|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Establishing Location Specific, Processing-Microstructure-Property-Relationships III
||Direct Metal Writing: Controlling the Rheology through Microstructure
||Wen Chen, Luke Thornley, Diran Apelian, Andrew Pascall, Eric Duoss, Joshua Kuntz, Christopher Spadaccini
|On-Site Speaker (Planned)
Additive manufacturing of metals is a challenge. Most metal additive manufacturing approaches are based on powder-bed melting techniques such as laser selective melting or electron beam melting, which often yield uncontrolled microstructures containing remarkable defects (e.g., pores or microcracks) and residual stresses. Here, we introduce a proof-of-concept prototype of three dimensional metal freeform fabrication process by direct writing of metallic alloys in the semi-solid regime. This is achieved through controlling the particular microstructure and the rheological behavior of semi-solid alloy slurries which demonstrate a well suited viscosity and shear thinning properties to retain shape upon solidification. The versatile microstructural manipulation within this method yields a flexible manufacturing route to fabricating three dimensional metal parts with full density and complex geometries that is unachievable by conventional metal additive manufacturing or processing methods such as casting or forming.
Prepared by LLNL under Contract DE-AC52-07NA27344.
||Planned: Supplemental Proceedings volume