研究目的
Investigating the effect of pre-existing nuclei on the crystallization behavior of Zr-based bulk metallic glasses (BMGs) during laser welding.
研究成果
The study concludes that pre-existing nuclei significantly influence the crystallization behavior of Zr-based BMGs during laser welding, shifting the TTT curve from a 'C-shape' to an 'ε-shape'. Two quality factors, Qt and Qx, were defined to quantify the effect of pre-existing nuclei. The findings provide a fundamental understanding of the differences in TTT curves between heating and cooling processes for the same BMG.
研究不足
The study assumes that the crystallization process follows only the classical nucleation theory without considering other mechanisms. The detection limits of XRD and TEM may not capture very low degrees of crystallization. The thermal history of the BMG during casting is not fully known, leading to approximations in the model.
1：Experimental Design and Method Selection:
The study involves laser welding experiments on Zr-based BMG samples with and without pre-existing nuclei to observe crystallization behavior. The classical nucleation/growth theory is integrated with a heat transfer model to study the evolution of crystalline phase.
2：Sample Selection and Data Sources:
Two samples of Zr-based BMG (Zr
3：5Ti5Al10Ni14Cu9) were used:
one as-cast and the other annealed to introduce additional nuclei.
4：List of Experimental Equipment and Materials:
A CW laser (YLR-1000, IPG Inc.), scanner (hurrySCAN III, SCANLAB Inc.), DSC (TA Instruments DSC 2010), XRD (Panalytical X'pert Pro), TEM (FEI TECNAI F20 TEM system), and SEM (Helios S600).
5：0). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Laser welding was performed on the BMG samples under controlled conditions. The samples were then analyzed using OM, SEM, XRD, and TEM to observe crystallization.
6：Data Analysis Methods:
The data was analyzed using the classical nucleation theory and heat transfer model to understand the crystallization behavior and the effect of pre-existing nuclei.
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X'pert Pro
X'pert Pro
Panalytical
X-ray diffraction
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TECNAI F20 TEM system
TECNAI F20
FEI
Transmission electron microscopy
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Helios S600
Helios S600
FEI
Scanning electron microscopy
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YLR-1000
YLR-1000
IPG Inc.
Laser welding
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hurrySCAN III
hurrySCAN III
SCANLAB Inc.
Controlling the motion of the laser beam
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DSC 2010
DSC 2010
TA Instruments
Differential scanning calorimetry
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