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

doi:10.11868/j.issn.1001-4381.2016.09.011

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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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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 words： Mg 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

基金资助:河北省自然科学基金资助项目(E2013402056);河北省高等学校科学技术研究项目(QN2014002);河北省研究生创新资助项目(16129026)

通讯作者: 刘晓艳 E-mail: x918y@126.com

作者简介: 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

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.
Xiao-yan LIU, Zhao-peng WANG, Liang LONG, Xi-liang ZHANG, Hao-xuan CUI, Fei GAO. 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.

链接本文:

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

Table 1 Al-Cu-Mg-Ag合金的名义化学成分

Fig.1 不同Mg含量Al-Cu-Mg-Ag合金的时效硬化曲线

Fig.2 不同Ag含量Al-Cu-Mg-Ag合金的时效硬化曲线

Fig.3 不同Mg含量峰时效态Al-Cu-Mg-Ag合金的TEM照片(a)0.4%Mg; (b)0.8%Mg; (c)1.2%Mg, 晶界; (d)1.2%Mg, 晶内

Fig.4 不同Ag含量峰时效态Al-Cu-Mg-Ag合金的TEM照片(a)0.2%Ag沿〈110〉_α; (b)0.2%Ag沿〈100〉_α; (c)0.5%Ag沿〈100〉_α; (d)0.8%Ag沿〈110〉_α; (e)0.2%Ag, 晶界; (f)0.8%Ag, 晶界

Fig.5 Al-Cu-Mg-Ag合金晶间腐蚀截面高倍(1)与低倍(2)照片(a)合金1;(b)合金2;(c)合金3;(d)合金4;(e)合金5

Table 2 Al-Cu-Mg-Ag合金晶间腐蚀结果

Fig.6 不同Mg含量Al-Cu-Mg-Ag合金的极化曲线

Fig.7 不同Ag含量Al-Cu-Mg-Ag合金的极化曲线

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