A new Ti-based amorphous alloy Ti35Zr21Cu40Si4 with about 80 μm thickness and 5~8 mm width was fabricated by melt spinning method. The phase structure and thermal stabilities of the Ti35Zr21Cu40Si4 amorphous alloy were investigated by the X-ray diffraction (XRD) and differential scanning calorimetry (DSC), respectively. The Ti35Zr21Cu40Si4 amorphous alloy was cultivated in the simulate body fluid (SBF) for 15 days. And the blood compatibility was evaluated by dynamic clotting time and hemolysis rate test. The Ti35Zr21Cu40Si4 alloy exhibits fully amorphous phase and high thermal stability with a supercooled liquid region (ΔTx) of 80K. The Ca phosphates depositions on alloy surfaces were gained after 15 days. Moreover, n (Ca)/n (P) atom ratio of the deposition is about 1.65/1, which approaches to that of human bone 1.66/1, suggesting that the Ti35Zr21Cu40Si4 amorphous alloy is with an excellent biocompatibility. The Ti35Zr21Cu40Si4 amorphous ribbon has lower hemolysis ratio of 0.562%, which can reduce wrecking degree of erythrocytes, compared with medical standards of the hemolysis rate (less than 5%). These are favorable for application to biomaterials.
A synthesis method for the production of porous bulk metallic glass (BMG) is introduced. This method utilizes the superplastic forming ability of amorphous powder in the supercooled liquid (SCL) state and intenerating salt mixture as a placeholder to produce BMG foam by using a hot die pressing method. Scanning electron microscope (SEM), x-ray diffraction (XRD) and differential scanning calorimetry (DSC) were employed to characterize the morphologies of foaming structure, the crystallization and percentage of amorphous phase of the as-produced porous BMG. The results suggest that the formation of porous structure by superplastic forming process is feasible. Good bonding effect was observed between amorphous powder particles. None of crystalline phases was formed during hot pressing, and less than 3.5% percent of residual salt was enclosed in the foam. In order to remove any residual salt particles, salt preform with three-dimensional network and good connectivity is necessary.
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