研究目的
Investigating the influence of laser power on the properties of additively manufactured Zr-based alloy (Zr59.3Cu28.8Al10.4Nb1.5, trade name AMZ4), focusing on porosity, crack-formation, phase composition, and mechanical properties to identify an optimal processing window.
研究成果
The study demonstrates that laser power in SLM can effectively influence the density and structure of AMZ4, with increased power reducing porosity but also causing devitrification. Oxygen plays a critical role in phase stabilization, and process parameters can be tailored to achieve desired material properties.
研究不足
The study highlights the role of oxygen in phase stabilization, indicating that minimizing oxygen contamination is crucial for obtaining fully amorphous components. The high cooling/heating rates achievable with SLM are essential for processing glass-forming alloys.
1：Experimental Design and Method Selection
The study utilized selective laser melting (SLM) to fabricate cylindrical samples from Zr59.3Cu28.8Al10.4Nb1.5 (AMZ4) powder. The influence of laser power on the structure and properties was analyzed, with parameters varied to explore phase formation, porosity, and mechanical properties.
2：Sample Selection and Data Sources
Gas-atomized AMZ4 powder was used, with samples fabricated using an EOS M100 SLM system. Cylindrical samples were produced for analysis.
3：List of Experimental Equipment and Materials
EOS M100 SLM system, X-ray diffraction (XRD, Cu-Kα radiation, Bruker D8), SEM (Zeiss 1550 with Aztec EDS), TEM (FEI Titan Themis 200), DSC (NETZSCH DSC204F1), nanoindentation (CSM Instruments Ultra Nano Hardness Tester).
4：Experimental Procedures and Operational Workflow
Samples were fabricated with varying laser powers (55 W to 105 W) and analyzed for phase composition, porosity, and mechanical properties. Re-melting scan strategy was employed to ensure dense and crack-free material.
5：Data Analysis Methods
XRD for phase analysis, SEM and TEM for microstructure and elemental distribution, DSC for thermal properties, nanoindentation for mechanical properties.
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