Novel Mixed-Mode Phase Transition Involving A Composition-Dependent Displacive Component
PHYSICAL REVIEW LETTERS(2011)
Abstract
Solid-solid displacive, structural phase transformations typically undergo a discrete structural change from a parent to a product phase. Coupling electron microscopy, three-dimensional atom probe, and first-principles computations, we present the first direct evidence of a novel mechanism for a coupled diffusional-displacive transformation in titanium-molybdenum alloys wherein the displacive component in the product phase changes continuously with changing composition. These results have implications for other transformations and cannot be explained by conventional theories.
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Key words
phase transition,electron microscopy,phase change,scanning electron microscopy,structural change,titanium,three dimensional,first principle,scanning tunneling microscopy
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