Document Type

Article

Publication Date

10-19-2011

Journal or Book Title

Physical Review Letters

Volume

107

Issue

17

First Page

175701

DOI

10.1103/PhysRevLett.107.175701

Abstract

Strong, surprising, and multifaceted effects of the width of the external surface layer Δξ 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 Δξ*, a morphological transition from fully transformed layer to lack of surface pretransformation occurs for any transformation strain εt. It corresponds to a sharp transition to the universal (independent of εt), strongly increasing the master relationship of the critical thermodynamic driving force for PT Xc on Δξ. For large εt, with increasing Δξ, Xcunexpectedly decreases, oscillates, and then becomes independent of εt. 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.

Comments

This article is from Physical Review Letters 107 (2011): 175701, doi:10.1103/PhysRevLett.107.175701. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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