Enhancing the intergranular corrosion resistance and mechanical properties of Al–Mg–xSi–Cu–Zn alloys by synergistic intergranular and intragranular precipitation behaviors

Journal article (2022)

Authors

Liang Zhu University of Science and Technology Beijing
Mingxing Guo University of Science and Technology Beijing
G. Li Team Maria Santofimia Navarro - Mechanical, Maritime and Materials Engineering
Jishan Zhang University of Science and Technology Beijing
Research Group
Team Maria Santofimia Navarro (Mechanical, Maritime and Materials Engineering) (TU Delft)
Copyright: © 2022 Liang Zhu, Mingxing Guo, G. Li, Jishan Zhang
DOI
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https://doi.org/10.1007/s10853-022-07527-8
More Info
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Published Date

2022

Language

English

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Faculty

Mechanical, Maritime and Materials Engineering

Department

Materials Science and Engineering

Research Group

Team Maria Santofimia Navarro

Abstract

The intergranular corrosion (IGC) resistance of age-hardening Al–Mg–Si–Cu alloys is closely related to the precipitation behavior adjacent to grain boundaries. In this study, we proposed to regulate the interaction of solute atoms and solute partitioning of Zn-containing Al–Mg–xSi–Cu alloys by introducing dislocations, which can synergistically decorate the intergranular and intragranular precipitation behavior. Consequently, the continuity of grain boundary precipitates and width of solute-depleted precipitate-free zones are inhibited accompanied with high number density or coarse precipitate in the matrix. As a result, the IGC resistance is greatly improved without strength and ductility loss, and the related mechanism has been proposed.