title: Modeling abnormal strain states in ferroelastic systems: the role of point defects.
abstract: Recent experiments have revealed a rich variety of strain states in doped ferroelastic systems. We study the origin of two abnormal strain states; precursory tweed and strain glass, and their relationship with the well-known austenite and martensite (the para- and ferroelastic states). A Landau free energy model is proposed, which assumes that point defects alter the global thermodynamic stability of martensite and create local lattice distortions that interact with the strain order parameters and break the symmetry of the Landau potential. Phase field simulations based on the model have predicted all the important signatures of a strain glass found in experiment. Moreover, the generic "phase diagram" constructed from the simulation results shows clearly the relationships among all the strain states, which agrees well with experimental measurements.
authors.affiliation: Center for Computational Study of Microstructure Evolution in Materials and Multi-Disciplinary Materials Research Center, Frontier Institute of Science and Technology, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China. wang.363@osu.edu
authors.forename: Dong
authors.initials: D
authors.lastname: Wang
authors.forename: Yunzhi
authors.initials: Y
authors.lastname: Wang
authors.forename: Zhen
authors.initials: Z
authors.lastname: Zhang
authors.forename: Xiaobing
authors.initials: X
authors.lastname: Ren