Current-driving intergranular corrosion performance regeneration below the precipitates solvus temperature in Al–Mg alloy
Current-driving intergranular corrosion performance regeneration below the precipitates solvus temperature in Al–Mg alloy
复制标题
DOI：
10.1016/j.jmst.2020.01.071
复制
发表时间：
2020-09
影响因子：
10.9
通讯作者：
Di Zhang;Z. Zhang;Yanlin Pan;Yanbin Jiang;L. Zhuang;Ji-shan Zhang;Xinfang Zhang
中科院分区：
文献类型：
--
作者：
Di Zhang;Z. Zhang;Yanlin Pan;Yanbin Jiang;L. Zhuang;Ji-shan Zhang;Xinfang Zhang
热处理是提高敏化Al-Mg合金抗晶间腐蚀性能的有效方法，其原因是晶界析出相在β相固溶线温度以上溶解。固溶线温度以下，晶界析出物长大并粗化。本研究采用低于β相固溶线温度的低密度电脉冲处理，实现了敏化Al-Mg合金晶间腐蚀性能的原位再生。我们的研究结果表明，通过电脉冲处理的晶界析出相的溶解是在相对较低的温度相比，传统的热处理加速。在β相固溶线温度以下，原子与电子相互作用对晶界析出相溶解产生的非热效应是提高耐蚀性的主要原因。
Heat treatment is an effective method to improve the intergranular corrosion resistance of the sensitized Al–Mg alloy due to dissolution of the grain boundary precipitates above the solvus temperature of β-phase. The grain boundary precipitates will grow and coarsening below the solvus temperature. In this study, the in-situ intergranular corrosion performance regeneration of the sensitized Al–Mg alloy can be realized by low-density electro-pulsing treatment below the solvus temperature of β-phase. Our findings show that the dissolution of grain boundary precipitates by electro-pulsing treatment is accelerated at relatively low temperature in comparison to traditional heat treatment. The athermal effect produced by the interaction between atoms and electrons on the dissolution of grain boundary precipitates is the main reason for the improved corrosion resistance below the solvus temperature of β-phase.