|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||High Entropy Alloys V
||Bringing High-entropy Alloys Close to High-temperature Applications: Single Crystal Growth, Microstructure Characterization, and Mechanical Tests
||Qingfeng Xing, Haoyan Diao, Deborah L. Schlagel, Trevor M. Riedemann, Peter K. Liaw, Thomas A. Lograsso
|On-Site Speaker (Planned)
A brittle Cr-rich phase segregates at grain boundaries of polycrystalline high-entropy alloys (HEAs) and degrades their creep performance at elevated temperatures. To understand the intrinsic creep-deformation mechanisms, high-quality and large-size HEA single crystals are fabricated by Bridgman growth. The unseeded growth yields an Al<sub>0.3</sub>CoCrFeNi single crystal allowing [1 0 0] and [1 1 0] rods of 6 mm diameter and 25 mm length to be machined from it for in situ deformation observation by neutron diffraction and creep tests. To obtain [1 1 1] and [3 1 1] rods, seeded Bridgman growth are used to make a larger single-crystal ingot with [1 1 0] along the longitude direction. The mechanical properties and detailed microstructures of the single-crystal HEAs are investigated and compared with their counterparts, polycrystalline Al<sub>0.3</sub>CoCrFeNi HEAs. This prototype study will accelerate the application of HEAs at high temperatures and shed light on the future design of creep-resistant HEAs.
||Planned: Supplemental Proceedings volume