研究目的
To demonstrate the potential of laser-foil-printing (LFP) additive manufacturing for fabricating high-quality Zr-based bulk metallic glass (BMG) parts with mechanical properties comparable to cast parts.
研究成果
LFP is able to produce fully amorphous BMG parts with nearly full density (~99.9%). The mechanical properties of the LFP parts, including micro-hardness, tensile strength, and flexural strength, are comparable to those of cast parts. The study demonstrates that LFP has a high potential for fabricating high-quality BMG parts with mechanical properties comparable to cast parts.
研究不足
The study acknowledges that the properties of the LFP parts can be further enhanced if the quality of the foil feedstock and the manufacturing technology are improved. The presence of a small amount of crystals (~4%) in the LFP part did not deteriorate the mechanical properties, but higher volume fractions of crystalline phases could make the part very brittle.
1：Experimental Design and Method Selection:
The study utilized laser-foil-printing (LFP) additive manufacturing technology to fabricate Zr52.5Ti5Al10Ni14.6Cu17.9 BMG parts. The process involved laser welding of metal foils layer-by-layer upon a substrate.
2：5Ti5Al10Ni6Cu9 BMG parts. The process involved laser welding of metal foils layer-by-layer upon a substrate.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Commercial grade Zr52.5Cu17.9Ni14.6Al10Ti5 MG foil was used as feedstock. Rectangular BMG parts were fabricated on a Ti-6Al-4V substrate.
3：5Cu9Ni6Al10Ti5 MG foil was used as feedstock. Rectangular BMG parts were fabricated on a Ti-6Al-4V substrate.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The LFP system consisted of a continuous wave fiber laser for foil-welding and a pulsed UV laser for foil-cutting. The process was performed inside a chamber with Ar shielding gas.
4：Experimental Procedures and Operational Workflow:
The process involved fixing a metal foil upon a flat substrate by laser spot-welding, followed by laser raster-scan welding to achieve full fusion and bonding of foil in selected regions. After welding, the workpiece was translated to the location under the UV laser beam for cutting along the contour of the sliced cross section.
5：Data Analysis Methods:
The mechanical properties of the fabricated BMG parts were measured using micro-indentation, tensile test, and four-point bending test. The phases formed were characterized using X-ray diffraction (XRD), and the microstructure was analyzed using optical microscopy.
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