Effect of Er and Zr additions and aging treatment on grain refinement of aluminum alloy fabricated by laser powder bed fusion

Wen, Shengping ¹Wu, Xiaolan ¹Gao, Kunyuan ¹Rong, Li ¹Huang, Hui ¹Nie, Zuoren ¹Guo, Yanwu ¹Wei, Wu ¹Shi, Wei ²Zhang, Bo ¹Zhou, Xiaorong³

扫码查看

作者信息

1. Beijing Univ Technol
2. Inst Corros Sci & Technol
3. Univ Manchester
折叠

Abstract

In this work, Al-0.88Er-0.78Zr (wt%) alloy was fabricated via laser powder bed fusion (LPBF). The microstructure, precipitates distribution, electrical conductivity and hardness of as-built and aging treatment specimens were carefully characterized. Results show that LPBF process greatly expand the solid solubility of Er and Zr in Al. The addition of Er can significantly refine the grain size and form a bimodal grain structure consisting of fine equiaxed grains (grain size ~0.53 & PLUSMN; 0.15 mu m) at the boundary of molten pool together with coarse columnar grains (width 2.57 +/-& nbsp;0.84 mu m) at the center of molten pool. After 375 celcius for 3 h aging treatment, the particles on the grain boundary inhibit the grain growth; at the same time, a large number of Al3(Er,Zr) particles with L12 structure and size of 2.25 +/-& nbsp;0.3 nm are precipitated, which plays a major role in enhancing the hardness with the peak hardness of about 89.24 & PLUSMN; 3.77 HV. Er and Zr elements are proved to be an alternative way of the additive elements for developing a new 3D printing high-strength aluminum alloy.(C)& nbsp; 2022 Elsevier B.V. All rights reserved.

Key words

Aluminum/Laser powder bed fusion/Erbium/Bimodal grain structure/Precipitation/MECHANICAL-PROPERTIES/EQUIAXED TRANSITION/SC/MICROSTRUCTURE/PRECIPITATION/RESISTANCE/COHERENCY/BEHAVIOR/COLUMNAR/DESIGN

引用本文复制引用

出版年

2022

Journal of Alloys and Compounds

EISCI

ISSN：0925-8388

被引量9

参考文献量50

段落导航