Effect of Sc and Zr Additions on Recrystallization Behavior and Intergranular Corrosion Resistance of Al-Zn-Mg-Cu Alloys

被引：17

作者：

Xia, Peng ^{[1
,2
]}

Wang, Shuncheng ^{[3
]}

Huang, Huilan ^{[1
,2
]}

Zhou, Nan ^{[1
,2
]}

Song, Dongfu ^{[1
,2
]}

Jia, Yiwang ^{[1
,2
]}

机构：

[1] Guangdong Acad Sci, Inst New Mat, Guangzhou 510650, Peoples R China

[2] Guangdong Acad Sci, Inst New Mat, Guangdong Prov Key Lab Met Toughening Technol & A, Guangzhou 510650, Peoples R China

[3] Guangdong Xingfa Aluminum Co Ltd, Foshan 528137, Peoples R China

来源：

MATERIALS | 2021年 / 14卷 / 19期

基金：

中国国家自然科学基金;

关键词：

Al-Zn-Mg-Cu alloy; recrystallization; intergranular corrosion; scandium; MECHANICAL-PROPERTIES; ALUMINUM-ALLOY; MICROALLOYING ADDITIONS; LOCALIZED CORROSION; HEAT-TREATMENT; MINOR SC; MICROSTRUCTURE; CRACKING; EVOLUTION; HOMOGENIZATION;

D O I：

10.3390/ma14195516

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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-3(Sc1-xZrx) 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 Al3Zr 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-3(Sc1-xZrx) phase promotes recrystallization due to particle-stimulated nucleation (PSN), and acts as the cathode to stimulate an accelerated electrochemical process between the primary Al-3(Sc1-xZrx) particles and GBPs, resulting in a sharp decrease of the corrosion resistance in the surface layer of Al-Zn-Mg-Cu-Sc-Zr alloy.

引用

页数：19

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