Dresden 2026 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 35: Additive Manufacturing / Transport in Materials III
MM 35.1: Talk
Thursday, March 12, 2026, 15:45–16:00, SCH/A216
Tailoring Microstructure and Mechanical Properties of LPBF Ti-5553 Alloy by STA Heat Treatment — •Yang Lei1,2, Parthiban Ramasamy2, and Jürgen Eckert1,2 — 1Department of Materials Science, Chair of Materials Physics, Montanuniversität Leoben, Jahnstraße 12, A-8700 Leoben, Austria — 2Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, A-8700 Leoben, Austria
Ti-5553 is a metastable β titanium alloy widely used in aerospace gears due to its exceptional strength, toughness, and hardenability. However, Laser Powder Bed Fusion (LPBF) fabrication introduces significant limitations, particularly strong anisotropy and persistent columnar grains.
Solution Treatment and Aging (STA) offers a critical pathway to tailor these properties. This study investigates the microstructural evolution during STA, revealing a competition between nucleation driving force and diffusion kinetics that dictates the initial α-phase morphology. Notably, the columnar β grain size was restricted after heat treatment due to Zener pinning effect exerted by α precipitates, which impedes boundary migration and suppresses recrystallization.
Consequently, the specific microstructural features formed during solution treatment significantly influence subsequent aging behavior. Since β-grain refinement is inhibited, the enhancement in tensile strength is attributed primarily to Orowan strengthening via dispersed precipitates rather than Hall-Petch strengthening.
Keywords: Ti-5553; Laser Powder Bed Fusion; Heat treatment; Microstructure evolution; Zener pinning effect