Abstract
Microstructural evolution of the Al/Ti bi-metal interface during heat treatment in a spark plasma sintering (SPS) apparatus was investigated under various conditions for the first time. A mechanism of interfacial layer growth was suggested based on the results of SEM, TEM and X-ray diffraction analysis. A continuous TiAl3 intermetallic layer was formed at the Al/Ti interface even after a processing time as short as about a minute. The TiAl3 layer grew mainly into the Ti part, while only a few individual grains grew into the Al part. Evolution of the interlayer was determined by Al diffusion through the (TiAl3/TiAl3) grain boundary. The activation energy of the process was 140 kJ/mol. The shear strength of the interface in the Al/Ti bi-metal was determined after various heat treatments. The shear strength of the bi-metal was limited by the properties of aluminum, with no effect of interlayer thickness or current mode and pulse pattern of the SPS treatment being detected.
| Original language | American English |
|---|---|
| Pages (from-to) | 329-336 |
| Number of pages | 8 |
| Journal | Journal of Alloys and Compounds |
| Volume | 678 |
| DOIs | |
| State | Published - 5 Sep 2016 |
Keywords
- Diffusion
- Intermetallics
- Mechanical properties
- Metals and alloys
- Solid-state reactions
- Transmission electron microscopy
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry