|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Microstructural Templates Consisting of Isostructural Ordered Precipitate / Disordered Matrix Combinations: Microstructural Evolution and Properties
||Tuning the Degree of Chemical Ordering in the Solid Solution of a Complex Concentrated Alloy and Its Impact on Mechanical Properties
||Sriswaroop Dasari, Abhinav Jagetia, Abhishek Sharma, M.S.K.K.Y. Nartu, Vishal Soni, Bharat Gwalani, Stephane Gorsse, Rajarshi Banerjee
|On-Site Speaker (Planned)
Using binary enthalpies of mixing in Co-Cr-Fe-Ni base alloy system, a complex concentrated alloy (CCA), the equiatomic CoFeNi has been identified, which should form a random solid solution. Subsequent experimental validation established that this alloy is indeed a near random FCC solid solution. The same thermodynamic basis has been employed to systematically engineer the degree of chemical ordering within the random CoFeNi alloy, from short-range ordering, to long-range ordered domains, by adding controlled amounts of Al and Ti, since these elements have a strong ordering tendency with Co, Fe, and Ni. This change in the degree of chemical ordering has a strong influence on the tensile yield strength of the alloy, ranging from ~181 MPa in case of CoFeNi to ~793 MPa in case of the Al0.3Ti0.2Co0.7FeNi1.7 CCA. These experimentally measured yield strengths of the candidate CCAs are in close agreement with predicted values afforded by simple strengthening models.
||Shaping and Forming, High-Entropy Alloys, Characterization