A Comparison of the Use of Ultrasonic Melt Treatment and Mechanical Vibration in the Manufacture of Al5Si5Zn Alloy Feedstock for Thixoforming

Proni, Cecília Tereza Weishaupt; Brollo, Gabriela Lujan; Zoqui, Eugênio José

doi:10.1007/s11663-019-01741-7

Cited by 9 publications

(5 citation statements)

References 23 publications

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“…The common approaches to develop new alloys mostly relied on CALPHAD and targeted experiments [133][134][135][136], which can not develop a large number of suitable alloys rapidly. The Material Genomic technology such as materials' design softwares and high-throughput methods to experimentally validate the candidate alloys are needed to exploit this capability effectively.…”

Section: Discussionmentioning

confidence: 99%

Current Progress in Rheoforming of Wrought Aluminum Alloys: A Review

Gan

et al. 2020

Metals

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Semi-solid processing (SSP), including rheoforming and thixoforming, offers a promising opportunity to manufacture net-shaped parts with complex structure and excellent mechanical properties. Owing to its low cost and short process, rheoforming has been the subject of extensive study over the last two decades. The interest in the rheoforming of wrought aluminum alloys is progressively growing among both the research and industrial communities. This review starts with reviewing the recent efforts and advances on preparation of semi-solid slurry of wrought Al alloys, followed by discussing the correlation between microstructure and performance of these alloys. Finally, special attention is paid in the industrial application and the future trends of rheoforming of wrought aluminum alloys.

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Section: Discussionmentioning

confidence: 99%

Current Progress in Rheoforming of Wrought Aluminum Alloys: A Review

Gan

et al. 2020

Metals

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“…Based on the cavitation and acoustic flow effects of ultrasonication, ultrasonic treatment accelerates melt flow by the periodic growth and explosion of air bubbles, thus changing the pressure and temperature field of the melt [ 19 , 20 , 21 , 22 , 23 ]. In addition, ultrasonic treatment has many advantages; it is a simple process, it exhibits low cost and it has no significant impact on the melt composition [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ultrasonic-Assisted Modification Treatment on the Microstructure and Properties of A356 Alloy

Song

Wang

et al. 2022

Materials

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Ultrasonic treatment was applied to an A356 aluminum melt with different modifiers, and the effects of ultrasonic treatment on the structure and properties of the A356 alloy were studied. The results showed that α-Al was effectively refined with different ultrasonic modification treatments. In particular, ultrasonic treatment showed the most obvious refinement with macroscopic grains of unmodified alloy and optimized the refinement of secondary dendrite arm spacings in the Sr/Ce synergistic alloys. The eutectic Si of the unmodified A356 alloy had no obvious change after the ultrasonic treatment, but the branch diameter of the eutectic Si reduced in the Sr and Sr/Ce modification alloys after the ultrasonic treatment. The ultrasonic treatment significantly improved the ultimate tensile strength and elongation of the as-cast A356 alloy with the unmodified material, which was due to refinement of the α-Al grains by the ultrasonic treatment. After the T6 heat treatment, the ultimate tensile strength values of the alloys showed no obvious change due to the ultrasonic treatment, but the plasticity of the alloy was significantly improved. Mg2Si precipitation was the dominant strengthening mechanism during the T6 heat treatment, while the plasticity was determined by the size and distribution of the eutectic Si. Acoustic cavitation caused by the ultrasound-activated impurities and the induced heterogeneous nucleation and supercooled nucleation in the groove melt was the main cause of the α-Al refinement, the eutectic Si modification and the improvement in the mechanical properties.

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“…Note that, several alloys from the Al-Si-Mg, Al-Si-Zn and Al-Zn-Mg tertiary systems are successfully used as thixoforming feedstock as presented by ZOQUI [7]. However, the simultaneous combination of these elements (the quaternary Al-Si-Zn-Mg system) for SSM processing applications was barely studied and represents a potential range of feedstock that combines the advantages of the thixoforming process with the possibility of heat treatment after forming for improved mechanical performance as presented by PRONI et al [18], PRONI et al [19] and DANTAS et al [20]. Second phase particles found in precipitation hardenable Al-alloys are classified in three categories:…”

Section: Introductionmentioning

confidence: 99%

“…In this work, theAl-5.5wt%Si-5wt%Zn-0.2wt%Mg alloy is studied. Its thermodynamic stability, microstructural evolution during partial melting and rheological behavior under compression in the semisolid state were successfully evaluated in a previous studies by PRONI et al [18], PRONI et al [19] and DANTAS et al [20]. Here the mechanical performance (tensile test and hardness) of this alloy will be evaluated as a response to the distribution and combination of its alloying elements and how these features are affected by strain (thixoforming operation) and heat (SHT) imposed to the alloy.…”

Section: Introductionmentioning

confidence: 99%

The effect of the chemical distribution on the mechanical properties of the Al-5.5wt%Si-5wt%Zn-0.2wt%Mg alloy after thixoforging and solution heat treatment

2022

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The effect of heat and strain during the semisolid processing route on the microstructural evolution and mechanical performance of the Al-5.5wt%Si-5wt%Zn-0.2wt%Mg alloy was evaluated. The as cast alloy was heated and partially melted to 588 °C (fs = 0.40), thixoformed (in an open die forged) and solution heat-treated (SHT) at 525 °C for 1 to 6 h. The microstructural evolution and chemical distribution (SEM-EDS) of the main alloying elements were evaluated at each step of the processing route. The SHT for 2.5 h after thixoforming showed to be adequate considering (a) the spheroidization of Si crystals, (b) the formation of Fe-and Mn-rich platelet-like particles in the eutectic phase, (c) the Mg dissolution from the Mg2Si conglomerates and (d) the homogeneous Zn diffusion along the entire part. As a consequence of the higher circularity of secondary particles, the possibility of crack formation and propagation under stress was minimized. The possible formation of solute clusters and GP zones containing Zn, Mg, Si and Cu was enabled due to the dissolution and diffusion of secondary elements during SHT, which increased the alloy's mechanical strength. Larger Si crystals and the homogeneous spatial spread of Zn resulted in the hardness increase of the SHT alloy.

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A Comparison of the Use of Ultrasonic Melt Treatment and Mechanical Vibration in the Manufacture of Al5Si5Zn Alloy Feedstock for Thixoforming

Cited by 9 publications

References 23 publications

Current Progress in Rheoforming of Wrought Aluminum Alloys: A Review

Current Progress in Rheoforming of Wrought Aluminum Alloys: A Review

Effect of Ultrasonic-Assisted Modification Treatment on the Microstructure and Properties of A356 Alloy

The effect of the chemical distribution on the mechanical properties of the Al-5.5wt%Si-5wt%Zn-0.2wt%Mg alloy after thixoforging and solution heat treatment

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