No Cover Image

Journal article 561 views 80 downloads

On the microstructural refinement in commercial purity Al and Al-10 wt% Cu alloy under ultrasonication during solidification / H.R. Kotadia, M. Qian, D.G. Eskin, Amit Das

Materials & Design, Volume: 132, Pages: 266 - 274

Swansea University Author: Amit Das

Abstract

Physical grain refinement is examined under high-intensity ultrasonication during solidification in commercial purity Al (CP-Al) and binary Al-10 wt% Cu alloy melts cooled naturally in air and compared against chemical inoculation using Al-5Ti-1B grain refiner. The coarse dendritic unrefined base mi...

Full description

Published in: Materials & Design
ISSN: 0264-1275
Published: 2017
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa34522
Tags: Add Tag
No Tags, Be the first to tag this record!
Abstract: Physical grain refinement is examined under high-intensity ultrasonication during solidification in commercial purity Al (CP-Al) and binary Al-10 wt% Cu alloy melts cooled naturally in air and compared against chemical inoculation using Al-5Ti-1B grain refiner. The coarse dendritic unrefined base microstructure was completely replaced with a fine equiaxed grain structure in the case of either inoculation or ultrasonication. However, ultrasonication produced more effective refinement over chemical inoculation with a two-fold and eight-fold increase in the grain density in CP-Al and Al-10%Cu alloy, respectively. While combining chemical inoculation with ultrasonication produced the finest grain structure in CP-Al, no further improvement over ultrasonication was noted for the Al-10%Cu alloy. Noticeable reduction in nucleation undercooling, of similar magnitude to chemical inoculation, was observed under ultrasonication. Cooling curve observations indicate strongly enhanced heterogeneous nucleation under ultrasonication. It appears that although chemical inoculation utilises higher potency nucleants, more nucleation events are favoured under cavitation.
Keywords: Grain refining; Ultrasound; Cavitation; Al-Ti-B refiner; Aluminium alloys; Solidification microstructure
College: College of Engineering
Start Page: 266
End Page: 274