On the subsurface erosion, micro-tunneling and deformation induced by high-frequency droplet impingement in gravity-cast aluminum, analyzed through micro-computed tomography

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F25%3A00641654" target="_blank" >RIV/68081723:_____/25:00641654 - isvavai.cz</a>

Alternative codes found

RIV/68145535:_____/25:00641654 RIV/60460709:41310/25:101884 RIV/61989100:27230/25:10259499

Result on the web

<a href="https://doi.org/10.1016/j.rineng.2025.105669" target="_blank" >https://doi.org/10.1016/j.rineng.2025.105669</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.rineng.2025.105669" target="_blank" >10.1016/j.rineng.2025.105669</a>

Result language

angličtina

Original language name

On the subsurface erosion, micro-tunneling and deformation induced by high-frequency droplet impingement in gravity-cast aluminum, analyzed through micro-computed tomography

Original language description

This research focuses on monitoring the erosion evolution of 99.8 % pure, gravity-cast aluminum, utilized in its basic, un-processed state, when subjected to precisely timed, high-frequency droplet impacts. The investigation aims to ascertain if subsurface micro-tunneling occurs with repeated impacts at a single point. Additionally, the study seeks to understand the development of micro-tunneling over time and the mechanics of subsurface penetration. The material, in its raw state devoid of any processing history, was subjected to an ultrasonic pulsating water jet (PWJ) at a fundamental frequency of f = 40 kHz and a supply pressure of p = 20 MPa. The specimen, pre-examined by micro-CT, underwent varying PWJ exposure, ranging from 0.125 s to 1.25 s. Erosion metrics such as the volume of material extruded above the treated surface, the volume of material removed, maximum depth, and subsurface micro-tunneling were derived from X-ray μ-CT analysis. The measurement results showed that for the increasing time interval from t = 0.125 to 1.25 s, the maximum depth increased from 0.118 mm to 0.75 mm and 0.085 mm to 1.565 mm as measured from confocal and X-ray μ-CT, respectively. Similarly, the eroded volume removed increased from 82.73 mm3 to 3408.28 mm3 and 79.86 mm3 to 10,256.8 mm3 as measured from confocal and X-ray μ-CT, respectively. The results showed a clear differentiation between both measurement techniques. The μ-CT observations showed early signs of micro-tunneling during short exposures to the PWJ. In many cases, exit vents emerged at a considerable distance from the point of contact. The micro-tunnel channels appeared straight and narrowed progressively. Micro-channels that undercut the material and re-emerged on the surface were identified. Further scrutiny was conducted through microhardness testing, particularly detecting potential hardening near the micro-tunnels. SEM analysis showed that entry points of penetration predominantly occurred along the edges of the erosion groove.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Results in Engineering

ISSN

2590-1230

e-ISSN

2590-1230

Volume of the periodical

27

Issue of the periodical within the volume

September 2025

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

17

Pages from-to

105669

UT code for WoS article

001512874100001

EID of the result in the Scopus database

2-s2.0-105008134573