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Selective Laser Melting of Gas Atomized Al–3.02Mg–0.2Sc–0.1Zr Alloy Powder: Microstructure and Mechanical Properties
Author(s) -
Li Ruidi,
Chen Hui,
Chen Chao,
Zhu Hongbin,
Wang Minbo,
Yuan Tiechui,
Song Bo
Publication year - 2019
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201800650
Subject(s) - materials science , microstructure , selective laser melting , alloy , ultimate tensile strength , metallurgy , composite material , welding , elongation
Additive manufactured Sc modified Al alloys for lightweight application is now arousing widespread attraction. The selective laser melting (SLM) of gas atomized Al – 3.02Mg – 0.2Sc – 0.1Zr powder is studied, with the emphasis on its densification, microstructure, and properties. The intrigued finding is that the very high elongation‐to‐failure of 32.5% is obtained with medium tensile strength of 373 MPa after heat treatment of SLM sample. The average relative density is about 98.3% at a volumetric energy density range of (VED) 42–111 J mm −3 . The microstructure of produced sample shows cracks but it can be inhibited by increasing the VED. At an excessive VED, the weld pool is transformed from heat conduction to keyhole mode owing to the metal evaporation. Nano‐sized Al 3 (Sc,Zr) precipitates with a diameter of 5–50 nm are observed, which is responsible for the main strengthening mechanism. The underlying mechanisms of metallurgical defects, weld pool mode and mechanical properties are also illuminated.