Phase field approach to phase transformations, dislocations, and their interaction at nano- and microscales
Interaction between phase transformations (PTs) and dislocations determines transformational and elastoplastic material behavior during various technological processes and processes in nature, physical experiments, and use of structural elements in machine and devices. The following recent results on phase field approach (PFA) modeling of PTs, dislocation evolution, and their interaction at the nano- and microscales will be discussed:
+ New PFA to the martensitic PTs that satisfies crystal lattice instability conditions under action of the all six components of the stress tensor obtained from the atomistic simulations.
+ The PFA to the martensitic PTs is combined with the previously developed PFA to dislocation evolution with corresponding interaction terms.
+ Scale-free PFA to the martensitic PTs, which does not include gradient energy and regularization of the problem is achieved through kinetic equations for concentration of martensitic variants.
+ Scale-free approach to discrete dislocation evolution.
+ Various problems on interaction between PTs and dislocations are solved using finite element method and utilized to interpret experimental phenomena and results. The major application is to the description of the drastic effect of plastic shear on the high-pressure PTs.
References
Prof. Valery I. Levitas
Vance Coffman Faculty Chair Professor, Aerospace Engineering
Mechanical Engineering (Secondary)
Materials Science and Engineering (Courtesy)
Faculty Scientist at Ames Laboratory
Iowa State University
Department of Aerospace Engineering
2351 Howe Hall
Ames, IA 50011
USA
| Phone | +01 515 294 9691 |
| Fax | +01 801 788 0026 |
| Prof. V. I. Levitas | |
| Http | Prof. V. I. Levitas |
| Iowa Sate University |