Coarsening kinetics and strengthening mechanisms of core-shell nanoscale precipitates in Al-Li-Yb-Er-Sc-Zr alloy
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第2期
论文作者：Yang Wang Shun Zhang Ruizhi Wu Nodir Turakhodjaev Legan Hou Jinghuai Zhang Sergey Betsofen
文章页码：197 - 203
摘 要：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-2 Li-0.1 Yb-0.1 Er-0.1 Sc-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 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.
Yang Wang1，Shun Zhang1，Ruizhi Wu1,2，Nodir Turakhodjaev3，Legan Hou1，Jinghuai Zhang1，Sergey Betsofen4
1. Key Laboratory of Superlight Materials & Surface Technology, Ministry of Education, Harbin Engineering University2. College of Science, Heihe University3. Department of Machine Building, Tashkent State Technical University4. Moscow Aviation Institute, National Research University
摘 要：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-2 Li-0.1 Yb-0.1 Er-0.1 Sc-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 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.
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