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Modeling Abnormal Strain States in Ferroelastic Systems: The Role of Point Defects

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/48126

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Title: Modeling Abnormal Strain States in Ferroelastic Systems: The Role of Point Defects
Creators: Wang, Dong; Wang, Yunzhi; Zhang, Zhen; Ren, Xiaobing
Issue Date: 2010-11-11
Publisher: American Physical Society
Citation: Dong Wang et al, "Modeling Abnormal Strain States in Ferroelastic Systems: The Role of Point Defects," Physical Review Letters 105, no. 20 (2010), doi:10.1103/PhysRevLett.105.205702
DOI: 10.1103/PhysRevLett.105.205702
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.
ISSN: 1079-7114
URI: http://hdl.handle.net/1811/48126
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