Coarsening kinetics and strengthening mechanisms of core-shell nanoscale precipitates in Al-Li-Yb-Er-Sc-Zr alloy. (20th January 2021)

• Record Type: Journal Article
• Authors: Wang, Yang; Zhang, Shun; Wu, Ruizhi; Turakhodjaev, Nodir; Hou, Legan; Zhang, Jinghuai; Betsofen, Sergey
• Is Part Of: Journal of materials science & technology. Volume 61(2021)
• Page Start: 197
• Page End: 203
• Publication Date: 2021-01-20
• Subjects: Al-Li alloys -- Aging -- Core-shell structure -- Coarsening kinetics -- Strengthening mechanisms; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2020.05.061
• Languages: English
• ISSNs: 1005-0302

Abstract

Abstract: The tailored nanoparticles with a complex core/shell structure can satisfy a variety of demands, such as lattice misfit, shearability and coarsening resistance. In this research, core-shell nanoscale Al3 (Yb, Er, Sc, Zr, Li) composite particles were precipitated in Al-2Li-0.1Yb-0.1Er-0.1Sc-0.1 Zr (wt%) alloy through the double-aging treatment, in which the core was (Yb, Er, Sc, Zr)-rich formed at 300 °C and the shell was Li-rich formed at 150 °C. The coarsening kinetics and precipitate size distributions (PSDs) of Al3 (Yb, Er, Sc, Zr, Li) particles aged at 150 °C previously aged at 300 °C for 24 h showed a better fit to the relation of < r > 2 ∝ kt and normal distribution, indicating that the coarsening of precipitates was controlled by interface reaction, not diffusion. The Orowan bypass strengthening was operative mechanism at 150 °C.