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微量Zn對Al-4.2Cu-1.4Mg合金應(yīng)力腐蝕與微觀組織的影響
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Effect of Trace Zn on Stress Corrosion Resistance and Microstructure of Al-4.2Cu-1.4Mg Alloy
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    通過慢應(yīng)變速率拉伸、動(dòng)電位極化曲線測試、透射電子顯微分析(TEM)、背散射電子衍射(EBSD)等實(shí)驗(yàn)較系統(tǒng)地研究了微量Zn對Al-4.2Cu-1.4Mg合金應(yīng)力腐蝕與微觀組織的影響規(guī)律。結(jié)果表明，微量Zn的添加顯著影響合金的腐蝕性能，且隨著Zn含量增加，合金的抗應(yīng)力腐蝕敏感性以及其對應(yīng)的開路電位均呈峰值變化，含Zn量0.29%合金的抗腐蝕能力最佳。EBSD研究表明，含0.29%Zn的Al-4.2Cu-1.4Mg合金與其它合金相比存在較多的低能量小角度晶界，這可能是微量Zn顯著影響該合金抗應(yīng)力腐蝕性能的主要原因

    Abstract:

    The effect of trace addition of Zn on the stress corrosion cracking (SCC) resistance and microstructure of Al-4.2Cu-1.4Mg alloy was studied by means of the slow strain rate technique (SSRT), potentiodynamic polarization test, transmission electron microscopy (TEM) and electron back scattered diffraction (EBSD). The results show that the stress corrosion cracking resistance is improved at the beginning and then decreased with the increase of Zn content. The optimum amount of Zn addition is 0.29% to improve SCC resistance. EBSD results show that there are much more low-angle grain boundaries with low energy in the 0.29% Zn contained alloy, which is probably the main reason why Zn can significantly influence SCC resistance of the alloy

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楊文玲,陳志國,黃裕金,周 嫻,胡 煒.微量Zn對Al-4.2Cu-1.4Mg合金應(yīng)力腐蝕與微觀組織的影響[J].稀有金屬材料與工程,2011,40(7):1206~1210.[Yang Wenling, Chen Zhiguo, Huang Yujin, Zhou Xian, Hu Wei. Effect of Trace Zn on Stress Corrosion Resistance and Microstructure of Al-4.2Cu-1.4Mg Alloy[J]. Rare Metal Materials and Engineering,2011,40(7):1206~1210.]
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  • 收稿日期:2010-07-05
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