首页|Inhibiting segregation enabled outstanding combination of mechanical and corrosion properties in precipitation-strengthened aluminum alloys

Inhibiting segregation enabled outstanding combination of mechanical and corrosion properties in precipitation-strengthened aluminum alloys

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Segregation of solutes to grain boundary(GB)is the dominant restriction on enhancement of mechanical properties and corrosion resistance during aging in precipitation-strengthened aluminum alloys.Here,we innovatively introduce the cyclic deformation by the vibration during aging to eliminate the GB segre-gation,resulting in the formation of the narrow precipitate-free zone(PFZ)widths near the GB,as well as the fine and discontinuous grain boundary precipitations(GBPs).Compared with the traditional peak-aging,the 2014 aluminum alloy treated by thermal cooperative vibration aging(TCVA)exhibits a superb combination of impact toughness and corrosion resistance,and retains the strength and ductility.In ad-dition,the atomic simulations show that TCVA generates numerous vacancies near the GB,but does not change the dislocation density with the increase of cycle time.These results indicate that the vacancy significantly promotes the nucleation and growth of precipitates in the vicinity of GB,resulting in the narrow PFZs and fine discontinuous GBPs.The present work provides the fundamental knowledge and method to inhibit the equilibrium segregation of solutes to GB during aging,and further realizes the precipitation-strengthened aluminum alloys with excellent mechanical and corrosion properties.

Precipitation-strengthened aluminum alloysPrecipitate-free zoneGrain boundary precipitationMechanical propertiesCorrosion resistance

Fang Li、Geng Chen、Sijun Chen、Changjun Zhu、Kanghua Chen

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Powder Metallurgy Research Institute,Central South University,Changsha 410083,China

Light Alloy Research Institute,Central South University,Changsha 410083,China

National Key Research and Development Program of ChinaState Key Laboratory of High-Performance Complex Manufacturing of Central South University

2021YFF0600504ZZYJKT2020-03

2024

10.1016/j.jmst.2023.06.067

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.179(12)
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