuMg的形成以及实现其充分溶解的工艺。结果表明:铸态时,合金中主要的非平衡凝固相为Mg(Zn, Al, Cu)2相,Zn、Mg、Cu元素偏聚严重。经过470 ℃×40 h一级均匀化后,虽然Mg(Zn, Al, Cu)2相逐渐回溶至基体中促进了合金中枝晶网络的基本消除,但合金中形成了一种耐高温的有害相Al2CuMg。进一步采用485 ℃×14 h的高温均匀化工艺实现了合金中耐高温相Al2CuMg的充分回溶。扩散动力学分析表明,470 ℃×40 h+485 ℃×14 h的双级均匀化工艺足以使合金中的非平衡相回溶至基体中。
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| 关 键 词： | Al-Zn-Mg-Cu合金 均匀化 相转变 微观组织 |
| 收稿时间： | 2019-10-14 |
Elimination of Al2CuMg phase during homogenization in Al-8.0Zn-2.0Mg-2.1Cu alloy |
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| Zhu Pengcheng,Jiang Lijun,Xiang Kangning,Huang Jie,Yao Dan,Yu Xinxiang.Elimination of Al2CuMg phase during homogenization in Al-8.0Zn-2.0Mg-2.1Cu alloy[J].Heat Treatment of Metals,2020,45(5):40-44. |
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| Authors: | Zhu Pengcheng Jiang Lijun Xiang Kangning Huang Jie Yao Dan Yu Xinxiang |
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| Affiliation: | 1. Postdoctoral Workstation of Nanshan Group Co., Ltd., Yantai Nanshan University, Yantai Shandong 265713, China;2. Laboratory of Advanced Light Alloy Materials and Devices, Yantai Nanshan University, Yantai Shandong 265713, China |
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| Abstract: | The formation of the insoluble phase Al2CuMg in a highly alloyed Al-8.0Zn-2.0Mg-2.1Cu (wt%) alloy during homogenization and the process of its full dissolution were studied by means of OM、SEM、EPMA、XRD and DSC. The results show that the main non-equilibrium solidification phase in as-cast alloy is Mg (Zn, Al, Cu)2 phase, and the elements of Zn, Mg and Cu are segregated seriously. After primary homogenization of heating at 470 ℃ for 40 h, although Mg (Zn, Al, Cu)2 phase gradually is dissolved back into the matrix and promotes the elimination of dendritic network in the alloy, a harmful phase Al2CuMg with high temperature stablity is formed in the alloy. Furthermore, the high temperature homogenization process of heating at 485 ℃ for 14 h is used to realize the full dissolution of the high temperature stable phase Al2CuMg. The proper homogenization processing is heating at 470 ℃ for 40 h and 485 ℃ for 14 h, which is consistent with the results of homogenizing kinetic analysis. |
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| Keywords: | Al-Zn-Mg-Cu alloy homogenization phase transformation microstructure |
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