Microstructure Design of Semi-Solid Slurry for Metal Direct Writing

Li，Z.1,2; Hu，X. G.1,2; Lu，H. X.1; Zhu，Q.1,2

2023

Solid State Phenomena

348

33-38

Metal direct writing in semi-solid slurry is an innovative technology to realize low-cost printing of load-bearing parts in contrast to laser-based additive manufacturing. However, it is challenging to achieve near net-forming of 3D parts in the current stage because of the out of controlled microstructure and hence the unstable macro extrusion of the used semi-solid slurry. Here, mixed powder remelting (MPR) is introduced to actively design the characteristics of solid phases, i.e., solid fraction, shape factor, and size distribution. Specifically, high-melting-point pure Al powder served as the dispersed solid phases in the liquid phase that transformed from Al-Si alloy powder after remelting, leading to hypoeutectic Al-Si semi-solid slurry. The effectiveness and efficiency of this approach was experimentally examined and kinetically modelled, to prepare semi-solid slurry with pre-set microstructure. Furthermore, the manufacturing of semi-solid composite slurry was also verified.

aluminum alloys metal direct writing shape factor size distribution solid fraction

1012-0394

1662-9779

2-s2.0-85170387757

10.4028/p-qdK1X5

English

First ; Corresponding

Scopus

1.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Shenzhen Key Laboratory for Additive Manufacturing of High-performance materials,Shenzhen,518055,China

Li，Z.,Hu，X. G.,Lu，H. X.,et al. Microstructure Design of Semi-Solid Slurry for Metal Direct Writing,2023:33-38.