Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor | Department of Industrial and Systems Engineering | en_US |
| dc.contributor.advisor | Chan, K. C. (ISE) | en_US |
| dc.creator | Yang, Congrui | - |
| dc.identifier.uri | https://theses.lib.polyu.edu.hk/handle/200/14528 | - |
| dc.language | English | en_US |
| dc.publisher | Hong Kong Polytechnic University | en_US |
| dc.rights | All rights reserved | en_US |
| dc.title | Mechanical and functional properties of metallic glass lattices fabricated by laser powder bed fusion | en_US |
| dcterms.abstract | The advancement of materials has long served as a cornerstone of societal progress, with each breakthrough contributing to substantial gains in productivity and technological capability. In the 21st century, the demand for high-strength metallic materials has become increasingly urgent, particularly in aerospace, aviation, and high-speed transportation industries. Among the most promising candidates for next-generation structural materials are metallic glasses (MGs)-that lack crystalline defects such as dislocations and grain boundaries, and exhibit a unique combination of metallic and glass-like properties. These characteristics endow MGs with exceptional mechanical strength, elasticity, and corrosion resistance. However, widespread engineering application of MGs has been limited by manufacturing constraints, especially in fabricating complex architectures. | en_US |
| dcterms.abstract | The emergence of additive manufacturing (AM) has overcome many of these challenges, enabling the production of 3D-printed MG lattice structures with tunable geometries and mechanical properties. Such lattices embody the "material-structure-function" synergy and offer new avenues for tailoring performance in high-performance applications. Despite these advances, the mechanical behavior, failure mechanisms, and functional capabilities of MG lattice structures remain insufficiently understood. In particular, quantitative relationships between microarchitecture, defect distribution, and deformation modes are not well established. Furthermore, the effects of processing-induced heterogeneities such as partial crystallization, porosity, and surface defects on the long-term structural reliability and functional performance of MG lattice structures remain largely unexplored. | en_US |
| dcterms.abstract | To address these gaps, this thesis investigates the mechanical and functional performance of L-PBF fabricated MG lattices, with the dual aims of establishing robust structure-property relationships and unlocking new application potential. First, the compressive behavior and fracture mechanisms of MG lattices fabricated by conventional L-PBF technology, including strut-based body-centred cubic (BCC) and shell-based triply periodical minimal surfaces (TPMS) architectures, were systematically examined. This investigation aimed to elucidate how structural design influences damage tolerance and energy absorption. | en_US |
| dcterms.abstract | Subsequently, bio-inspired TPMS architectures were fabricated using μL-PBF technology to synergistically enhance both strength and ductility. In situ X-ray computed tomography (XCT) was employed to directly observe their failure processes, leading to the proposal of a hybrid ductilization mechanism that integrates micro- and macro-scale effects in MG lattices. | en_US |
| dcterms.abstract | Lastly, we explored the functional potential of MG lattices in catalysis by developing a comprehensive strategy for high-performance MG electrocatalyst design via multiscale structural engineering. Zr-based MG TPMS lattices were 3D-printed as mechanically robust, ultra-efficient mass transport scaffolds, followed by pulsed electrodeposition (PED) of NiMo amorphous microparticles. The PED process produced hydrangea-like NiMo particles with controlled amorphous heterogeneity, in which rich compositional interfaces (Ni₇₈Mo₂₂/Ni₆₈Mo₃₂) were formed, providing abundant interfacial sites that facilitate catalytic reactions. This hierarchical catalyst architecture achieved simultaneous optimization of catalytic activity, mechanical integrity, and mass transport, delivering exceptional overall water-splitting performance and opening new application avenues for 3D-printed MG lattices. | en_US |
| dcterms.abstract | The findings of this work provide essential insights into the structure-mechanical-functional correlations in MG lattices and lay the foundation for the development of advanced, multifunctional cellular materials for future engineering and energy-related applications. | en_US |
| dcterms.extent | xviii, 193 pages : color illustrations | en_US |
| dcterms.isPartOf | PolyU Electronic Theses | en_US |
| dcterms.issued | 2026 | en_US |
| dcterms.educationalLevel | Ph.D. | en_US |
| dcterms.educationalLevel | All Doctorate | en_US |
| dcterms.accessRights | open access | en_US |
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