Two-phase coexistence region in mechanically alloyed Cu-Fe: An X-ray absorption near-edge structure study

P. J. Schilling; J. H. He; R. C. Tittsworth; E. Ma

doi:10.1016/S1359-6454(99)00111-1

Two-phase coexistence region in mechanically alloyed Cu-Fe: An X-ray absorption near-edge structure study

P. J. Schilling
, J. H. He
, R. C. Tittsworth
, E. Ma

Louisiana State University

Research output: Contribution to journal › Article › peer-review

48 Scopus citations

Abstract

A new technique using the X-ray absorption near-edge structure (XANES) has been developed to simultaneously determine the compositions and phase fractions of the two coexisting (f.c.c. and b.c.c.) supersaturated solid solutions in mechanically alloyed Cu_100-xFe_x (x = 50-80) formed by ball milling under cryogenic conditions. The XANES analysis indicates that throughout this region the two coexistent phases have almost identical composition, consistent with that of the overall mixture. This represents a novel two-phase coexistence representing a region of overlap in solubility rather than the normal miscibility gap. A mechanism is proposed to explain the nature of this two-phase region in terms of extended solubility induced by ball milling, the free energies of the two phases including defect enthalpies, and nucleation and growth barriers for the b.c.c.-f.c.c. (and f.c.c.-b.c.c.) transformation.

Original language	English
Pages (from-to)	2525-2537
Number of pages	13
Journal	Acta Materialia
Volume	47
Issue number	8
DOIs	https://doi.org/10.1016/S1359-6454(99)00111-1
State	Published - 22 Jun 1999
Externally published	Yes

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title = "Two-phase coexistence region in mechanically alloyed Cu-Fe: An X-ray absorption near-edge structure study",

abstract = "A new technique using the X-ray absorption near-edge structure (XANES) has been developed to simultaneously determine the compositions and phase fractions of the two coexisting (f.c.c. and b.c.c.) supersaturated solid solutions in mechanically alloyed Cu100-xFex (x = 50-80) formed by ball milling under cryogenic conditions. The XANES analysis indicates that throughout this region the two coexistent phases have almost identical composition, consistent with that of the overall mixture. This represents a novel two-phase coexistence representing a region of overlap in solubility rather than the normal miscibility gap. A mechanism is proposed to explain the nature of this two-phase region in terms of extended solubility induced by ball milling, the free energies of the two phases including defect enthalpies, and nucleation and growth barriers for the b.c.c.-f.c.c. (and f.c.c.-b.c.c.) transformation.",

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year = "1999",

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T1 - Two-phase coexistence region in mechanically alloyed Cu-Fe

T2 - An X-ray absorption near-edge structure study

AU - Schilling, P. J.

AU - He, J. H.

AU - Tittsworth, R. C.

AU - Ma, E.

PY - 1999/6/22

Y1 - 1999/6/22

N2 - A new technique using the X-ray absorption near-edge structure (XANES) has been developed to simultaneously determine the compositions and phase fractions of the two coexisting (f.c.c. and b.c.c.) supersaturated solid solutions in mechanically alloyed Cu100-xFex (x = 50-80) formed by ball milling under cryogenic conditions. The XANES analysis indicates that throughout this region the two coexistent phases have almost identical composition, consistent with that of the overall mixture. This represents a novel two-phase coexistence representing a region of overlap in solubility rather than the normal miscibility gap. A mechanism is proposed to explain the nature of this two-phase region in terms of extended solubility induced by ball milling, the free energies of the two phases including defect enthalpies, and nucleation and growth barriers for the b.c.c.-f.c.c. (and f.c.c.-b.c.c.) transformation.

AB - A new technique using the X-ray absorption near-edge structure (XANES) has been developed to simultaneously determine the compositions and phase fractions of the two coexisting (f.c.c. and b.c.c.) supersaturated solid solutions in mechanically alloyed Cu100-xFex (x = 50-80) formed by ball milling under cryogenic conditions. The XANES analysis indicates that throughout this region the two coexistent phases have almost identical composition, consistent with that of the overall mixture. This represents a novel two-phase coexistence representing a region of overlap in solubility rather than the normal miscibility gap. A mechanism is proposed to explain the nature of this two-phase region in terms of extended solubility induced by ball milling, the free energies of the two phases including defect enthalpies, and nucleation and growth barriers for the b.c.c.-f.c.c. (and f.c.c.-b.c.c.) transformation.

UR - https://www.scopus.com/pages/publications/0032633030

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DO - 10.1016/S1359-6454(99)00111-1

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JO - Acta Materialia

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IS - 8

ER -

Two-phase coexistence region in mechanically alloyed Cu-Fe: An X-ray absorption near-edge structure study

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