Coarsening kinetics and strengthening mechanisms of core-shell nanoscale precipitates in Al-Li-Yb-Er-Sc-Zr alloy

Yang Wang ¹Shun Zhang ¹Ruizhi Wu ²Nodir Turakhodjaev ³Legan Hou ¹Jinghuai Zhang ¹Sergey Betsofen⁴

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作者信息

1. Key Laboratory of Superlight Materials&Surface Technology,Ministry of Education,Harbin Engineering University,Harbin 150001,China
2. Key Laboratory of Superlight Materials&Surface Technology,Ministry of Education,Harbin Engineering University,Harbin 150001,China;College of Science,Heihe University,Heihe 164300,China
3. Department of Machine Building,Tashkent State Technical University,Tashkent 100056,Uzbekistan
4. Moscow Aviation Institute,National Research University,Moscow 109383,Russia
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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℃ and the shell was Li-rich formed at 150℃.The coarsening kinetics and precipitate size distributions(PSDs) of Al3(Yb,Er,Sc,Zr,Li)particles aged at 150℃ previously aged at 300℃ for 24 h showed a better fit to the relation of <r>2α 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℃.

Key words

Al-Li alloys/Aging/Core-shell structure/Coarsening kinetics/Strengthening mechanisms

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基金项目

出版年

2021

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI

影响因子：0.657

ISSN：1005-0302

参考文献量32

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