Accession Number:

ADA238634

Title:

A Study of the Liquid-Solid Interface during Rapid Resolidification of Cooper-Titanium Using Molecular Dynamics

Descriptive Note:

Master's thesis,

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s):

Report Date:

1991-03-01

Pagination or Media Count:

56.0

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 ms 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.

Subject Categories:

  • Crystallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE