Laser metal deposition for additive manufacturing of AA5024 and nanoparticulate TiC modified AA5024 alloy composites prepared with balling milling process

Zhao, Tong; Dahmen, Marius; Cai, Wangcan; Alkhayat, Moritz; Schaible, Jonathan; Albus, Patrick; Chen, Zhong; Chen, Hong; Biermann, Tim; Zhang, Han; Gu, Dongdong; Weisheit, Andreas; Gasser, Andrés; Schleifenbaum, Johannes Henrich

doi:10.1016/j.optlastec.2020.106438

Cited by 44 publications

(23 citation statements)

References 64 publications

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“…31 The micro-hardness of this coating can be enhanced due to the anchoring/strengthening effect with the existence of NPs. 32 The lattice distortions were noted in the middle coating (see Figure 2D). The density of line defects and the free energy of grain boundary were increased under the actions of NPs, promoting formations of lattice distortions (Figure 2E).…”

Section: Resultsmentioning

confidence: 96%

“…24 A number of dispersed C were able to react with Ti/Si to form TiC/SiC, enhancing the micro-hardness of coating by dispersion strengthening, the grains were refined by dispersed Cu, reinforcing LC coating. 25,26 As shown in Figure 2A, NPs were observed in a middlecoating, such as Si/Ti nanoparticles, forming fine/compact microstructure due to the heterogeneous nucleation and the high interface energy of NPs. 27 A schematic diagram of Si 3 N 4 /Ti reaction principle is shown in Figure 2B.…”

Section: Resultsmentioning

confidence: 99%

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Microstructure performance enhancement of Si₃N₄ reinforced laser clad KF110 base composite coatings

Zhang

Sun

et al. 2021

Int J Applied Ceramic Tech

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The KF110-Si 3 N 4 -La 2 O 3 -Cu composite coatings were fabricated on TA2 by a laser cladding (LC). Microstructure, elemental distribution, high temperature oxidation, and wear resistance were investigated. Research results showed that the nanocrystalline phases (NPs) and the amorphous phases (APs) were formed due to the existence of the short atomic radius elements/fast cooling rate during an LC process; the uniform distributed NPs with the high interface energy were produced due to an addition of Cu, enhancing wear resistance of an LC coating. Lattice distortions were produced due to high temperature of a laserinduced pool (LIP). Addition of the alloy elements enhanced high temperature oxidation resistance of this coating. Excessive addition of Si 3 N 4 caused defects to be produced, enhancing the brittleness of this coating.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Microstructure performance enhancement of Si₃N₄ reinforced laser clad KF110 base composite coatings

Zhang

Sun

et al. 2021

Int J Applied Ceramic Tech

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“…This was mainly because laser melting involves highly concentrated energy input, leading to large local-temperature gradients during solidi cation. It is worth mentioning that there is a current interest in developing alternative Al-based alloys for the aforementioned processes, which is mostly focused on the modi cation of commercially available alloys [22,23].…”

Section: Introductionmentioning

confidence: 99%

Laser Remelting of AlSi10Mg(-Ni) Alloy Surfaces: Influence of Ni Content and Cooling Rate on the Microstructure

Moura¹,

Gouveia²,

Figueira³

et al. 2022

Preprint

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AlSi10Mg alloys are widely employed in a variety of industries, including aerospace, automotive, and microelectronics. This is because of its low density, acceptable mechanical properties, acceptable corrosion resistance, and inexpensive application cost. Advantageous fluidity, a short solidification period, and minimal volumetric contraction are beneficial characteristics under processing such alloys. Despite being used as commercial alloys, the mechanical properties of the AlSi10Mg alloys still need to be improved. In line with this, the current focus of Al-based alloys development is mostly on modifying commercially available alloys. Under such context, Ni was used as an alloying element in this study to generate the Al3Ni intermetallics, distinguished by its improved mechanical strength. Furthermore, the thermal stability of the Al3Ni may be a benefit, particularly for high-temperature applications. The present study aims to investigate the solidification under low and high cooling rates of four alloys: AlSi10Mg, AlSi10Mg-1Ni, AlSi10Mg-2Ni, and AlSi10Mg-3Ni (wt.%). Samples were obtained by directional solidification (DS) and laser surface remelting (LSR) processes. The cooling rates were calculated for the DS samples and with extrapolation for LSR samples as well as with the use of a model from the literature. After testing several laser conditions, the results also include an examination of microstructural and hardness changes in the treated and untreated zones. The produced gradient of microstructures is fully characterized as well as used to evaluate cooling rates inside the laser molten pools. For energy densities of 400 J/mm2 and 100 J/mm2, the mean dendritic spacings, λ, of the three Ni-containing alloys at the laser molten pool yelded estimated cooling rates of approximately 1.5 104 oC/s and 4.7 104 oC/s, respectively. A model explaining the reversion of λ across the molten pool will be outlined.

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“…The aluminum alloy AlSi10Mg was reinforced with 5 ma% TiC nanoparticles and manufactured with PBF-LB/M by Gu et al [ 27 ] resulting in a hardness increase of about 25%. A TiC-modified AA5024 containing scandium (Sc) and zirconium (Zr), well-known as effective grain refiners, was investigated for laser metal deposition and revealed no appreciable effects in increasing strength or hardness [ 28 ]. However, for AA7075 reinforced with 4 ma% TiB 2 µm-particles and processed by using laser metal deposition, an increase in hardness of more than 50% and a decrease of the grain size by 32% were observed [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

“…Dry mixing with [ 34 ] and without [ 34 , 35 ] the previous use of an ultrasonic vibrator, ball milling [ 15 , 28 , 30 ], satelliting technique [ 36 , 37 ], or fluidized bed system [ 38 ] are appropriate techniques, with advantages and disadvantages of each, to join particulate materials (chemical elements, ceramics) on the particle surface of the base powder material.…”

Section: Introductionmentioning

confidence: 99%

Requirements for Processing High-Strength AlZnMgCu Alloys with PBF-LB/M to Achieve Crack-Free and Dense Parts

et al. 2021

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Processing aluminum alloys employing powder bed fusion of metals (PBF-LB/M) is becoming more attractive for the industry, especially if lightweight applications are needed. Unfortunately, high-strength aluminum alloys such as AA7075 are prone to hot cracking during PBF-LB/M, as well as welding. Both a large solidification range promoted by the alloying elements zinc and copper and a high thermal gradient accompanied with the manufacturing process conditions lead to or favor hot cracking. In the present study, a simple method for modifying the powder surface with titanium carbide nanoparticles (NPs) as a nucleating agent is aimed. The effect on the microstructure with different amounts of the nucleating agent is shown. For the aluminum alloy 7075 with 2.5 ma% titanium carbide nanoparticles, manufactured via PBF-LB/M, crack-free samples with a refined microstructure having no discernible melt pool boundaries and columnar grains are observed. After using a two-step ageing heat treatment, ultimate tensile strengths up to 465 MPa and an 8.9% elongation at break are achieved. Furthermore, it is demonstrated that not all nanoparticles used remain in the melt pool during PBF-LB/M.

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Laser metal deposition for additive manufacturing of AA5024 and nanoparticulate TiC modified AA5024 alloy composites prepared with balling milling process

Cited by 44 publications

References 64 publications

Microstructure performance enhancement of Si₃N₄ reinforced laser clad KF110 base composite coatings

Microstructure performance enhancement of Si₃N₄ reinforced laser clad KF110 base composite coatings

Laser Remelting of AlSi10Mg(-Ni) Alloy Surfaces: Influence of Ni Content and Cooling Rate on the Microstructure

Requirements for Processing High-Strength AlZnMgCu Alloys with PBF-LB/M to Achieve Crack-Free and Dense Parts

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Laser metal deposition for additive manufacturing of AA5024 and nanoparticulate TiC modified AA5024 alloy composites prepared with balling milling process

Cited by 44 publications

References 64 publications

Microstructure performance enhancement of Si3N4 reinforced laser clad KF110 base composite coatings

Microstructure performance enhancement of Si3N4 reinforced laser clad KF110 base composite coatings

Laser Remelting of AlSi10Mg(-Ni) Alloy Surfaces: Influence of Ni Content and Cooling Rate on the Microstructure

Requirements for Processing High-Strength AlZnMgCu Alloys with PBF-LB/M to Achieve Crack-Free and Dense Parts

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Microstructure performance enhancement of Si₃N₄ reinforced laser clad KF110 base composite coatings

Microstructure performance enhancement of Si₃N₄ reinforced laser clad KF110 base composite coatings