Cavitation erosion of aluminium alloys

Tomlinson, W. J.; Matthews, Steven

doi:10.1007/bf00351438

Cited by 34 publications

(27 citation statements)

References 9 publications

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“…Transient cavitation is characterized by the initially explosive growth of a cavity from a small, stabilized bubble or gas pocket, followed by an appropriately energetic collapse in response to the pressure variation or stress ͑Leighton, 1994͒. Such collapses are high-energy events and can generate a wide range of potentially destructive effects ͓e.g., erosion ͑Lush and Angell 1984; Belahadji et al, 1991;Tomlinson and Matthews, 1994;Phillip and Ohl, 1995;Phillip and Lauterborn, 1998;Smith andHynynen 1998͒, cell disruption ͑Jarman andTaylor, 1965;Dunn andFry, 1971͒, andsonoluminescence ͑Ohl et al, 1998;Ohl, 2000;Chakravarty and Walton, 2001͔͒. Acoustic backscatter of the insonating sound field is often used to monitor cavitation. Researchers have successfully demonstrated the sudden increase of backscattering signals from cavitating bubbles after insonifying with highamplitude ultrasound pulses ͑Fairbank and Scully, 1977; Roy et al, 1985;Atchley et al, 1988;Holland and Apfel, 1990;Roy et al, 1990a;1990b;Madanshetty et al, 1991;Bouakaz et al, 1999;Shi et al, 2000;Chen et al, 2002͒.…”

Section: Introductionmentioning

confidence: 98%

Controlled ultrasound tissue erosion: The role of dynamic interaction between insonation and microbubble activity

Fowlkes

Rothman

et al. 2005

The Journal of the Acoustical Society of America

179

159

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Previous studies showed that ultrasound can mechanically remove tissue in a localized, controlled manner. Moreover, enhanced acoustic backscatter is highly correlated with the erosion process. "Initiation" and "extinction" of this highly backscattering environment were studied in this paper. The relationship between initiation and erosion, variability of initiation and extinction, and effects of pulse intensity and gas saturation on time to initiation (initiation delay time) were investigated. A 788-kHz single-element transducer was used. Multiple pulses at a 3-cycle pulse duration and a 20-kHz pulse repetition frequency were applied. I(SPPA) values between 1000 and 9000 W/cm2 and gas saturation ranges of 24%-28%, 39%-49%, and 77%-81% were tested. Results show the following: (1) without initiation, erosion was never observed; (2) initiation and extinction of the highly backscattering environment were stochastic in nature and dependent on acoustic parameters; (3) initiation delay times were shorter with higher intensity and higher gas saturation (e.g., the mean initiation delay time was 66.9 s at I(SPPA) of 4000 W/cm2 and 3.6 ms at I(SPPA) of 9000 W/cm2); and (4) once initiated by high-intensity pulses, the highly backscattering environment and erosion can be sustained using a significantly lower intensity than that required to initiate the process.

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Section: Introductionmentioning

confidence: 98%

Controlled ultrasound tissue erosion: The role of dynamic interaction between insonation and microbubble activity

Fowlkes

Rothman

et al. 2005

The Journal of the Acoustical Society of America

179

159

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“…Concerning the family of wrought alloys, various alloys belonging to the Al-Cu, Al-Mg, Al-Si-Mg or Al-Zn-Mg families were tested in different conditions [14,17] taking also into account the influence of real erosion environments, as for instance the presence of aggressive fluids or slurries [8,18]. For casting alloys, in general, it was found that Al alloys resistance is strongly affected by several microstructural properties, as such as grain size, number of interfaces between different phases, presence and morphology of secondary phases [14][15][19][20]. This is not surprising since various studies report the influence of eutectic [21][22] and intermetallic phase [23][24][25], as well as the role of grain size [26][27], on other mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, it is well known that a proper choice of heat treatment parameters can increase several mechanical properties [31][32][33]. For this reason, the influence of heat treatment on cavitation resistance was investigated and various studies demonstrated the beneficial contribution of age hardening on reducing material damage [14,[19][20]. Considering the erosion mechanism, under continuous exposure to cavitation, it is reported in scientific literature that the initial undulations of the exposed surface gradually develop into craters and material is lost by necking of the rims of the craters, flaking and dislodging of secondary phases [1,3,14,19].…”

Section: Introductionmentioning

confidence: 99%

“…For this reason, the influence of heat treatment on cavitation resistance was investigated and various studies demonstrated the beneficial contribution of age hardening on reducing material damage [14,[19][20]. Considering the erosion mechanism, under continuous exposure to cavitation, it is reported in scientific literature that the initial undulations of the exposed surface gradually develop into craters and material is lost by necking of the rims of the craters, flaking and dislodging of secondary phases [1,3,14,19]. Hence, it appears evident a dependency of cavitationerosion behavior on the alloy microstructure, not simply related to the heat treatment effect.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of cavitation erosion resistance of Al-Si casting alloys: effect of eutectic and intermetallic phases

Tocci

Pola

Montesano

et al. 2017

Frattura Ed Integrità Strutturale

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In the present paper, the influence of eutectic and intermetallic phases on cavitation resistance of Al-Si alloys was studied. In fact, Al-Si alloys are commonly used for the production of components, such as cylinders, pistons, pumps, valves and combustion chambers, which in service may incur in cavitation phenomenon. Samples of AlSi3, AlSi9 and AlSi9CuFe were characterized from the microstructural point of view. Hardness measurements were also performed. Subsequently, cavitation tests were carried out according to ASTM G32 standard and the erosion mechanism was examined by scanning electron microscope. It was found the both eutectic and intermetallic phases enhance cavitation resistance, expressed in terms of mass loss. Particularly, intermetallic particles with complex morphologies provide a positive contribution, exceeding that of other microstructural features, as grain size. The effect of T6 heat treatment was also evaluated. It was confirmed that the precipitation of fine strengthening particles in the Al matrix successfully hinders the movement of dislocations, resulting in a longer incubation stage and a lower mass loss for heat-treated samples in comparison with as-cast ones. Finally, the relationship between cavitation resistance and material hardness was investigated.Citation: Tocci, M., Pola, A., Montesano, L., La Vecchia, G. M., Evaluation of cavitation erosion resistance of Al-Si casting alloys: effect of eutectic and intermetallic phases, Frattura ed Integrità Strutturale, 43 (2018) 218-230.

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“…Cast aluminum-silicon alloys are weak in resisting cavitation erosion [7][8][9]. Cavitation erosion is a common damage phenomenon of cast aluminum alloys.…”

Section: Introductionmentioning

confidence: 99%

Microstructural properties and cavitation behavior of hypereutectic Al-Si alloy obtained by rheocasting process

Ćosić¹,

Dojčinović²,

Aćimovic-Pavlović³

2014

Zas Mat

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Microstructural properties and cavitation behavior of hypereutectic Al-Si alloy obtained by rheocasting processThe purpose of this study was to investigate possible application of AlSi alloy produced by rheocasting process in cavitation conditions. A rheocasting process was used to refine the as cast microstructure and improve the mechanical properties of Al18wt%Si alloy. Mechanical stirring was applied to the melt for different stirring time: 60,120,180s at different temperatures below the liquidus temperature of the alloy, using different stirring speed values, before pouring into a metallic mould. The microstructure of the cast samples was characterized by optical and scanning electron microscopy. The paper investigates the effect of stirring speed and stirring time on the microstructure of AlSi alloy obtained by rheocasting procedure. The microstructure morphology and the alloy mechanical properties were found to depend on the stirring time and the stirring speed, and by using a suitable combination of these parameters it is possible to achieve high refinement efficiency by treating the melts in the semisolid state. Cavitation resistance of these samples has been tested. Mass loss of specimens was measured by an analytical method. The morphology of damaged surfaces of tested samples was examined using scanning electron microscopy (SEM). According to the results, it can be concluded that the samples of AlSi piston alloy prepared via rheocasting process, can be successfully applied in conditions where the cavitation resistance is needed.

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Cavitation erosion of aluminium alloys

Cited by 34 publications

References 9 publications

Controlled ultrasound tissue erosion: The role of dynamic interaction between insonation and microbubble activity

Controlled ultrasound tissue erosion: The role of dynamic interaction between insonation and microbubble activity

Evaluation of cavitation erosion resistance of Al-Si casting alloys: effect of eutectic and intermetallic phases

Microstructural properties and cavitation behavior of hypereutectic Al-Si alloy obtained by rheocasting process

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