Date of Award

3-1991

Document Type

Thesis

Degree Name

Master of Science

Department

Department of Engineering Physics

First Advisor

Michael J. Sabochick, Captain, USAF

Abstract

The behavior of the liquid-solid interface during resolidification of a condensed copper-titanium crystal is studied by atomistic simulation. A system of 1080 atoms (540 of each type) was simulated. The interface was created using monte carlo techniques and resolidification was performed by molecular dynamics. Resolidification was attempted at temperatures of 1200 K, 1100 K, 1000 K, 900 K, 818 K and 773 K. The liquid-solid interface was found to move only at 773 K, resulting in a chemically disordered crystal. The interface velocity observed in the simulation is 6.6 m/s which agrees well with the theoretical value of 5.5 m/ s. The low interface velocity indicates the recrystallization is governed by diffusion-limited growth.

AFIT Designator

AFIT-GNE-ENP-91M-4

DTIC Accession Number

ADA238634

Comments

The author's Vita page is omitted

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