Ceramic particle-induced accelerated solution-aging behavior of spray-formed 7055 aluminum alloy TIG weld metal

Cheng, Yuxuan; Yuan, Wei-xia; Xu, Junhua; Yu, Lihua; Hu, Yu; Huang, Ting; Zhang, Hao

doi:10.1007/s10853-022-08117-4

Cited by 6 publications

(4 citation statements)

References 53 publications

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“…This indicates a good thermal stability of the grains, that remain small even after solution treatment at 480°C and artificial aging at 120°C. These results are in accord with recent studies [14,40] which showed that TiC nanoparticles prevent grain growth during heating due to the pinning effect they have on grain boundaries. Figure 6 indicates that heat treatment causes the percentage of high angle grain boundaries to increase, as it changed from 67% in the as-built condition, to 94% in the heat-treated sample.…”

Section: Resultssupporting

confidence: 93%

“…A possible explanation for the early precipitation of S' might be that the presence of TiC nanoparticles has accelerated the aging kinetics. Other studies have shown that nanoparticles can act as heterogeneous nucleation sites, interact preferentially with quenched-in vacancies, and create dislocations that facilitate diffusion of alloying elements, thus inducing a faster aging behaviour [40][41][42]. The morphology of the eutectic phase in Figure 3 suggests that the sample displays an equiaxed grain structure.…”

Section: Resultsmentioning

confidence: 87%

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Coaxial Wire Laser-based Additive Manufacturing of AA7075 with TiC Nanoparticles

Meneses,

Tuominen,

Ylä-Autio

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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AA7075 is a heat treatable aluminium alloy widely used in aerospace and automotive applications due to its outstanding high strength-to-weight ratio. However, the implementation of this alloy in Additive Manufacturing (AM) processes has been limited due to its susceptibility to hot cracking. Moreover, selective evaporation of low boiling point elements Zn and Mg can cause gas porosity and diminish the mechanical properties of AM parts. Recent research revealed the effectiveness of nanoparticles additives to change the solidification behaviour of high-strength aluminium alloys and improve their weldability/printability. In this study, AA7075 enhanced with TiC nanoparticles was utilized as wire feedstock to create single and multi-layer samples with coaxial laser-directed energy deposition (L-DED). The response of the samples to precipitation hardening was studied, evaluating the microstructure and the microhardness before and after T6 heat treatment. Specimens were characterized using optical and electron microscopy and electron backscatter diffraction (EBSD). Crack-free and virtually porosity-free samples were fabricated, which exhibit a refined equiaxed grain structure with grain size <10μm. This confirms the ability of TiC nanoparticles to prevent columnar dendritic growth and promote heterogeneous nucleation. Microhardness values increased by 51 HV after T6 heat treatment and were uniform across the sample. Energy Dispersive Spectroscopy (EDS) analysis showed that there are evaporation losses of Zn and Mg. Considering the boiling temperatures of these elements, it is inferred that the molten pool reaches temperatures above 1090°C, and the partially melted zone temperature is between 907°C and 1090°C.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 87%

Coaxial Wire Laser-based Additive Manufacturing of AA7075 with TiC Nanoparticles

Meneses,

Tuominen,

Ylä-Autio

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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show abstract

“…The particles embedded in the matrix act as reinforcements [72][73][74], and they intercept the dislocation motions through interactions with the dislocations [121]. These reinforcements and interactions contribute to enhancing the mechanical properties, including hardness, which highlights the advantages of combinations and multi-phases [94]. In Figure 16, a vivid schematic illustration is presented, showing that with the increase of Si atoms embedded in the NbNx matrix, a SiNx layer forms at the SiNx:Si grain boundaries.…”

Section: The Precipitations Forming During Depositionmentioning

confidence: 99%

“…In this section, our focus will be on summarizing the target materials that have an impact on the properties and service performance of the films. Subramanian et al [92][93][94] have provided a comprehensive summary of multi-component and multilayer coatings, revealing the inter-relationship between various fundamental parameters within a coating system, as depicted in Figure 8.…”

Section: The Chemical Constitutionsmentioning

confidence: 99%

Insight into the Mechanisms of Nitride Films with Excellent Hardness and Lubricating Performance: A Review

Wu,

Jiang,

et al. 2023

Nanomaterials

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Transition metal nitride (TMN) films with excellent hardness and lubricating performance are versatile low dimension materials, which are widely used in various fields including industries, transportation, aerospace, and so on. This paper introduces one film design strategy and provides a review of the mechanisms for strengthening and lubricating nitride films. The design strategy refers to two aspects which determine the structures, the performance, the components, and the chemical constitutions of nitride films The strengthening mechanisms of nitride films are then illuminated in detail, including the solid solution effect, the grain size effect, the secondary phase effect, the stress or stress field effect, the template effect, and the valence electron concentration effect. Five lubricating mechanisms are next summarized, including the easy-shear nature, the tribo-chemical reactions, the lubricious fluorides, the textured contact surface, and the synergistic effect. This paper aims to give a comprehensive introduction for understanding the mechanisms of strengthening and lubrication of nitride films for students and researchers, as well as to understand the current research progress in nitride films for exploring research gaps.

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Effects of Pre‐Placed Nano‐TiC Powder on the Performance of Steel/Aluminum Laser Welded Joints

Zhu,

Guo,

Zhang

et al. 2024

steel research int.

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The steel/aluminum dissimilar metal welding plays a significant role in lightweighting automotive structures. However, the formation of hard and brittle intermetallic compounds (IMCs) in steel/aluminum welded joints severely compromises their mechanical performance. Nano ceramic particles such as TiC possess characteristics that inhibit the diffusion of Fe and Al, thereby exhibiting a significant advantage in suppressing IMCs formation in steel/aluminum welded joints. In this study, an optimized laser‐welding process is employed to investigate the mechanical properties of steel/aluminum dissimilar metal joints with different concentrations of TiC nanoparticles. It is aimed to determine the optimal TiC addition concentration by comparing the mechanical performance. Additionally, the inhibitory effect of TiC particles on the formation and growth of brittle Fe–Al IMCs is explored through an analysis of IMCs growth kinetics. In the research results, it is shown that the optimal TiC addition concentration is 1%. At this concentration, the tensile strength of the steel/aluminum welded joint reaches 98.29 MPa, showing a remarkable improvement of 32.65% compared to the sample without TiC addition. The addition of TiC particles suppresses the mutual diffusion between Fe and Al, reduces the generation of brittle IMCs, and enhances the mechanical performance of the steel/aluminum joint.

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Ceramic particle-induced accelerated solution-aging behavior of spray-formed 7055 aluminum alloy TIG weld metal

Cited by 6 publications

References 53 publications

Coaxial Wire Laser-based Additive Manufacturing of AA7075 with TiC Nanoparticles

Coaxial Wire Laser-based Additive Manufacturing of AA7075 with TiC Nanoparticles

Insight into the Mechanisms of Nitride Films with Excellent Hardness and Lubricating Performance: A Review

Effects of Pre‐Placed Nano‐TiC Powder on the Performance of Steel/Aluminum Laser Welded Joints

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