Investigation on θ′ precipitate thickening in 2519A-T87 aluminum alloy plate impacted

• Published in: Journal of alloys and compounds 2009-05, Vol.476 (1), p.L1-L3
• Main Authors: Gao, Zhi-guo, Zhang, Xin-ming, Chen, Ming-an
• Format: Article
• Language: English
• Subjects: Aluminum alloy; Cold working, work hardening; annealing, quenching, tempering, recovery, and recrystallization; textures; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Materials science; Microstructure; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; Precipitation; Treatment of materials and its effects on microstructure and properties; X-ray diffraction
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2008.08.055

Split Hopkinson pressure bar setup was used as experimental method for dynamic impacted testing at 723 ± 5 K at the nominal strain rate of 2400 ± 100 to 7000 ± 100 s −1. The microstructure of 2519A-T87 aluminum alloy plate impacted was characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). The findings indicated that the thickness of θ′ precipitate could be manipulated by adjusting the strain rate of impacted specimens, and its thickening became obvious gradually when the strain rate was above 2400 ± 100 s −1. Most of the semi-coherent plate-like θ′ precipitates were consequentially transformed to incoherent spherical θ′ precipitates only when the strain rate was up to 7000 ± 100 s −1, which was attributed to more adiabatic energy absorbed by Al matrix and precipitates.