Enhancement of Mechanical Properties of Pure Aluminium through Contactless Melt Sonicating Treatment

Author:

Dybalska AgnieszkaORCID,Caden Adrian,Griffiths William D.,Nashwan Zakareya,Bojarevics Valdis,Djambazov Georgi,Tonry Catherine E. H.,Pericleous Koulis A.ORCID

Abstract

A new contactless ultrasonic sonotrode method was previously designed to provide cavitation conditions inside liquid metal. The oscillation of entrapped gas bubbles followed by their final collapse causes extreme pressure changes leading to de-agglomeration and the dispersion of oxide films. The forced wetting of particle surfaces and degassing are other mechanisms that are considered to be involved. Previous publications showed a significant decrease in grain size using this technique. In this paper, the authors extend this research to strength measurements and demonstrate an improvement in cast quality. Degassing effects are also interpreted to illustrate the main mechanisms involved in alloy strengthening. The mean values and Weibull analysis are presented where appropriate to complete the data. The test results on cast Al demonstrated a maximum of 48% grain refinement, a 28% increase in elongation compared to 16% for untreated material and up to 17% increase in ultimate tensile strength (UTS). Under conditions promoting degassing, the hydrogen content was reduced by 0.1 cm3/100 g.

Funder

EPSRC

University of Birmingham

University of Greenwich

EC ExoMet Project

Publisher

MDPI AG

Subject

General Materials Science

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