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

Journal Article · Tue Jun 22 04:00:00 EDT 1999 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(99)00111-1· OSTI ID:6436294

Schilling, P J; He, J H; Tittsworth, R C; Ma, E ^[1]

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1. Louisiana State Univ., Baton Rouge, LA (United States). Center for Advanced Microstructures and Devices

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[sub 100[minus]x]Fe[sub 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.

• OSTI ID: 6436294
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Vol. 47:8; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
CHEMICAL COMPOSITION
COPPER ALLOYS
CRYSTAL-PHASE TRANSFORMATIONS
DISPERSIONS
IRON ALLOYS
MACHINING
MILLING
MIXTURES
PHASE STUDIES
PHASE TRANSFORMATIONS
SOLID SOLUTIONS
SOLUBILITY
SOLUTIONS