Details

Autor(en) / Beteiligte

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

Titel

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

Ist Teil von

• Journal of alloys and compounds, 2022-08, Vol.912, p.165237, Article 165237

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2022

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• 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 ± 0.15 µm) at the boundary of molten pool together with coarse columnar grains (width 2.57 ± 0.84 µm) at the center of molten pool. After 375 ℃ 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 ± 0.3 nm are precipitated, which plays a major role in enhancing the hardness with the peak hardness of about 89.24 ± 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. [Display omitted] •The co-addition of Er and Zr provides grain refinement on Al-alloy fabricated by LPBF.•Al3(Er,Zr) precipitates provide heterogeneous nucleation sites leading to a unique bimodal grain structure.•LPBF process expands the solid solubility of Er and Zr in the aluminum matrix.•Nano-sized Al3(Er,Zr) precipitates play a major strengthening role on artificial aged alloy.