Regensburg 2016 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 21: Microstructure and Phase Transformations I
MM 21.3: Vortrag
Dienstag, 8. März 2016, 12:15–12:30, H38
Microstructure development of aluminum based alloys in additive manufacturing revealed from differential fast scanning calorimetry and metallographic studies — •Bin Yang1, Olaf Kessler2, and Christoph Schick1 — 1Institute of Physics, University of Rostock, Rostock, Germany — 2Faculty of Mechanical Engineering and Marine Technology, University of Rostock, Rostock, Germany
To obtain the desired additive manufacturing (AM) fabricated aluminum-based alloy parts, the rapid solidification processes need to be investigated in-situ. Based on the calorimetric method (differential fast scanning calorimetry) developed for the study of metal particles, the solidification process of aluminum-based alloy powder-particles, i.e. AlSi10Mg, was studied, for the very first time, under AM relevant heating and cooling rate conditions. A preliminary series of DFSC heating and cooling experiments was conducted, applying cooling rates as high as 80,000 K/s. The differential fast scanning calorimeter traces revealed that the material undergoes a two-stage melting and solidification processes depending on heating and cooling rates. In particular, the solidification structure of the real time quenched single droplet was observed and analyzed with focused ion beam (FIB), scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM). This research proposed a new approach to research the solidification structure of single aluminum-based alloys particles used in AM technologies with precisely controlled size and extreme cooling rate.