Characterization, mechanical properties and dimensional accuracy of a Zr-based bulk metallic glass manufactured via laser powder-bed fusion
In: Materials & Design, 199, 2021
Online
academicJournal
Zugriff:
Bulk metallic glasses (BMGs) are high-strength, highly elastic materials due to their disordered atomic structure. Because BMGs require sufficiently high cooling rates to bypass crystallization, laser-based additive manufacturing (AM) methods have recently been employed for the fabrication of BMGs. In this study, we present an optimized Laser Powder-Bed Fusion (LPBF) process on a Zr-based BMG (Zr59.3Cu28.8Al10.4Nb1.5, in at.%), with a focus on characterization, mechanical properties, and dimensional accuracy. A volumetric density of 99.82% was achieved. Although the sample was qualified as amorphous via laboratory X-ray diffraction experiments, a more meticulous study using synchrotron radiation revealed nanocrystals in the heat-affected zones (HAZs) of the melt pool. Fast differential scanning calorimetry (FDSC) and numerical simulations were then employed to illustrate the mechanism of crystallization. The LPBF-processed alloy revealed excellent mechanical properties, such as high hardness, wear resistance, compressive strength, and flexural strength. Apart from vein-like patterns, the fracture surfaces of the compression test samples showed liquid-like features, which indicate a significant local temperature increase during fracture. The dimensional accuracy was assessed with a benchmark exhibiting complex geometrical features and reached at least 40 μm. The results indicate that LPBF processing is a promising route for the manufacturing of BMGs for various applications. ; ISSN:0264-1275 ; ISSN:1873-4197
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Characterization, mechanical properties and dimensional accuracy of a Zr-based bulk metallic glass manufactured via laser powder-bed fusion
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Autor/in / Beteiligte Person: | Sohrabi, Navid ; Jhabvala, Jamasp ; Kurtuldu, Güven ; Stoica, Mihai ; Parrilli, Annapaola ; Berns, Siddartha ; Polatidis, Efthymios ; Van Petegem, Steven ; Hugon, Sylvain ; Neels, Antonia ; Löffler, Jörg F. ; Logé, Roland E. |
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Zeitschrift: | Materials & Design, 199, 2021 |
Veröffentlichung: | Elsevier, 2021 |
Medientyp: | academicJournal |
DOI: | 10.3929/ethz-b-000458604 |
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