Abstract
Recent studies showed that nanotwinned Al/Ti multilayers have outstanding mechanical properties at room temperature. However, the thermal stability of these multilayers remains unclear. Here, we show that after annealing at 400 °C, nanotwinned Al/Ti multilayers demonstrate excellent thermal stability and limited intermixing when individual layer thickness exceeds 22 nm. Whereas nanolayers of TiAl formed in the annealed Al/Ti 4.5 nm multilayer. Annealing induced substantial hardening, and the magnitude of hardening is greater at smaller layer thickness. In situ micropillar compression tests show the annealed Al/Ti multilayers have high flow stress (exceeding 3 GPa), work hardening capability, and good deformability.
Original language | English |
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Pages (from-to) | 219-224 |
Number of pages | 6 |
Journal | Scripta Materialia |
Volume | 186 |
DOIs | |
State | Published - Sep 2020 |
Externally published | Yes |
Funding
This work is supported by the DoE-BES (DOE Award number: DE-SC0016337). The authors also acknowledge the accesses to the Microscopy Facilities at Purdue University and Center for Integrated Nanotechnologies (managed by Los Alamos National Laboratory). This work is supported by the DoE-BES (DOE Award number: DE-SC0016337). The authors also acknowledge the accesses to the Microscopy Facilities at Purdue University and Center for Integrated Nanotechnologies (managed by Los Alamos National Laboratory).
Keywords
- Al/Ti multilayers
- In situ micropillar compression
- Thermal stability