材料科学技术(英文版)2022，Vol.99Issue(4) ：61-72.

Correlation between precipitates evolution and mechanical properties of Al-Sc-Zr alloy with Er additions

Li Liu Jian-Tang Jiang Xiang-Yuan Cui Bo Zhang Liang Zhen Simon P.Ringer
材料科学技术(英文版)2022，Vol.99Issue(4) ：61-72.
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Correlation between precipitates evolution and mechanical properties of Al-Sc-Zr alloy with Er additions

Li Liu 1Jian-Tang Jiang 2Xiang-Yuan Cui 3Bo Zhang 2Liang Zhen 4Simon P.Ringer3
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作者信息

  • 1. School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China;China-Ukraine Institute of Welding,Guangdong Academy of Sciences,Guangzhou 510651,China
  • 2. School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China
  • 3. School of Aerospace,Mechanical and Mechatronic Engineering,and Australian Centre for Microscopy and Microanalysis,The University of Sydney,New South Wales 2006,Australia
  • 4. School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China;School of Materials Science and Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China
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Abstract

Correlation between precipitates evolution and mechanical properties of Al-Sc-Zr alloy with Er additions during isothermal ageing were investigated by microhardness measurements,transmission electron mi-croscopy,atom probe tomography and density functional theory-based simulations.The results demon-strate that the Er additions significantly improve the hardness during elevated temperature ageing,es-pecially at 400℃.This is mainly because Er additions increase the nucleation rate of the Al3(Er,Sc,Zr)precipitates,resulting in a higher density of fine and uniform dispersion of L12 structured nanoparticles.First-principles calculations demonstrate that the second nearest neighboring solute-solute interactions for the species Sc,Zr and Er are energetically favored-a key feature to rationalize the observed pre-cipitate structure and the underlying formation mechanism.The sequential formation of the core/shell precipitates in the Er-free alloy and core/double-shell precipitates in the Er-containing alloy arises due to the different solute-solute and solute-vacancy interaction energies,and the relative diffusivities of the Er,Sc and Zr species in Al.These results shed light on the beneficial effects of Er additions on the age-hardening behavior of Al-Sc-Zr alloy and provide guidance for designing the ageing treatments for the Al-Sc-Zr(-Er)alloys.

Key words

Al alloys/Isothermal ageing/Microhardness/Transmission electron microscopy/Atom probe tomography/First-principles calculations

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基金项目

National Natural Science Foun-dation of China(U1737206)

National Natural Science Foun-dation of China(51971077)

AUSMURI program(AUSMURI000005)

Sci-ence and Technology Plan Project of Guangzhou City(201807010063)

出版年

2022
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72
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