Metallurgical and Materials Transactions A

, Volume 42, Issue 8, pp 2456–2465

Favorable Environment for a Nondendritic Morphology in Controlled Diffusion Solidification

Article

DOI: 10.1007/s11661-011-0641-z

Cite this article as:
Khalaf, A.A. & Shankar, S. Metall and Mat Trans A (2011) 42: 2456. doi:10.1007/s11661-011-0641-z

Abstract

The novelty of the controlled diffusion solidification (CDS) process is the mixing of two precursor alloys with different thermal masses to obtain the resultant desired alloy, which is subsequently cast into a near-net-shaped product. The critical event in the CDS process is the ability to generate a favorable environment during the mixing of the two precursor alloys to enable a well-distributed and copious nucleation event of the primary Al phase leading to a nondendritic morphology in the cast part. The turbulence dissipation energy coupled with the undercooling of the precursor alloy with the higher temperature enables the copious nucleation events, which are well distributed in the resultant mixture.

Nomenclature

Alloy 1

precursor alloy with higher thermal mass (higher temperature and higher mass)

Alloy 2

precursor alloy with lower thermal mass

Alloy 3

resultant desired alloy

C1 and C2

average solute concentration of Alloys 1 and 2, respectively

CCu

transient solute concentration (Cu)

f

final

L

characteristic length

m1, m2, and mT

mass of Alloy 1, Alloy 2, and total mass, respectively

NWe

Weber number

S/L

solid-liquid interface

T1 and T2

temperatures of Alloys 1 and 2, respectively

Tactual

actual temperature

TB

temperature of point B

TL1, TL2, TL3

liquidus temperatures of Alloys 1, 2, and 3, respectively

Tm

melting temperature

Tquench

quenching temperature

u

velocity

ξ

transient instantaneous position

ρ

density

μ

dynamic viscosity

σ

surface tension

Copyright information

© The Minerals, Metals & Materials Society and ASM International 2011

Authors and Affiliations

  1. 1.The Light Metal Casting Research Centre (LMCRC), Department of Mechanical EngineeringMcMaster UniversityHamiltonCanada