Non-equilibrium solute partitioning in a laser re-melted Al–Li–Cu alloy

Heard, D.W.; Gauvin, Raynald; Brochu, Mathieu

doi:10.1016/j.actamat.2013.08.050

Cited by 24 publications

(8 citation statements)

References 29 publications

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“…Such cellular→planar transition is also indicated in the electrospark deposition of a ternary Al-Li-Cu alloy [80,81]. An ultrafine nano-cellular structure was observed at a high SFV of 1~2 m/s with a cell spacing of ~ 40 nm.…”

Section: 1microstructure Evolution During Lpbfmentioning

confidence: 59%

Additive Manufacturing Enabled Synergetic Strengthening of Bimodal Reinforcing Particles for Aluminum Matrix Composites

Shang

et al. 2022

SSRN Journal

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Section: 1microstructure Evolution During Lpbfmentioning

confidence: 59%

Additive Manufacturing Enabled Synergetic Strengthening of Bimodal Reinforcing Particles for Aluminum Matrix Composites

Shang

et al. 2022

SSRN Journal

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“…Non-equilibrium partitioning at high solidi cation rates was observed in the previous experimental study of the laser-melted alloys [7,[19][20][21]. The high solidi cation front velocity increases the solute trapping and therefore decreases the microsegregation.…”

Section: Introductionmentioning

confidence: 74%

Microstructure and Microsegregation Characterization of Laser Surfaced Remelted Al-3wt%Cu Alloys

Yao

Ren

Allison

2021

Preprint

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Solidification rates during laser remelting of solid metals occur under solidification conditions that are far from equilibrium conditions. The microstructural evolution and microsegregation behaviors are affected by these conditions. This study comprised an experimental characterization of the ultra-fine microstructure and microsegregation in laser surface remelted regions of a hypoeutectic Al-Cu alloy. The laser scan speed, which controls the cooling rate within the remelted region, was observed to have a significant effect on microstructural features and microsegregation. Dendrite arm spacing was determined to decrease with increasing scan speed and depended on location within the melt pool. A transition of the dendrite morphology was also observed in the melt pools. This transition, which is attributed to the grain orientation change influenced by the laser beam movement, was experimentally characterized. The measured microsegregation profiles show decreasing microsegregation as cooling rate increases which is typically of increasing undercooling and non-equilibrium solidification.

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“…The crystal growth in the solidification process was further analyzed using a modification model, which is a combination of Kurz-Giovanola-Trivedi (KGT) [ 35 ] and Lipton-Kurz-Trivedi (LKT) models [ 36 ]. As laser cladding is analogous to directional solidification, the effective partition coefficient during solidification can be calculated using the following equation [ 37 ]:

where V is solidification front velocity (hereinafter referred to as SFV); k ei is the equilibrium partition coefficient of component i ; a 0 is the characteristic length of the order of an atomic distance.…”

Section: Resultsmentioning

confidence: 99%

Microstructures Evolution and Micromechanics Features of Ni-Cr-Si Coatings Deposited on Copper by Laser Cladding

Zhang

2018

Materials

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Three Ni-Cr-Si coatings were synthesized on the surface of copper by laser cladding. The microstructures of the coatings were characterized by optical microscopy (OM), X-ray diffraction (XRD), and scanning electron microscopy (SEM) with an energy dispersive spectrometer (EDS). According to the analysis results of phase compositions, Gibbs free energy change and microstructures, the phases of three coatings appeared were Cr3Si+γ-Ni+Cuss (Coating 1, Ni-26Cr-29Si), Cr6Ni16Si7+Ni2Si+Cuss (Coating 2, Ni-10Cr-30Si) and Cr3Ni5Si2+Cr2Ni3+Cuss (Coating 3, Ni-29Cr-16Si). The crystal growth in the solidification process was analyzed with a modified model, which is a combination of Kurz-Giovanola-Trivedi (KGT) and Lipton-Kurz-Trivedi (LKT) models. The dendrite tip undercooling in Coating 2 was higher than those of Coating 1 and Coating 3. Well-developed dendrites were found in Coating 2. A modification of Hunt’s model was adopted to describe the morphological differences in the three coatings. The results show that Coating 1 was in the equiaxed dendrite region, while Coatings 2 and 3 were in the columnar dendrite region. The average friction coefficients of the three coatings were 0.45, 0.5 and 0.4, respectively. Obvious plastic deformation could be found in the subsurface zone of Coatings 2 and 3.

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Non-equilibrium solute partitioning in a laser re-melted Al–Li–Cu alloy

Cited by 24 publications

References 29 publications

Additive Manufacturing Enabled Synergetic Strengthening of Bimodal Reinforcing Particles for Aluminum Matrix Composites

Additive Manufacturing Enabled Synergetic Strengthening of Bimodal Reinforcing Particles for Aluminum Matrix Composites

Microstructure and Microsegregation Characterization of Laser Surfaced Remelted Al-3wt%Cu Alloys

Microstructures Evolution and Micromechanics Features of Ni-Cr-Si Coatings Deposited on Copper by Laser Cladding

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