Twin boundary defects-assisted dual-nanoprecipitation in a 
selective-laser-melted Al alloy

An, Fengchao; Hou, Junhua; Qian, Bingnan; Liebscher, Christian; Lu, Wenjun

doi:10.1016/j.matchar.2023.112993

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Twin boundary defects-assisted dual-nanoprecipitation in a selective-laser-melted Al alloy

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Liebscher, Christian
Advanced Transmission Electron Microscopy, Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

An, F., Hou, J., Qian, B., Liebscher, C., & Lu, W. (2023). Twin boundary defects-assisted dual-nanoprecipitation in a selective-laser-melted Al alloy. Materials Characterization, 202: 112993. doi:10.1016/j.matchar.2023.112993.

Cite as: https://hdl.handle.net/21.11116/0000-0010-0B9C-3

Abstract

A novel phenomenon of twin boundary-assisted dual-nanoprecipitation in a selective-laser-melted (SLM) Al alloy is systematically investigated. The dual-nanoprecipitation of Mg-Zn-rich η’ and Al-Sc-Zr-rich L12 phases is observed at a twin boundary. This twin boundary can be decomposed into incoherent twin boundaries with 9R phases, whereas provide nucleation sites for the dual-nanoprecipitation during in-situ heating at 120 °C. Such dual-nanoprecipitation is primarily driven by the Gibbs-free energy difference between the incoherent twin boundaries with 9R phases and the adjacent matrix. The results offer primary guidance to design a novel SLM Al alloy with dense twins and precipitations.