Fundamentals of Short-range Order-assisted Alloy Design: Thermodynamics, Kinetics, Mechanics

Project Personnel

Cemal Tasan

Principal Investigator

Massachusetts Institute of Technology (MIT)

Email

Ju Li

Massachusetts Institute of Technology (MIT)

Email

Wojciech Dmowski

University of Tennessee, Knoxville

Email

James LeBeau

Massachusetts Institute of Technology (MIT)

Email

Takeshi Egami

University of Tennessee, Knoxville

Email

Funding Divisions

Civil, Mechanical and Manufacturing Innovation (CMMI), Division of Materials Research (DMR)

This work aims to unravel what controls short-range order stabilities and characteristics, understand fundamentals of short-range order-assisted deformation micro/nano-mechanics, and design novel complex concentrated alloys that overcome current strength and toughness limits. It is necessary to understand how specific aspects of short-range order chemistry, size, and strength can be controlled, and how such variations would influence the interaction with dislocations. To this end, one of the most important challenges is regarding characterization. The typical size of the short-range ordered zones reaches the resolution limits of the conventional microscopy and diffraction tools such as the transmission electron microscopy, the atom probe tomography, and the x-ray diffraction. The research team will employ a novel, multi-pronged approach, combining theoretical modeling (ab-initio density functional theory calculation, Monte-Carlo simulation, and molecular dynamics), metallurgical processing (fabrication & testing), and atomically-resolved advanced structural characterization techniques (resonant x-ray scattering, in-situ scanning electron microscopy, and revolving scanning transmission electron microscopy) in order to overcome this challenge, and to link atomic-scale short-range order-characteristics to engineering properties at the macro-scale.

Publications

Element-resolved local lattice distortion in complex concentrated alloys: An observable signature of electronic effects
H. S. Oh, K. Odbadrakh, Y. Ikeda, S. Mu, F. Kormann, C. J. Sun, H. S. Ahn, K. N. Yoon, D. C. Ma, C. C. Tasan, T. Egami, and E. S. Park
Sep 2021
Achieving room-temperature M2-phase VO2 nanowires for superior thermal actuation
Y. Q. Zhang, K. Chen, H. Shen, Y. C. Wang, M. N. Hedhili, X. X. Zhang, J. Li, and Z. W. Shan
Mar 2021
Origin of micrometer-scale dislocation motion during hydrogen desorption
M. Koyama, S. M. Taheri-Mousavi, H. X. Yan, J. Kim, B. C. Cameron, S. S. Moeini-Ardakani, J. Li, and C. C. Tasan
Jun 2020
Pressureless two-step sintering of ultrafine-grained tungsten
X. Y. Li, L. Zhang, Y. H. Dong, R. Gao, M. L. Qin, X. H. Qu, and J. Li
Mar 2020
Rafting-Enabled Recovery Avoids Recrystallization in 3D-Printing-Repaired Single-Crystal Superalloys
K. Chen, R. Q. Huang, Y. Li, S. C. Lin, W. X. Zhu, N. Tamura, J. Li, Z. W. Shan, and E. Ma
Feb 2020