Xia Peng, Wang Shuncheng, Huang Huilan, Zhou Nan, Song Dongfu, Jia Yiwang
Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510650, China.
Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510650, China.
Materials (Basel). 2021 Sep 23;14(19):5516. doi: 10.3390/ma14195516.
The recrystallization and intergranular corrosion behaviors impacted by the additions of Sc and Zr in Al-Zn-Mg-Cu alloys are investigated. The stronger effect of coherent Al(ScZr) phases on pinning dislocation resulted in a lower degree of recrystallization in Al-Zn-Mg-Cu-Sc-Zr alloy, while the subgrain boundaries can escape from the pinning of AlZr phases and merge with each other, bringing about a higher degree of recrystallization in Al-Zn-Mg-Cu-Zr alloy. A low degree of recrystallization promotes the precipitation of grain boundary precipitates (GBPs) with a discontinuous distribution, contributing to the high corrosion resistance of Al-Zn-Mg-Cu-Sc-Zr alloy in the central layer. The primary Al(ScZr) phase promotes recrystallization due to particle-stimulated nucleation (PSN), and acts as the cathode to stimulate an accelerated electrochemical process between the primary Al(ScZr) particles and GBPs, resulting in a sharp decrease of the corrosion resistance in the surface layer of Al-Zn-Mg-Cu-Sc-Zr alloy.
研究了Sc和Zr的添加对Al-Zn-Mg-Cu合金再结晶和晶间腐蚀行为的影响。共格Al(ScZr)相钉扎位错的作用更强，导致Al-Zn-Mg-Cu-Sc-Zr合金的再结晶程度较低，而亚晶界能够从AlZr相的钉扎中逸出并相互合并，使得Al-Zn-Mg-Cu-Zr合金的再结晶程度较高。低再结晶程度促进了具有不连续分布的晶界析出相（GBPs）的析出，这有助于Al-Zn-Mg-Cu-Sc-Zr合金中间层具有高耐蚀性。初生Al(ScZr)相由于粒子激发形核（PSN）促进再结晶，并作为阴极促进初生Al(ScZr)粒子与GBPs之间的加速电化学过程，导致Al-Zn-Mg-Cu-Sc-Zr合金表层耐蚀性急剧下降。
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