|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Multiscale Architectured Materials (MAM II): Tailoring Mechanical Incompatibility for Superior Properties
||Chemical Etching of Ti Lattice Structures Manufactured by Electron Beam Melting: Influence on the Stiffness of the Octet-Truss Structures and Modeling of the Dissolution Kinetics at the Scale of Individual Struts
||Pierre Lhuissier, Charlotte De Formanoir, Guilhem Martin, Rémy Dendievel, Stephane Godet
|On-Site Speaker (Planned)
In the present work, titanium octet-truss lattice structures of various densities were produced by electron beam melting (EBM). The as-built struts exhibit an important roughness level. Consequently, a chemical etching procedure was developed and was shown to significantly reduce the roughness throughout the entire lattice structure. The decrease in roughness comes along with an increase in stiffness to density ratio. This is attributed to the increased mechanical efficiency of the struts associated with the removal of powder particles stuck to the surface and with the global decrease in roughness. Individual struts were characterized experimentally while submitted to a chemical etching treatment by high resolution X-ray tomography. A cellular automaton based model was also developed in order to predict the evolution of the as-built strut under etching. The model enables to predict the overall and local etching rates as well as the evolution of the decrease in roughness.