新聞資訊
AA7075鋁合金應力腐蝕開裂過程中裂紋萌生和發展的電化學噪聲
發布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-12-31
基于恒應變的C型環測試裝置，采用電化學噪聲(ECN)研究恒應變條件下AA7075高強鋁合金在3%NaCl (質量分數)溶液中裂紋的萌生及發展過程。
AA7075鋁合金應力腐蝕開裂過程中裂紋萌生和發展的電化學噪聲Electrochemical noise of crack initiation and propagation of AA7075 aluminium alloy during stress corrosion cracking
基于恒應變的C型環測試裝置，采用電化學噪聲(ECN)研究恒應變條件下AA7075高強鋁合金在3%NaCl (質量分數)溶液中裂紋的萌生及發展過程。結果表明：伴隨著裂紋的萌生和發展，出現明顯的周期性電流與電位噪聲峰，且這些噪聲峰的出現頻率和時間與3D顯微鏡所觀測到的C型環試樣表面裂紋的萌生與長大具有良好的一致性；裂紋的萌生與成長并不是連續發生的，而是表現出明顯的階段性；恒應變試驗后期，隨著C型環的應力松弛，裂紋的縱深延展幾乎停止，但仍然可以捕捉到密集的短時電流噪聲峰，這些噪聲峰可能與裂紋側壁的亞穩態點蝕生長過程有關。
The initiation and propagation process of stress corrosion cracking of AA7075 high strength aluminium alloy were investigated by electrochemical noise in 3%NaCl (mass fraction) solution by a constant strain test device. The results show that the propagation of cracks can produce the intensive and regular potential and current noise peaks. In addition, the beginning time and frequency of noise peaks are consistent with the initiation and growth process of cracks via online 3D microscope observation. By the shape and lifespan analysis of noise peaks, the advance of cracks is an intermittent process obviously. The deepening process of crack is almost inhibited due to the relaxation of stress on the C-ring specimen. Meanwhile, the dense short-time noise peaks can be observed, which is possibly induced by the metastable pit corrosion along the crack mouth.
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