Microstructure evolution in laser surface remelting of Ni–33wt.%Sn alloy

Wang, Zhitai; Lin, Xin; Cao, Yongqing; Huang, Weidong

doi:10.1016/j.jallcom.2013.05.119

Cited by 15 publications

(10 citation statements)

References 17 publications

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“…Anomalous eutectic growth of the Ni-Sn alloy has been observed in hypoeutectic [ 21 ], eutectic [ 14 ], and hypereutectic compositions [ 22 ]. One of the anomalous eutectic characterizations is the discontinuous α -Ni and continuous β -Ni 3 Sn, which means the morphologies of discontinuous α -Ni plays an important role in the formation of the anomalous eutectic.…”

Section: Introductionmentioning

confidence: 99%

Cellular Automaton Simulation of the Growth of Anomalous Eutectic during Laser Remelting Process

et al. 2018

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Anomalous eutectic morphologies were observed during laser remelting of a Ni-Sn powder bed, where it was sandwiched between a lamellar eutectic at the bottom of melt pool. That is, the anomalous eutectic growth mechanism can be divided into two processes: one is the lamellar to anomalous transition (LAT); the other is the anomalous to lamellar transition (ALT). The thermal distribution at the bottom of melt pool is simulated by the finite difference method. It is found that the cooling rate at the bottom of melt pool is a linear function of time. A cellular automaton (CA) model is developed to simulate the anomalous growth. Simulation results show that the mechanism of the LAT is that one phase overgrows the other followed by subsequent nucleating of the other phase. The mechanism of the ALT is the competitive growth between the anomalous and lamellar eutectic; as the cooling rate increased, the lamellar eutectic is more competitive.

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Section: Introductionmentioning

confidence: 99%

Cellular Automaton Simulation of the Growth of Anomalous Eutectic during Laser Remelting Process

et al. 2018

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“…Nevertheless, Wang et al [20] found that the microstructure in the remelted region was completely composed of a regular lamellar eutectic in laser surface remelting of Ni-33 wt.% Sn alloy when the laser scanning velocity was 20 mm s −1 . But when the laser scanning velocity decreased to 0.1 mm s −1 , α -Ni + Ni 3 Sn anomalous eutectic was found at the bottom of the remelted specimen.…”

Section: Resultsmentioning

confidence: 99%

“…All specimens were polished and cleaned thoroughly by acetone to ensure a similar surface condition before laser surface remelting. The laser remelting experiment was carried out using a continuous wave CO 2 laser with a nominal power of 2200 W [20]. The diameter of the laser beam was set to be 2 mm and the scanning speed was 0.1 mm s −1 .…”

Section: Methodsmentioning

confidence: 99%

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Three-dimensional reconstruction of anomalous eutectic in laser remelted Ni-30 wt.% Sn alloy

Cao

Lin

Wang

et al. 2015

Science and Technology of Advanced Materials

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Laser remelting has been performed on Ni-30 wt.% Sn hypoeutectic alloy. An anomalous eutectic formed at the bottom of the molten pool when the sample was remelted thoroughly. 3D morphologies of the α-Ni and Ni3Sn phases in the anomalous eutectic region were obtained and investigated using serial sectioning reconstruction technology. It is found that the Ni3Sn phase has a continuous interconnected network structure and the α-Ni phase is distributed as separate particles in the anomalous eutectic, which is consistent with the electron backscatter diffraction pattern examinations. The α-Ni particles in the anomalous eutectic are supersaturated with Sn element as compared with the equilibrium phase diagram. Meanwhile, small wavy lamella eutectics coexist with anomalous eutectics. The Trivedi–Magnin–Kurz model was used to estimate undercooling with lamellar spacing. The results suggest that the critical undercooling found in undercooling solidification is not a sufficient condition for anomalous eutectic formation. Besides, α-Ni particles in the anomalous eutectic do not exhibit a completely random misorientation and some neighboring α-Ni particles have the same orientation. It is shown that both the coupled and decoupled growth of the eutectic two phases can generate the α-Ni + Ni3Sn anomalous eutectic structure.

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“…A limitation for all the as-cast metal-intermetallic eutectic systems has been the lack of plastic deformability [2,3], often even under compression loading. Recent work on a chill cast or laser surface-remelted eutectics has shown that high strength at room temperature can be achieved without loss of plastic deformability in a wide range of refined eutectic microstructures in Al-, Ti-, Ni-, Zn-, and Fe-based alloys [4][5][6][7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior of Al–Al2Cu–Si and Al–Al2Cu Eutectic Alloys

2021

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In this study, laser rapid solidification technique was used to refine the microstructure of ternary Al–Cu–Si and binary Al–Cu eutectic alloys to nanoscales. Micropillar compression testing was performed to measure the stress–strain response of the samples with characteristic microstructure in the melt pool regions. The laser-remelted Al–Al2Cu–Si ternary alloy was observed to reach the compressive strength of 1.59 GPa before failure at a strain of 28.5%, which is significantly better than the as-cast alloy with a maximum strength of 0.48 GPa at a failure strain of 4.8%. The laser-remelted Al–Cu binary alloy was observed to reach the compressive strength of 2.07 GPa before failure at a strain of 26.5%, which is significantly better than the as-cast alloy with maximum strength of 0.74 GPa at a failure strain of 3.3%. The enhanced compressive strength and improved compressive plasticity were interpreted in terms of microstructural refinement and hierarchical eutectic morphology.

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Microstructure evolution in laser surface remelting of Ni–33wt.%Sn alloy

Cited by 15 publications

References 17 publications

Cellular Automaton Simulation of the Growth of Anomalous Eutectic during Laser Remelting Process

Cellular Automaton Simulation of the Growth of Anomalous Eutectic during Laser Remelting Process

Three-dimensional reconstruction of anomalous eutectic in laser remelted Ni-30 wt.% Sn alloy

Mechanical Behavior of Al–Al2Cu–Si and Al–Al2Cu Eutectic Alloys

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