Characterization, mechanical properties and dimensional accuracy of a Zr-based bulk metallic glass manufactured via laser powder-bed fusion

Sohrabi, Navid (EPFL, Lausanne, Switzerland) ; Jhabvala, Jamasp (EPFL, Lausanne, Switzerland) ; Kurtuldu, Güven (ETH Zürich, Zürich, Switzerland) ; Stoica, Mihai (ETH Zürich, Zürich, Switzerland) ; Parrilli, Annapaola (Center for X-ray Analytics, Swiss Federal Laboratories for Materials Science and Technology (empa), Dübendorf, Switzerland) ; Berns, Siddartha (School of Management and Engineering Vaud, HES-SO // University of Applied Sciences Western Switzerland) ; Polatidis, Efthymios (Paul Scherrer Institute, Villingen, Switzerland) ; Van Petegem, Steven (Paul Scherrer Institute, Villingen, Switzerland) ; Hugon, Sylvain (School of Management and Engineering Vaud, HES-SO // University of Applied Sciences Western Switzerland) ; Neels, Antonia (Center for X-ray Analytics, Swiss Federal Laboratories for Materials Science and Technology (empa), Dübendorf, Switzerland) ; Löffler, Jörg F. (ETH Zürich, Zürich, Switzerland) ; Logé, Roland E. (EPFL, Lausanne, Switzerland)

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.


Keywords:
Article Type:
scientifique
Faculty:
Ingénierie et Architecture
School:
HEIG-VD
Institute:
COMATEC - Institut de Conception, Matériaux, Emballage & Conditionnement
Date:
2020-12
Pagination:
14 p.
Published in:
Materials & Design
Numeration (vol. no.):
2020, vol. 199, article no. 109400
DOI:
ISSN:
0264-1275
Appears in Collection:



 Record created 2021-05-07, last modified 2021-05-10

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