锌镁比对Al-Zn-Mg-Cu-Er-Sc-Zr合金显微组织与耐腐蚀性能影响的研究
Effects of Zn/Mg Ratio on Microstructure and Corrosion Resistance of Al-Zn-Mg-Cu-Er-Sc-Zr Alloy
王少华 1武晓辉 2梁爽 1邢清源 1孟令刚 2张兴国2
作者信息
- 1. 中国航发北京航空材料研究院,北京 100095
- 2. 大连理工大学 材料科学与工程学院,辽宁 大连 116024
- 折叠
摘要
通过调整Al-Zn-Mg-Cu-Er-Sc-Zr合金中的Mg元素含量,研究了Zn/Mg比的变化对合金相演变以及腐蚀性能的影响规律.结果表明:Al8Cu4Er相、Al3(Er,Sc)相与含Fe相存在明显的伴生关系,二者依附于含Fe相生长.Zn/Mg比的变化可显著改变三者间的交互形式,高的Zn/Mg比例有利于稀土相独立生长,且在比值为 4.18 的条件下,Al8Cu4Er相与含Fe相均得到了显著细化.细化的晶界第二相使腐蚀坑深度仅为 82 μm,而连续的伴生混合相、粗大稀土相等均会不同程度降低合金的耐蚀性能.
Abstract
By adjusting Mg element content in Al-Zn-Mg-Cu-Er-Sc-Zr alloy,the influence of the change of the Zn/Mg ratio on the phase evolution and corrosion performance of the alloy was studied.The results show that Al8Cu4Er phase,Al3(Er,Sc)phase and Fe-containing phase have an obvious concomitant relationship,and they both depend on the Fe-containing phase to grow.The change of the Zn/Mg ratio can significantly change the interaction between the three.A high Zn/Mg ratio is conducive to the independent growth of the rare earth phase,and under the condition of the ratio of 4.18,the Al8Cu4Er phase and Fe-containing phase significantly refine.The refined grain boundary second phase makes the corrosion pit depth only 82 μm,while the continuous associated mixed phase and coarse rare earth reduce the corrosion resistance of the alloy to different degrees.
关键词
Al-Zn-Mg-Cu-Er-Sc-Zr铝合金/Zn/Mg比/稀土相/晶间腐蚀Key words
Al-Zn-Mg-Cu-Er-Sc-Zr aluminum alloy/Zn/Mg ratio/rare earth phase/intergranular corrosion引用本文复制引用
出版年
2024
NETL
NSTL
万方数据