Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8015009 | Materials Letters | 2018 | 11 Pages |
Abstract
Highly-dense Al-5Si-1Cu-Mg alloy bulk was firstly produced by laser additive manufacture (LAM) technique. LAM involves extraordinary thermal cycles and will therefore significantly affect the microstructure. In this research, the phase evolution of LAMed Al-5Si-1Cu-Mg alloy was studied in detail by characterization along the deposition direction. The rapid solidification of LAM encourages the generation of various unstable phases of vermicular Si, fishbone shaped θ-Al2Cu, blocky Ï-Al8Mg3FeSi6 and irregular Q-Al5Mg8Cu2Si6. As the increasing times of thermal cycling, phase evolution takes place by spheroidization of Si phases, transformation of Ï-Fe to plate-like β-Al5FeSi with dissolution of θ and Q phases. In particular, after certain times of thermal excursions, many micron-sized and nano-sized Qâ² phases precipitate out from matrix, and the stabilized microstructure consists of α-Al, Qâ², Si and β.
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Jing Li, Xu Cheng, Dong Liu, Shu-Quan Zhang, Zhuo Li, Bei He, Hua-Ming Wang,