Interfaces between a Ni59Zr20Ti16Si2Sn3 bulk metallic glass (BMG) and crystalline brass reinforcements were characterized using transmission electron microscopy and nanoindentation. An interfacial layer with a thickness of ∼50-100 nm was observed in the composite prepared by warm extrusion of gas atomized powders. Microstructural characterization and chemical analysis suggest that the formation of interfacial layer was caused by interdiffusion between the BMG and brass during the warm extrusion. Nanoindentation in the vicinity of BMG-brass interfaces does not cause interface decohesion or crack formation, suggesting a strong interface bonding. Apparently, the resultant interfacial layer not only enhances interfacial bonding but also provides a buffer zone to prevent the catastrophic shear band propagation in the BMG matrix.
Bibliographical noteFunding Information:
This work was sponsored by a “Grant-in-Aid for Scientific Research in Priority Areas: Materials Science of Bulk Metallic Glasses”; “Global COE for Materials Science”, and the project “World Premier International Research Center (WPI) for Atoms, Molecules and Materials”, the Ministry of Education, Culture, Sports, and Science, Japan. T.G.N. thanks the support from the Division of Materials Science and Engineering, Office of Basic Energy Science, US Department of Energy under Contract No. DE-FG02-06ER46338 with the University of Tennessee.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Polymers and Plastics
- Metals and Alloys