研究目的
To develop a novel high-throughput method using ultrasonic wave technique to systematically screen the optimum process parameters for the laser additive manufacturing (LAM) of Zr51 bulk metallic glass (BMG) with the slightest flaws.
研究成果
The ultrasonic wave technique effectively screens the optimum LAM parameters for Zr51 BMG, identifying 1300 W laser power and 600 mm/min travel speed as optimal. The method's validity is confirmed by the amorphous-phase dominated microstructure and high tensile strength of the fabricated BMG.
研究不足
The study is limited to Zr51 BMG and may not be directly applicable to other BMG compositions. The ultrasonic wave testing's accuracy in detecting very small flaws needs further validation.
1：Experimental Design and Method Selection:
The study employs ultrasonic wave testing to evaluate flaws in BMGs fabricated by LAM. A parameter library of BMG samples is created under varying laser power and travel speed combinations.
2：Sample Selection and Data Sources:
Rectangular Zr51 BMG samples are fabricated using LAM under different parameter combinations. Ultrasonic attenuation factor is measured to assess flaw severity.
3：List of Experimental Equipment and Materials:
A 6000 W fiber laser system, Zr51 metallic powder, ultrasonic testing setup with 15 MHz transducers, and X-ray micro computed tomography machine are used.
4：Experimental Procedures and Operational Workflow:
BMG samples are fabricated, then subjected to ultrasonic testing and X-ray tomography for flaw characterization. Tensile tests are performed to evaluate mechanical properties.
5：Data Analysis Methods:
Ultrasonic attenuation factor is correlated with flaw severity. XRD and tensile test results validate the ultrasonic findings.
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