Cu含量對(duì)2219鋁合金鍛件及其焊接接頭組織與性能的影響

Cu含量對(duì)2219鋁合金鍛件及其焊接接頭組織與性能的影響Effect of Cu Content on Microstructure and Properties of 2219 Aluminum Alloy Forgings and Its Welded Joints

采用力學(xué)拉伸實(shí)驗(yàn)、焊接實(shí)驗(yàn)、電化學(xué)阻抗譜（EIS）、循環(huán)陽(yáng)極極化曲線（Tafel）以及金相和掃描電鏡（SEM）等分析測(cè)試方法，研究Cu含量對(duì)2219鋁合金鍛件組織與性能的影響。結(jié)果表明：降低Cu含量，有利于減少2219鋁合金基體內(nèi)的殘余結(jié)晶相，并有效抑制在合金焊接過(guò)程中粗大Al2Cu相的析出，使基材和焊件的伸長(zhǎng)率顯著提高，強(qiáng)度略有下降；Cu在鋁基體中形成Al2Cu相誘導(dǎo)合金發(fā)生局部腐蝕，使材料的耐腐蝕性能變差，降低Cu含量能夠減小合金的腐蝕傾向，改善合金的耐腐蝕性能。

The influence of Cu content on microstructure and properties of 2219 aluminum alloy was investigated by using tensile tests, welding tests, electrochemical impedance spectroscopy (EIS), cyclic anodic polarization curves (Tafel) combined with optical microscopy (OM) and scanning electron microscopy analysis (SEM). The results indicate that the residual crystal phase in the matrix of 2219 aluminum alloy is reduced with the decrease of Cu content which contributed to effectively suppress the precipitation of Al2Cu coarse phase during the welding process. Furthermore, with the decrease of Cu content, elongation of the alloy is significantly increased, while the tensile strength and yield strength is slightly decreased. At the same time, Al2Cu phase formed in the matrix induces localized corrosion which causes the deterioration of corrosion resistance in the alloy, while the corrosion tendency of the alloy can be reduced by the decrease of Cu content and the corrosion resistance of the alloy is improved.

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