|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Multi-Principal Elements Alloys X
||Effect of composition and processing on the stacking fault energy of a metastable high entropy alloy
||Priyanka Agrawal, Sanya Gupta, Shivakant Shukla, Rajiv S. Mishra
|On-Site Speaker (Planned)
Tailoring the stacking fault energy (SFE) of metastable high entropy alloys (HEAs) that exhibit transformation-induced plasticity (TRIP) has substantial impact on their mechanical properties. In this work, the effect of composition by adding Cu (a γ-fcc phase stabilizer) and processing on SFE was probed via mechanical testing and transmission electron microscopy. Cu addition locally changes the environment to stabilize and increase γ/γ interfaces, increase the fraction of lower width stacking faults (SFs) along with higher interaction of defects (dislocations and SFs) which resulted in delayed TRIP effect due to increased SFE compared to the base alloy. The Cu added HEA was then friction stir processed alloy to alter the effective SFE via processing. The processed alloy resulted in an advanced TRIP effect and thus reduced effective SFE due to the collective effect of increased dislocation density, finer grains, low density of SFs, and increased γ/γ, γ/ε and ε/ε interfaces.
||High-Entropy Alloys, Mechanical Properties, Characterization