Ultrasonic grain refinement of die cast copper alloys

Puga, Hélder; Barbosa, J.; Machado, Joana; Vilarinho, Cândida

doi:10.1016/j.jmatprotec.2018.08.034

Cited by 19 publications

(8 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With the application of UST, prominent changes were observed in the grain morphology of the matrix. The microstructure of the composites depends mainly on heterogeneous nucleation and fragmentation of coarse grains [19,23]. At 1500 W UST power, the morphology of coarse semi-continuous net phases does not change because of the smaller level of UST.…”

Section: Composite Microstructurementioning

confidence: 99%

See 1 more Smart Citation

Influence of ultrasonication power on grain refinement, mechanical properties and wear behaviour of AZ91D/nano-Al₂O₃ composites

Gnanavelbabu

Surendran

Kumar

2020

Mater. Res. Express

View full text Add to dashboard Cite

In this study, magnesium alloy (AZ91D) matrix composites reinforced with 1 wt% of nano alumina (n-Al 2 O 3 ) were fabricated using novel Ultrasonic Treatment (UST)assisted squeeze casting method. UST was carried out at four different levels of ultrasonic power namely, 0 W (without UST), 1500 W, 2000 W and 2500 W at constant frequency and time. The composites were heat-treated at T6 condition under argon gas protected environment. Microstructural analysis was done using optical microscopy and high-resolution scanning electron microscopy. Physical, mechanical and tribological properties of the composites were evaluated. A significant refinement in grain structure and improvement in porosity was seen on an increase in UST power. Improvement was seen in microhardness, yield strength, ultimate tensile strength and % of elongation of the composite fabricated at 2500 W by 18%, 48%, 28%, and 10% respectively compared to an untreated composite. The composite fabricated at 2500 W showed less wear rate and coefficient of friction when compared to other composites at all sliding conditions. Scanning electron microscope images of the worn surface of the composite pins revealed that the wear mechanisms dominated were abrasion, adhesion, oxidation and delamination.

show abstract

Section: Composite Microstructurementioning

confidence: 99%

“…A refined and uniform grain structure is most important for obtaining good mechanical and tribological properties of composites [18][19][20]. Recently, many advanced material processing techniques are employed for modifying the microstructure of the magnesium-based composites [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Influence of ultrasonication power on grain refinement, mechanical properties and wear behaviour of AZ91D/nano-Al₂O₃ composites

Gnanavelbabu

Surendran

Kumar

2020

Mater. Res. Express

View full text Add to dashboard Cite

show abstract

“…Puga et al [19] proved that the ultrasonic cavitation technique is more favorable than the chemical refiner, Cu-B refiner, to produce Cu-Zn alloys with enhanced mechanical properties due to the formed spherical structures instead of the original large needle block-like of the non-treated Cu-Zn alloys. Inducing the acoustic streaming into the melted soldered aluminum [20] and SAC0307 lead-free solder [21] joints efficiently refine their structures and enhance their mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and corrosion characteristics of grain refined ZA-27 alloy and ZA-27/Al2O3 nano-composite produced by ultrasonic cavitation technique

Hayajneh¹,

Almomani²,

Al-Akailah³

2021

View full text Add to dashboard Cite

In this study, the physical, mechanical, and chemical characteristics of grain refined zinc--aluminum alloy (ZA-27) and ZA-27 based nano-composite reinforced with 1wt.%Al2O3 nanoparticles have been investigated. Ultrasonic cavitation technique was used to fabricate these materials, and they were examined using optical microscopy, micro-Vickers hardness tester, and potentiodynamic polarization. Scanning electron microscopy (SEM) equipped with energy-dispersive X-ray spectroscopy (EDX) was used to investigate surface morphology and chemical elements of the specimens before and after corrosion testing to explain corrosion behaviors. ZA-27 alloy with fine equiaxed grains and 22 % porosity content with respect to the as-cast alloy was fabricated, resulting in a higher microhardness number. Potentiodynamic polarization test results revealed that it has better resistance for localized corrosion; the rapid dissolution of the zinc-rich phase presented in the interspacing region produces a salt layer quickly; this layer effectively protects the underlying metal surface from pits formation. The fabricated nano-composite has a porosity content of 54.2 % of the as-cast porosity content, and a smaller dendritic structure was formed with a uniform dispersion of the Al2O3 nanoparticles within the ZA-27 alloy matrix. Therefore, its microhardness number is greater than that of the as-cast alloy. The potentiodynamic polarization test analyses revealed that its uniform and localized corrosion resistance was improved. Micro-galvanic cells were formed between the primary and secondary phases in the small dendritic structure of the nano-composite, which improves its corrosion resistance.

show abstract

“…With the increase in ultrasonic power, the effects will be significantly enhanced [20]. Due to these effects, the homogeneity of solute elements and fluidity of the melt can be enhanced, as well as improving the grain refinement and melt degassing efficiency [21][22][23][24]. At present, most researchers use a method of directly introducing ultrasonic waves in the upper part of the melt to treat the metal melt.…”

Section: Introductionmentioning

confidence: 99%

Effects of Ultrasonic Bending Vibration Introduced by an L-Shaped Ultrasonic Rod on the Microstructure and Properties of a 1060 Aluminum Alloy Strip Formed by Twin-Roll Casting

et al. 2020

View full text Add to dashboard Cite

In order to achieve the industrial application of ultrasonic energy in the continuous casting and rolling production of aluminum alloy, a new type of L-shaped ultrasonic rod was used to introduce an ultrasonic bending vibration into the aluminum melt in the launder during the horizontal twin-roll continuous casting and rolling process of a 1060 aluminum alloy. The effects of the ultrasonic bending vibration on the microstructure and properties of the 1060 aluminum alloy cast rolling strip and its subsequent cold rolling strip were studied experimentally, and the effect of the ultrasonic-assisted refining with different amounts of Al-Ti-B refiner was explored. The results show that under the same addition amount of Al-Ti-B refiner, the ultrasonic bending vibration can refine the grains of the cast rolling strip, make the distribution of precipitates more uniform, reduce the slag inclusion defects, and improve the mechanical properties to a certain extent. The microstructure and properties of the ultrasonic cast rolling strip with 0.18 wt% Al-Ti-B refiner or 0.12 wt% Al-Ti-B refiner are better than those of the conventional cast rolling strip, but the microstructure and properties of the ultrasonic cast rolling strip with 0.09 wt% Al-Ti-B refiner are slightly worse than those of the conventional cast rolling strip. Moreover, after cold rolling, the effect of the ultrasonic bending vibration on the improvement of the microstructure and properties of the aluminum alloy strip is inherited. A comprehensive analysis shows that the use of ultrasonic energy in this paper cannot completely replace the effect of the Al-Ti-B refiner, but it can reduce the addition amount of the Al-Ti-B refiner by 1/3.

show abstract

Ultrasonic grain refinement of die cast copper alloys

Cited by 19 publications

References 7 publications

Influence of ultrasonication power on grain refinement, mechanical properties and wear behaviour of AZ91D/nano-Al₂O₃ composites

Influence of ultrasonication power on grain refinement, mechanical properties and wear behaviour of AZ91D/nano-Al₂O₃ composites

Mechanical and corrosion characteristics of grain refined ZA-27 alloy and ZA-27/Al2O3 nano-composite produced by ultrasonic cavitation technique

Effects of Ultrasonic Bending Vibration Introduced by an L-Shaped Ultrasonic Rod on the Microstructure and Properties of a 1060 Aluminum Alloy Strip Formed by Twin-Roll Casting

Contact Info

Product

Resources

About

Ultrasonic grain refinement of die cast copper alloys

Cited by 19 publications

References 7 publications

Influence of ultrasonication power on grain refinement, mechanical properties and wear behaviour of AZ91D/nano-Al2O3 composites

Influence of ultrasonication power on grain refinement, mechanical properties and wear behaviour of AZ91D/nano-Al2O3 composites

Mechanical and corrosion characteristics of grain refined ZA-27 alloy and ZA-27/Al2O3 nano-composite produced by ultrasonic cavitation technique

Effects of Ultrasonic Bending Vibration Introduced by an L-Shaped Ultrasonic Rod on the Microstructure and Properties of a 1060 Aluminum Alloy Strip Formed by Twin-Roll Casting

Contact Info

Product

Resources

About

Influence of ultrasonication power on grain refinement, mechanical properties and wear behaviour of AZ91D/nano-Al₂O₃ composites

Influence of ultrasonication power on grain refinement, mechanical properties and wear behaviour of AZ91D/nano-Al₂O₃ composites