期刊
PHYSICAL REVIEW LETTERS
卷 107, 期 17, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.175701
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资金
- NSF
- ARO
- DTRA
- AFOSR
- ISU
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1104518] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [0969143] Funding Source: National Science Foundation
Strong, surprising, and multifaceted effects of the width of the external surface layer Delta(xi) and internal stresses on surface-induced pretransformation and phase transformations (PTs) are revealed. Using our further developed phase-field approach, we found that above some critical Delta*(xi), a morphological transition from fully transformed layer to lack of surface pretransformation occurs for any transformation strain epsilon(t). It corresponds to a sharp transition to the universal (independent of epsilon(t)), strongly increasing the master relationship of the critical thermodynamic driving force for PT X-c on Delta(xi). For large epsilon(t), with increasing Delta(xi), X-c unexpectedly decreases, oscillates, and then becomes independent of epsilon(t). Oscillations are caused by morphological transitions of fully transformed surface nanostructure. A similar approach can be developed for internal surfaces (grain boundaries) and for various types of PTs and chemical reactions.
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