Direct observations of nucleation in a nondilute multicomponent alloy

Details Direct observations of nucleation in a nondilute multicomponent alloy Direct observations of nucleation in a nondilute multicomponent alloy

2005-08-04

arxiv.org/abs/cond-mat/0508117v3

PHYSICAL REVIEW B 73, 212101 2006

Physics

Condensed Matter

Materials Science

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.73.212101

The chemical pathways leading to gamma-prime(L1_2)-nucleation from nondilute Ni-5.2 Al-14.2 Cr at.%, gamma(f.c.c.), at 873 K are followed with radial distribution functions and isoconcentration surface analyses of direct-space atom-probe tomographic images. Although Cr atoms initially are randomly distributed, a distribution of congruent Ni3Al short-range order domains (SRO), =0.6 nm, results from Al diffusion during quenching. Domain site occupancy develops as their number density increases leading to Al-rich phase separation by gamma-prime-nucleation, =0.75 nm, after SRO occurs.

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