[T20] Materials Characterization of AM Materials

[14D-T20-01] Additively Manufactured Sustainable 8xxx-series Aluminum and an In-situ TEM Observation

*S. Tsai¹, J. Wang¹, T. Tsao¹, M. Lee², M. Chu², Z. Sun³ (1.Department of Materials Science and Engineering, National Taiwan University, Taiwan, 2.Center for Condensed Matter Sciences, National Taiwan University, Taiwan, 3.Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), Singapore)

Keywords:Fe, 8xxx series Al, laser-powder bed fusion (LPBF), in-situ TEM heating

Fe has been identified as a detrimental element in Al alloy systems due to its proclivity to co-precipitate with other elements. The formation of brittle intermetallic phases by Fe impedes the sustainable utilization of Al. Nevertheless, the role of Fe in laser-powder bed fusion (LPBF) processes requires reconsideration. It is noteworthy that the rapid cooling rate provided by LPBF facilitates both the freezing of doping elements and the formation of well-dispersed cellular structures and precipitates. Despite the numerous advantages offered by these sub-structures, the precise microstructure evolution during the LPBF process remains unclear. In order to gain a comprehensive understanding of the phenomenon in question, we first designed and tested several 8xxx series Al alloys with the objective of exploring the ability of these materials to resist high-temperature softening. The second part of the study involved conducting in-situ TEM heating experiments on the LPBF-built AlFeMoSiZr system.