摘要
以自制的Al-Zn-Mg-Cu-Er-Sc-Zr铝合金为基础,通过调整主元素Zn、Mg、Cu的含量研究了三者与外加微量Er元素交互作用下的合金组织演变过程及其对合金腐蚀性能的影响。研究结果表明:Cu的加入可与Er在晶界形成大量的颗粒状AlCuEr相,而Zn、Mg含量的增加可使颗粒状AlCuEr相转变为粗大块状相。颗粒状AlCuEr相具有更高的耐腐蚀性能,其点蚀坑深度明显低于无Cu合金的残余相,且无晶间腐蚀发生。Cu元素的加入将大量Er元素固定于晶界,影响了合金在不同状态下的抗剥落腐蚀性能。
In the present work, based on the self-made Al-Zn-Mg-Cu-Er-Sc-Zr aluminum alloy, the microstructure evolution process of the alloy under the interaction of the three elements, the external trace Er element and its effect on the corrosion performance of the alloy were studied by adjusting the content of the main elements Zn, Mg, and Cu. The results showed that the addition of the Cu formed a large number of granular AlCuEr phases with Er at the grain boundaries, and the increase of the Zn and Mg contents could transform the granular phase into a coarse bulk phase. The granular AlCuEr phase had higher corrosion resistance,and its pitting pit depth was significantly lower than that of the residual phase of the Cu-free alloy, and no intergranular corrosion occur. The addition of the Cu element fixed a large amount of Er element on the grain boundary, which affected the exfoliation performance of the alloy in different states.
作者
王少华
汤中英
武晓辉
邢清源
孟令刚
张兴国
WANG Shao-hua;TANG Zhong-ying;WU Xiao-hui;XING Qing-yuan;MENG Ling-gang;ZHANGXing-guo(AECC Beijing institute of aeronautical materials,Beijing 100095,China;School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China)
出处
《铸造》
CAS
北大核心
2022年第10期1245-1250,共6页
Foundry
