| Title |
Microstructure and Mechanical Properties of Cu-based Bulk Amorphous Alloys Fabricated by Spark Plasma Sintering |
| Authors |
김창규(Chang Kyu Kim); 이성학(Sung Hak Lee); 신승용(Seung Yong Shin); 김도향(Do Hyang Kim) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Bulk amorphous alloy; Spark plasma sintering; Consolidation; Crystallization |
| Abstract |
Cu-based bulk amorphous powders were consolidated by a spark plasma sintering (SPS) process. Consolidation conditions such as consolidation temperature, consolidation pressure, and holding time were established to obtain good microstructures and compressive properties. Cu-based amorphous powders were produced by a gas atomization process. Amorphous alloys having a few micropores and nanocrystalline phases could be obtained with a consolidation pressure of 80 MPa, and were fractured in an intergranular mode along prior powder boundaries. Microstructures and compressive properties of the amorphous alloys consolidated with a pressure of 300 MPa were significantly modified as prior amorphous powders were sufficiently bonded without micropores. Fractographic investigation of these alloys indicated that vein patterns appeared on fracture surfaces as amorphous powders were strongly bonded during the high-pressure consolidation. These findings suggested that the high-pressure consolidation was effective in suppressing the crystallization of amorphous phases and in strongly bonding amorphous powders to consolidate good quality amorphous alloys. (Received December 6, 2004) |