Thermal Analysis of the Solidification Behavior of AA7075 Containing Nanoparticles

Sokoluk, Maximilian; Rosa, Igor M. De; Pan, Shuaihang; Li, Xiaochun

doi:10.1007/978-3-030-65396-5_37

Cited by 3 publications

(4 citation statements)

References 15 publications

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“…Yuan, et al nano-treated a high-Zn 7XXX-series alloy and discovered that TiC improved secondary phase dissolution during heat treatment and allowed for faster aging in tandem with the increased Zn content [8]. Sokoluk, et al further used a two-thermocouple setup to study the thermal effects of nanoparticle addition in AA7075 and showed that nanoparticle restriction on the solidification fronts of Al grains evoked a slow heat release, preventing dendritic grain growth [9]. This analysis was also applied to AA2024 and AA6061, showing that the thermal effects of nanoparticles can be applied to any Al alloy to beneficially shift the terminal solid and liquid fractions and prevent hot cracking [10].…”

Section: Introductionmentioning

confidence: 99%

Natural aging of heterogeneous arc-welded AA6061-AA7075 joints with nanocomposite filler

Murali

Zheng

Chi

et al. 2023

Science and Technology of Welding and Joining

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We report the dissimilar joining of aluminium alloys 6061 and 7075 using filler rods nano-treated with TiC nanoparticles. TiC enables the formation of a fine and equiaxial weld metal microstructure while preventing the formation of hot cracks. Dissimilar joints were also naturally aged, and their strength evolutions were tracked over 8 weeks and compared to a nano-treated, homogeneous AA7075 joint. Heterogeneous weld metals regained over 30 HV with a mix of MgZn 2 and Mg 2 Si strengthening phases. Nano-treatment thus shows great promise, being able to facilitate the fusion welding of a traditionally difficult-to-weld system and enable a natural aging response between two artificially aged alloys.

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Section: Introductionmentioning

confidence: 99%

Natural aging of heterogeneous arc-welded AA6061-AA7075 joints with nanocomposite filler

Murali

Zheng

Chi

et al. 2023

Science and Technology of Welding and Joining

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“…In recent years, nanotreating, through the addition of a small volume fraction of nanoparticles in aluminum alloys, has shown success in reducing hot cracking susceptibility. Despite the lack of undercooling in the WAAM process, nanoparticles can control grain nucleation and growth during the solidification process (De Cicco et al , 2011; Choi et al , 2013; Martin et al , 2017; Sokoluk et al , 2019; Zuo et al , 2019; Yuan et al , 2020a, 2020b; Sokoluk et al , 2021). They modify the solidification behavior of aluminum alloys by controlling the latent heat release during alpha grain nucleation and ultimately lead to improved backfilling in the semi-solid network (Sokoluk et al , 2021).…”

Section: Introductionmentioning

confidence: 99%

“…Despite the lack of undercooling in the WAAM process, nanoparticles can control grain nucleation and growth during the solidification process (De Cicco et al , 2011; Choi et al , 2013; Martin et al , 2017; Sokoluk et al , 2019; Zuo et al , 2019; Yuan et al , 2020a, 2020b; Sokoluk et al , 2021). They modify the solidification behavior of aluminum alloys by controlling the latent heat release during alpha grain nucleation and ultimately lead to improved backfilling in the semi-solid network (Sokoluk et al , 2021). The presence of nanoparticles also fragments or refines the bulky second phases to prevent the blockage of eutectic liquid filling.…”

Section: Introductionmentioning

confidence: 99%

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Wire arc additive manufacturing (WAAM) of nanotreated aluminum alloy 6061

Chi

Murali

Liu

et al. 2022

RPJ

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Purpose Additive manufacturing (AM) can achieve significant weight savings with only minor compromises in strength if high-performance wrought aluminum alloys are used as feedstock. Despite the advantages in strength that aluminum alloys (AA) 6061 offer, they cannot be manufactured via printing because of hot cracking and other solidification problems. The purpose of this study is to achieve high-quality printing of AA6061 with nanotreated wires. Design/methodology/approach Nanotreating was used to modify the AA6061 alloy composition by adding a small fraction of nanoparticles to enhance the alloy’s manufacturability and resultant properties. Wire arc additive manufacturing (WAAM) was used to print the nanotreated AA6061 wire feedstock. The microstructure of the printed AA6061 was characterized by X-ray crystallography, optical microscopy, scanning electron microscopy and energy dispersive spectroscopy mapping. The microhardness profile, tensile behavior and fracture surface were analyzed. Findings This work successfully used WAAM to print nanotreated AA 6061 components. The resulting AA6061 parts were crack-free, with exceptional grain morphology and superior mechanical properties. Owing to the excellent size control capabilities of nanoparticles, a homogeneous distribution of small grains was maintained in all deposited layers, even during repeated thermal cycles. Originality/value Previous studies have not successfully printed AA6061 using WAAM. Conventional WAAM products exhibit anisotropic mechanical properties. The nanotreated AA6061 was successfully printed to achieve homogeneous microhardness and isotropic tensile properties. The promising results of this study reflect the great potential of nanotech metallurgy as applied to the WAAM process.

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Nanoparticle-Enhanced Arc Welding of Aluminum Alloys

Murali

2023

The Minerals, Metals &Amp; Materials Series

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Thermal Analysis of the Solidification Behavior of AA7075 Containing Nanoparticles

Cited by 3 publications

References 15 publications

Natural aging of heterogeneous arc-welded AA6061-AA7075 joints with nanocomposite filler

Natural aging of heterogeneous arc-welded AA6061-AA7075 joints with nanocomposite filler

Wire arc additive manufacturing (WAAM) of nanotreated aluminum alloy 6061

Nanoparticle-Enhanced Arc Welding of Aluminum Alloys

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