TY - JOUR
T1 - Simultaneous segregation at coherent and semicoherent heterophase interfaces
AU - Biswas, Aniruddha
AU - Siegel, Donald J.
AU - Seidman, David N.
PY - 2010/8/13
Y1 - 2010/8/13
N2 - By employing a combination of three-dimensional atom-probe tomography and first-principles calculations, significant qualitative and quantitative differences in solute segregation at coherent and semicoherent interfaces bounding a single θ′ precipitate in an Al-Cu-based alloy are found. Qualitatively, localized segregation is observed at the semicoherent interface, whereas delocalized behavior is present at the coherent facets. Quantitatively, segregation at the semicoherent interface is a factor of 2 greater than at the coherent interface, resulting in a decrease in interfacial energy that is more than 5 times greater than that observed at the coherent facet. These observations illustrate unambiguously the strong couplings among interface structure, chemical composition, and energetics.
AB - By employing a combination of three-dimensional atom-probe tomography and first-principles calculations, significant qualitative and quantitative differences in solute segregation at coherent and semicoherent interfaces bounding a single θ′ precipitate in an Al-Cu-based alloy are found. Qualitatively, localized segregation is observed at the semicoherent interface, whereas delocalized behavior is present at the coherent facets. Quantitatively, segregation at the semicoherent interface is a factor of 2 greater than at the coherent interface, resulting in a decrease in interfacial energy that is more than 5 times greater than that observed at the coherent facet. These observations illustrate unambiguously the strong couplings among interface structure, chemical composition, and energetics.
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U2 - 10.1103/PhysRevLett.105.076102
DO - 10.1103/PhysRevLett.105.076102
M3 - Article
C2 - 20868060
AN - SCOPUS:77955601955
SN - 0031-9007
VL - 105
JO - Physical review letters
JF - Physical review letters
IS - 7
M1 - 076102
ER -