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MM: Fachverband Metall- und Materialphysik

MM 65: Additive Manufacturing: Microstructure Development

MM 65.3: Talk

Thursday, March 21, 2024, 17:15–17:30, C 230

Developing of Zr-Based Bulk Metallic Glass through Laser Powder Bed Fusion Employing Conventional and Non-Standard Beam Distributions — •Sepide Hadibeik¹, Hossein Ghasemi-Tabasi², Andreas Burn³, Florian Spieckermann⁴, and Jürgen Eckert⁵ — ¹Chair of Materials Physics, Montanuniversität Leoben, Jahnstraße 12, 8700 Leoben, Austria — ²Switzerland Innovation Park Biel/Bienne, Aarbergstrrasse 46, 2503 Biel/Bienne, Switzerland — ³Switzerland Innovation Park Biel/Bienne, Aarbergstrrasse 46, 2503 Biel/Bienne, Switzerland — ⁴Chair of Materials Physics, Montanuniversität Leoben, Jahnstraße 12, 8700 Leoben, Austria — ⁵Erich Schmid Institute, Austrian Academy of Sciences, Jahnstraße 12, 8700 Leoben, Austria

Limitations in metallic glass additive manufacturing arise from the relaxation of solidified layers, diminishing free volume and adversely affecting part quality. Modifying the laser beam shape offers control over the molten pool's configuration and temperature distribution, bolstering productivity. Employing an advanced beam shaping technique in laser powder bed fusion, featuring a non-Gaussian, uniform beam distribution, resulted in a shallow and broad molten pool. Analysis using pair distribution function and differential scanning calorimetry demonstrated improved amorphous structure with reduced relaxation. This non-standard beam shape induced increased free volume and enhanced atomic rearrangements, contributing to improved structural heterogeneity observed in hardness measurements.

Keywords: Laser powder bed fusion (LPBF); Laser beam shaping; Bulk metallic glass (BMG)