Interface precipitation and corrosion mechanisms in a model Al–Zn–Mg–Cu alloy strengthened by TiC particles. (September 2022)

• Record Type: Journal Article
• Authors: Zhao, Kai; Han, Guang; Gao, Tong; Yang, Huabing; Qian, Zhao; Hu, Kaiqi; Liu, Guiliang; Nie, Jinfeng; Liu, Xiangfa
• Is Part Of: Corrosion science. Volume 206(2022)
• Publication Date: 2022-09
• Subjects: Al matrix composite -- TiC -- Interface precipitation -- Corrosion mechanisms; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2022.110533
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: Interface precipitation and corrosion behaviors in the cast and extruded TiCp /7050 composites are comprehensively investigated herein. Aging precipitates are inclined to segregate at α-Al/TiC interfaces and preferential dissolution of interface precipitates aggravates localized corrosion susceptibility of composites. Moreover, distribution configurations of TiC affect corrosion resistance of composites, being composites with dispersively distributed TiC have better corrosion resistance compared to those in which the particles are distributed forming networks or chains. This work discloses the relationship between interfacial precipitation and corrosion mechanisms in the composites, which should shed light on designing and fabricating 7xxx composites with high mechanical and corrosion performance. Graphical Abstract: ga1 Highlights: Relationship between interface precipitation and corrosion behaviors is investigated. Interface precipitates incline to segregate at the α-Al/TiC interfaces. Distribution configuration of TiC nanoparticles affect corrosion performance of composites. Composites exhibit a decreased corrosion resistance due to aggravated IGC.