|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Multi-Principal Elements Alloys X
||Ultrafast multilayer combustion synthesis of B2 single phase AlCoCrFeNi high entropy alloy films using reactive Al/Ni multilayer as heat source
||Anni Wang, Isabella Gallino, Sascha Sebastian Riegler, Yi-Ting Lin, Nishchay Angel Isaac, Yesenia Haydee Sauni Camposano, Sebastian Matthes, Dominik Flock, Heiko O Jacobs, Hung-Wei Yen, Peter Schaaf
|On-Site Speaker (Planned)
We present here a new method to produce ultrafine single B2 phase high-entropy alloy films (HEAF) with equiatomic AlCoCrFeNi composition . The method consists of stacking three multilayer thin films together, i.e., two Al/Ni films (Ni/Al units) between a CrNi/Al/CoFe (HEAF units) film.
A fast scanning calorimetry (FSC) study revealed that when this triple stack Al/Ni–HEAF–Ni/Al composite is heated using flash rates in the order of 10,000 K/s a thermal explosion occurs at 700 K, forming an homogeneous single B2 phase. This reaction resembles the thermal explosion that is typically observed in electrical sparks ignited films, where the multistep phase sequence that is observed during slow annealing is kinetically suppressed altogether. A detailed kinetic analysis provided values for the activation energies of the exothermic reaction evolution.
 A. Wang et al., Materials & Design 206 (2021)109790.
||High-Entropy Alloys, Thin Films and Interfaces,