| Summary: | 碩士 === 國立中央大學 === 機械工程學系 === 103 === Fe-based amorphous alloys, also known as, bulk amorphous steel (BAS), exhibit not only impressive mechanical properties such as high hardness and compressive strengths but also good anti-corrosion and wear resistance. In this
study, several BASs are made of cast iron which reduced the manufacture cost.However, all these BAS materials are extremely brittle and strongly restrict their applications as engineering or structure materials.
The purpose of this study is to enhance the fracture toughness by dispersion strengthening method.. A series of Fe-Cr-Mo-C-B-Co-Y-Ta bulk amorphous steel
composites (BASCs) were successfully fabricated by suction casting.X-ray diffraction(XRD) and differential scanning calorimetry(DSC) are conducted to examine the amorphous structure of these BASCs. Indentation testing and
ultrasonic echography were applied to characterize the mechanical properties of these BASCs. The results show that all Fe-based BASCs present much higher fracture toughness (10.2±0.9 MPa∙m1/2) than the based one (5.13±0.9 MPa∙m^1/2).
The Fe-based BASC further processed into a surgical skin-grafting blade as well as the sputter target to deposit thin film amorphous steel (TFAS) for the investigation of initial grafting ability and durability performance of 15 cmgrafting
path in comparison with commercial one.
Both Fe-based BASC and Fe-based TFAS blades exhibited much lower cutting energy than the commercial one. After 15cm skin-grafting test, the BSI value of BASC and TFAS skin-grafting blade still remain under blunt level
(BSI<0.5), where the commercial one is increased from 0.35 to 0.53, which is considered as a blunt blade.
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