| dc.description.abstract | Metallic glass has plenty of advantages, including high hardness, strength, Young’s modulus, elasticity, and good corrosion and wear resistance. However, it becomes brittle under room temperature and nearly does not perform plastic deformation. Hence, introducing the crystal materials into composites can enhance the plasticity in order to provide a wider variety of applications.
To understand how to enhance the ductility of the material, some scholars have proposed that the size of the interior dendrites and the distance between each dendrite can affect the expansion and concentration of shear band, and some scholars have proved that the material interface, where the boundary between crystalline and amorphous phase meet, can absorb strain energy effectively by simulations. Although the above ideas have been proved, there is no clear explanation for the interior dendrites of materials. By observing the changes in microstructure of dendrites under stress in different experiments, we can analyze the effects caused by the changes.
To explain the changes in interior structure of material, the first experiment will be conducted to analyze the different levels of deformation and effects to heat by Differentiation Scanning Calorimetry (DSC). Next, High-energy X-ray Diffraction will be used to obtain the information of Full Width Half Maximum (FWHM). By means of changes of FWHM under different compression cycles, the phenomenon can be explained with the aid of comparisons of microstructure information by Convolutional Multiple Whole Profile fitting (CMWP). Then using of High Resolution Transmission Electronic Microscopy (HR-TEM) and Molecular dynamics, we can prove the accuracy of our built model and the explanations for the above mentioned phenomenon, therefore we can have a better understanding on mechanism of improving the ductility of the bulk metallic glass composite materials.
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