Mechanical property and microstructure evolution of novel Al–Mg–Zn(–Cu) alloys under dynamic impact. Issue 9 (13th June 2021)

• Record Type: Journal Article
• Authors: Liu, Haoran; Zhao, Zeyu; Zhang, Di; Zhang, Jishan
• Is Part Of: Materials science and technology. Volume 37:Issue 9(2021)
• Page Start: 852
• Page End: 862
• Publication Date: 2021-06-13
• Subjects: Al alloy -- dynamic impact -- adiabatic shear bands -- precipitates -- temperature rise; Materials science -- Periodicals; Microstructure -- Periodicals; Metallurgy -- Periodicals; 620.1105
• DOI: 10.1080/02670836.2021.1960554
• Languages: English
• ISSNs: 0267-0836

Abstract

Abstract : Dynamic impact performance is one of the most important properties for lightweight aluminium armour vehicles. Here, we study the microstructure evolution of novel high-strength T-Mg32 (AlZnCu)49 phase strengthened Al–Mg–Zn(–Cu) alloys during dynamic impact with strain rates from 2800 to 4800 s −1 . Adiabatic shear bands appeared in both alloys after impact at 4800 s −1 . Recrystallisation occurred inside ASB of the Cu-bearing alloy because of the higher temperature rise compared with Cu-free alloy. The negative change of flow stress is observed at 4800 s −1 for Cu-free alloy, but for Cu-bearing alloy that is positive at strain rates from 2800 to 4800 s −1, and the coarsening and decrease in the density of precipitates should be responsible for this rather than recrystallisation.