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Title: Microstructural Pattern Formation during Far-from-Equilibrium Alloy Solidification

Journal Article · · Physical Review Letters

We introduce a new phase-field formulation of rapid alloy solidification that quantitatively in- corporates non-equilibrium effects at the solid-liquid interface over a very wide range of interface velocities. Simulations identify a new dynamical instability of dendrite tip growth driven by solute trapping at velocities approaching the absolute stability limit. They also reproduce the formation of the widely observed banded microstructures, revealing how this instability triggers transitions between dendritic and microsegregation-free solidification. Predicted band spacings agree quantita- tively with observations in rapidly solidified Al-Cu thin films.

Research Organization:
Northeastern Univ., Boston, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
Contributing Organization:
Colorado School of Mines
Grant/Contract Number:
SC0020870; FG02-07ER46400
OSTI ID:
1908682
Alternate ID(s):
OSTI ID: 1906280
Journal Information:
Physical Review Letters, Vol. 130, Issue 2; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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