|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Multi-Principal Elements Alloys X
||Magnetron co-sputtering synthesis and nanoindentation studies of nanocrystalline (TiZrHf)x(NbTa)1-x high-entropy alloy thin films
||Changjun Cheng, Yu Zou
|On-Site Speaker (Planned)
Refractory high-entropy alloys (HEAs) possess many useful properties such as high strength and high-temperature stability, while most studies have been limited to a few well-known compositions and on their coarse-grain bulk states. In response, we fabricate nanocrystalline body-centered cubic (bcc) (TiZrHf)x(NbTa)1-x HEA thin films within wide-range compositions (x = 0.07-0.90) by magnetron co-sputtering and measure their mechanical properties using nanoindentation. As the compositional ratio (x) increases, the elastic modulus decreases from 153 GPa to 123 GPa, following the trend of the rule of mixture; As x increases, the hardness first decreases from 6.5 GPa (x = 0.7) to the lowest value (4.6 GPa, x = 4.8) and then increases to the highest one (7.1 GPa, x = 0.90), showing a concave trend. The change of the hardness might be attributed to the combinational influence from the atomic size and modulus effects as well as the texture effect.
||High-Entropy Alloys, Thin Films and Interfaces, Mechanical Properties