| Autor: |
Rong-Ruey Jeng, Hong-Ming Lin, Pee-Yew Lee |
| Rok vydání: |
2008 |
| Předmět: |
|
| Zdroj: |
Materials Science and Engineering: A. 493:246-250 |
| ISSN: |
0921-5093 |
| DOI: |
10.1016/j.msea.2007.10.085 |
| Popis: |
In the present study, Ti 50 Cu 28 Ni 15 Sn 7 (at.%) metallic glass and its composite powders reinforced with 4-12 vol.% of added SiC were successfully prepared by mechanical alloying. In the ball-milled composites, an amorphous matrix with a homogeneous dispersion of SiC particles was developed. The metallic glass composite powders were found to exhibit a large supercooled liquid region before crystallization. The presence of SiC particles did not change the glass-formation ability of the amorphous Ti 50 Cu 28 Ni 15 Sn 7 powders. Consolidation of the as-milled Ti 50 Cu 28 Ni 15 Sn 7 composite powders was performed at a temperature slightly higher than the glass-transition temperature under a pressure of ∼1.2 GPa; using this method, the bulk metallic glass composite discs were prepared successfully. However, partial crystallization of the amorphous matrix during the hot-pressing process was noticed. The fracture strength of consolidated composite compacts was increased with SiC additions. The pre-existing particle boundaries may serve as the crack initiation sites which resulted in the brittle failure of the Ti 50 Cu 28 Ni 15 Sn 7 BMG composites. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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