Ultrasound Wave Attenuation of Grain Refined High – Zinc Aluminium Sand-cast Alloys

Krajewski, W.; Buraś, J.; Krajewski, Paweł; Piwowarski, G.

doi:10.1515/afe-2015-0037

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…As we can see in the pictures (Figs. [6][7][8], the finest microstructure is in the sample of the metal mold (Fig. 6).…”

Section: Discussionmentioning

confidence: 99%

“…It can be changed, however, in the process of alloy modification, a process which usually affects the volume and number of precipitation of a specific compound or the size of grain. The inoculant's impact on the alloy structure is reflected in the change of the damping coefficient value of a specific alloy [5][6][7]. The cooling rate, apart from modification process, can also affect the macro and microstructure of the alloy by the changing shape and grain size of the phases [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Influence of the Cooling Rate on Damping Characteristics of the ZnAl4Cu1 Alloy

Piwowarski

Gracz

2022

JCME

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The paper presents the results of damping coefficient tests in the ZnAl4Cu1 alloy (ZL5). The damping coefficient has been calculated on the basis of specimen measurements obtained with the use of the signal echo method. The method consists in passing the ultrasonic wave through the tested material. The ultrasonic wave from a transmitting and receiving head passes through a specimen, bounces off its bottom surface and comes back to the measuring head in the form of a signal echo. Difference in the signal strength between the first and the second echo in relation to the distance travelled by the ultrasound wave is a measure of the material’s damping characteristics. The specimens were cast into three molds made of different materials, i.e. green sand, plaster and metal. Thermophysical properties of these materials are different what affecting the rate of heat absorption from the cast. Three series of specimens have been obtained which cooled at different rates. The specimens were then subjected to ultrasound and microscopic tests to assess the alloy structure. The internal alloy structure affects its damping properties to a great extent.

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“…As we can see in the pictures (Figs. [6][7][8], the finest microstructure is in the sample of the metal mold (Fig. 6).…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of the Cooling Rate on Damping Characteristics of the ZnAl4Cu1 Alloy

Piwowarski

Gracz

2022

JCME

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“…These alloys have peritectic reactions that aid the heterogeneous nucleation which results in finer dendritic structure. Krajewski [12] added different ratios of Ti and found that damping coefficients were remained almost unchanged after 25 ppm Ti. Li [13] added Sc and Zr as grain refiner and modifier and found that 0.5wt% Sc was enough to grain refine 10 times.…”

Section: Introductionmentioning

confidence: 99%

Archives of Foundry Engineering

Gursoy,

Erzi,

Tur

et al. 2020

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Recyclability is one of the great features of aluminium and its alloys. However, it has been typically considered that the secondary aluminium quality is low and bad. This is only because aluminium is so sensitive to turbulence. Uncontrolled transfer and handling of the liquid aluminium results in formation of double oxide defects known as bifilms. Bifilms are detrimental defects. They form porosity and deteriorate the properties. The detection and quantification of bifilms in liquid aluminium can be carried out by bifilm index measured in millimetres as an indication of melt cleanliness using Reduced Pressure Test (RPT). In this work, recycling efficiency and quality change of A356 alloy with various Ti additions have been investigated. The charge was recycled three times and change in bifilm index and bifilm number was evaluated. It was found that when high amount of Ti grain refiner was added, the melt quality was increased due to sedimentation of bifilms with Ti. When low amount of Ti is added, the melt quality was degraded.

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“…One of the common additions in these alloys is copper, which builds so called bearing phases with zinc in sliding-bearing parts. It increases strength but also leads to the formation of the metastable ε CuZn 4 phase, which undergoes a very slow transformation to the stable T' phase Al 5 Cu 4 Zn, accompanied by significant dimensional changes [1][2][3]. For this reason Cu content should be reduced to about 3 wt.…”

Section: Introductionmentioning

confidence: 99%

Structural Stability of Novel Multicomponent AlZn-Based Cast Alloy

Krajewski¹,

Greer

Faryna

et al. 2018

MSF

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Structural modification of ternary aluminium – zinc – coper alloys influences their wear properties. In a series of studies, Al – 30 wt. % Zn – 3 wt. % Cu alloy (Al-30Zn-3Cu) has been doped with 1 wt.% Mn introduced with AlMn-based master alloys. The alloy microstructure and mechanical properties have been studied using light and SEM/EBSD microscopy, and measurements of wear resistance and dimensional changes. Reducing Cu content to 3 wt.% and doping with 1 wt.% Mn allows obtaining alloy of significantly refined grains, improved wear resistance and preserved high dimensional stability.

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Ultrasound Wave Attenuation of Grain Refined High – Zinc Aluminium Sand-cast Alloys

Cited by 4 publications

References 3 publications

Influence of the Cooling Rate on Damping Characteristics of the ZnAl4Cu1 Alloy

Influence of the Cooling Rate on Damping Characteristics of the ZnAl4Cu1 Alloy

Archives of Foundry Engineering

Structural Stability of Novel Multicomponent AlZn-Based Cast Alloy

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