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材料工程  2016, Vol. 44 Issue (9): 68-75    DOI: 10.11868/j.issn.1001-4381.2016.09.011
  材料与工艺 本期目录 | 过刊浏览 | 高级检索 |
Mg与Ag含量对Al-Cu-Mg-Ag新型耐热铝合金晶间腐蚀性能的影响
刘晓艳, 王召朋, 龙亮, 张喜亮, 崔好选, 高飞
河北工程大学 装备制造学院, 河北 邯郸 056038
Effects of Mg and Ag Contents on Intergranular Corrosion Property of Al-Cu-Mg-Ag New Heat-resistant Al Alloy
LIU Xiao-yan, WANG Zhao-peng, LONG Liang, ZHANG Xi-liang, CUI Hao-xuan, GAO Fei
Equipment Manufacturing College, Hebei University of Engineering, Handan 056038, Hebei, China
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摘要 采用晶间腐蚀性能测试研究Mg与Ag含量对Al-Cu-Mg-Ag合金抗腐蚀性能的影响,结合透射电子显微分析技术与电化学分析技术等探讨了不同成分合金的晶间腐蚀机理。结果表明:增加Mg与Ag含量能够提高合金的时效硬化速率。随Mg含量的增加,强化相Ω相尺寸逐渐减小,体积分数逐渐增大,晶界析出相增多,无沉淀析出带(PFZ)中溶质原子减少,PFZ与基体的电位差增大,合金的抗晶间腐蚀能力逐渐降低。随Ag含量的增加,合金中的强化相由大量的θ'相和少量的Ω相,逐渐转变为大量的Ω相和少量的θ'相。Ag含量的改变对PFZ的电位差影响不大,合金的耐蚀性主要取决于PFZ的宽度。增加Ag含量能够细化晶界析出相,减小PFZ宽度,腐蚀通道变窄,合金的抗晶间腐蚀性能得到提高。
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刘晓艳
王召朋
龙亮
张喜亮
崔好选
高飞
关键词 Mg含量Ag含量Al-Cu-Mg-Ag晶间腐蚀无沉淀析出带    
Abstract:The effects of Mg and Ag contents on the corrosion resistance of Al-Cu-Mg-Ag alloy were investigated by intergranular corrosion (IGC) testing. The corrosion mechanism of the alloys with different chemical composition was discussed by transmission electron microscopy (TEM) and electrochemical analyses. The results indicate with increasing Mg and Ag content, the age hardening rate of the alloy increases. The size of the strengthening phases Ω decreases with increasing Mg content whereas phase volume fraction increases. More solution atoms are consumed to form the precipitation on the grain boundaries of the alloy with higher Mg content, which increases the potential difference between precipitation free zone (PFZ) and the matrix and subsequently, the IGC resistance of Al-Cu-Mg-Ag alloy decreases. Increasing the Ag content, the main strengthening phases transform from great amounts of θ' with less Ω to plentiful Ω with less θ'. The variation of Ag content hardly affects the potential of PFZ, and the corrosion resistance of the alloy depends mainly on the width of PFZ. With increasing Ag content, the precipitations on the grain boundaries are refined; the width of PFZ decreases and correspondingly, the corrosion passageway becomes narrow. The IGC resistance of Al-Cu-Mg-Ag alloy is enhanced with increasing Ag content.
Key wordsMg content    Ag content    Al-Cu-Mg-Ag    intergranular corrosion    precipitation free zone
收稿日期: 2016-02-22      出版日期: 2016-09-27
中图分类号:  TG174.3  
通讯作者: 刘晓艳(1980-),女,博士,副教授,主要从事高性能铝合金与金属表面处理研究,联系地址:河北省邯郸市光明南大街199号河北工程大学装备制造学院(056038),E-mail:x918y@126.com     E-mail: x918y@126.com
引用本文:   
刘晓艳, 王召朋, 龙亮, 张喜亮, 崔好选, 高飞. Mg与Ag含量对Al-Cu-Mg-Ag新型耐热铝合金晶间腐蚀性能的影响[J]. 材料工程, 2016, 44(9): 68-75.
LIU Xiao-yan, WANG Zhao-peng, LONG Liang, ZHANG Xi-liang, CUI Hao-xuan, GAO Fei. Effects of Mg and Ag Contents on Intergranular Corrosion Property of Al-Cu-Mg-Ag New Heat-resistant Al Alloy. Journal of Materials Engineering, 2016, 44(9): 68-75.
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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.09.011      或      http://jme.biam.ac.cn/CN/Y2016/V44/I9/68
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