In-situ observations and acoustic measurements upon fragmentation of free-floating intermetallics under ultrasonic cavitation in water

Grain refinement in alloys is a well-known effect of ultrasonic melt processing. Fragmentation of primary crystals by cavitation-induced action in liquid metals is considered as one of the main driving mechanisms for producing finer and equiaxed grain structures. However, in-situ observations of the...

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Autores principales:	Abhinav Priyadarshi, Mohammad Khavari, Shazamin Bin Shahrani, Tungky Subroto, Lukman A. Yusuf, Marcello Conte, Paul Prentice, Koulis Pericleous, Dmitry Eskin, Iakovos Tzanakis
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Grain refinement Primary intermetallic crystal Fragmentation time High-speed imaging Free-floating Chemistry QD1-999 Acoustics. Sound QC221-246
Acceso en línea:	https://doaj.org/article/4e7b467e1aff45bb806661471b01f5c5
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id	oai:doaj.org-article:4e7b467e1aff45bb806661471b01f5c5
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spelling	oai:doaj.org-article:4e7b467e1aff45bb806661471b01f5c52021-12-02T04:59:50ZIn-situ observations and acoustic measurements upon fragmentation of free-floating intermetallics under ultrasonic cavitation in water1350-417710.1016/j.ultsonch.2021.105820https://doaj.org/article/4e7b467e1aff45bb806661471b01f5c52021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S135041772100362Xhttps://doaj.org/toc/1350-4177Grain refinement in alloys is a well-known effect of ultrasonic melt processing. Fragmentation of primary crystals by cavitation-induced action in liquid metals is considered as one of the main driving mechanisms for producing finer and equiaxed grain structures. However, in-situ observations of the fragmentation process are generally complex and difficult to follow in opaque liquid metals, especially for the free-floating crystals. In the present study, we develop a transparent test rig to observe in real time the fragmentation potential of free-floating primary Al3Zr particles under ultrasonic excitation in water (an established analogue medium to liquid aluminium for cavitation studies). An effective treatment domain was identified and fragmentation time determined using acoustic pressure field mapping. For the first time, real-time high-speed imaging captured the dynamic interaction of shock waves from the collapsing bubbles with floating intermetallic particles that led to their fragmentation. The breakage sequence as well as the cavitation erosion pattern were studied by means of post-treatment microscopic characterisation of the fragments. Fragment size distribution and crack patterns on the fractured surface were then analysed and quantified. Application of ultrasound is shown to rapidly (<10 s) reduce intermetallic size (from 5 mm down to 10 μm), thereby increasing the number of potential nucleation sites for the grain refinement of aluminium alloys during melt treatment.Abhinav PriyadarshiMohammad KhavariShazamin Bin ShahraniTungky SubrotoLukman A. YusufMarcello ContePaul PrenticeKoulis PericleousDmitry EskinIakovos TzanakisElsevierarticleGrain refinementPrimary intermetallic crystalFragmentation timeHigh-speed imagingFree-floatingChemistryQD1-999Acoustics. SoundQC221-246ENUltrasonics Sonochemistry, Vol 80, Iss , Pp 105820- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Grain refinement Primary intermetallic crystal Fragmentation time High-speed imaging Free-floating Chemistry QD1-999 Acoustics. Sound QC221-246
spellingShingle	Grain refinement Primary intermetallic crystal Fragmentation time High-speed imaging Free-floating Chemistry QD1-999 Acoustics. Sound QC221-246 Abhinav Priyadarshi Mohammad Khavari Shazamin Bin Shahrani Tungky Subroto Lukman A. Yusuf Marcello Conte Paul Prentice Koulis Pericleous Dmitry Eskin Iakovos Tzanakis In-situ observations and acoustic measurements upon fragmentation of free-floating intermetallics under ultrasonic cavitation in water
description	Grain refinement in alloys is a well-known effect of ultrasonic melt processing. Fragmentation of primary crystals by cavitation-induced action in liquid metals is considered as one of the main driving mechanisms for producing finer and equiaxed grain structures. However, in-situ observations of the fragmentation process are generally complex and difficult to follow in opaque liquid metals, especially for the free-floating crystals. In the present study, we develop a transparent test rig to observe in real time the fragmentation potential of free-floating primary Al3Zr particles under ultrasonic excitation in water (an established analogue medium to liquid aluminium for cavitation studies). An effective treatment domain was identified and fragmentation time determined using acoustic pressure field mapping. For the first time, real-time high-speed imaging captured the dynamic interaction of shock waves from the collapsing bubbles with floating intermetallic particles that led to their fragmentation. The breakage sequence as well as the cavitation erosion pattern were studied by means of post-treatment microscopic characterisation of the fragments. Fragment size distribution and crack patterns on the fractured surface were then analysed and quantified. Application of ultrasound is shown to rapidly (<10 s) reduce intermetallic size (from 5 mm down to 10 μm), thereby increasing the number of potential nucleation sites for the grain refinement of aluminium alloys during melt treatment.
format	article
author	Abhinav Priyadarshi Mohammad Khavari Shazamin Bin Shahrani Tungky Subroto Lukman A. Yusuf Marcello Conte Paul Prentice Koulis Pericleous Dmitry Eskin Iakovos Tzanakis
author_facet	Abhinav Priyadarshi Mohammad Khavari Shazamin Bin Shahrani Tungky Subroto Lukman A. Yusuf Marcello Conte Paul Prentice Koulis Pericleous Dmitry Eskin Iakovos Tzanakis
author_sort	Abhinav Priyadarshi
title	In-situ observations and acoustic measurements upon fragmentation of free-floating intermetallics under ultrasonic cavitation in water
title_short	In-situ observations and acoustic measurements upon fragmentation of free-floating intermetallics under ultrasonic cavitation in water
title_full	In-situ observations and acoustic measurements upon fragmentation of free-floating intermetallics under ultrasonic cavitation in water
title_fullStr	In-situ observations and acoustic measurements upon fragmentation of free-floating intermetallics under ultrasonic cavitation in water
title_full_unstemmed	In-situ observations and acoustic measurements upon fragmentation of free-floating intermetallics under ultrasonic cavitation in water
title_sort	in-situ observations and acoustic measurements upon fragmentation of free-floating intermetallics under ultrasonic cavitation in water
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/4e7b467e1aff45bb806661471b01f5c5
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In-situ observations and acoustic measurements upon fragmentation of free-floating intermetallics under ultrasonic cavitation in water

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