Rapid dendritic growth and solute trapping within undercooled ternary Ni-5%Cu-5%Mo alloy

Chang, Jiang; Wang, H.P.; Zhou, K.; Wei, B.

doi:10.1007/s00339-012-7017-0

Cited by 24 publications

(10 citation statements)

References 9 publications

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“…Large heat extraction from the boundaries can enhance the dendrite microstructure formation with strong side branches, while large heat input at the boundaries prevents the dendrite growth as well as secondary arm formations. Similar results have been observed and reported in many experimental studies in recent years [31][32][33][34][35]. …”

Section: Effect Of Different Magnitudes Of Heat Fluxsupporting

confidence: 79%

Phase field simulation of dendrite growth with boundary heat flux

Zhang

2014

Integr Mater Manuf Innov

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Boundary heat flux has a significant effect on solidification behavior and microstructure formation, for it can directly affect the interfacial heat flux and cooling rate during phase transition. In this study, a phase field model for non-isothermal solidification in binary alloys is employed to simulate the free dendrite growth in undercooled melts with induced boundary heat flux, and an anti-trapping current is introduced to suppress the solute trapping due to the larger interface width used in simulations than a real solidifying material. The effect of heat flux input/extraction from different boundaries was studied first. With heat input from boundaries, the temperature can be raised and the dendritic morphology changed with gradient temperature distribution caused by the heat flux input coupling with latent heat release during the liquid-solid phase transition. Also, the concentration distribution can be also influenced by this irregular temperature distribution. Heat flux extraction from the boundaries can decrease the temperature, which results in rapid solidification with small solute segregation and concentration changes in the dendrite structures. Also, dendrite growth manner changes caused by undercooling variation, the result of competition between heat flux and latent heat release from phase transition, are also studied. Results indicate that heat flux in the simulation zone significantly reduces the undercooling, thus slowing down the dendrite formation and enhancing the solute segregation, while large heat extraction can enlarge the undercooling and lead to rapid solidification with large dendrite tip speed and small secondary dendrite arm spacing, while solute segregation tends to be steady. Therefore, the boundary heat flux coupling with the latent heat release from the solidification has an effective influence on the temperature gradient distribution within the simulation zone, which leads to the morphology and concentration changes in the dendritic structure formation.

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Section: Effect Of Different Magnitudes Of Heat Fluxsupporting

confidence: 79%

Phase field simulation of dendrite growth with boundary heat flux

Zhang

2014

Integr Mater Manuf Innov

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“…Solution of solute atoms can result in lattice distortion, increase the resistance of dislocation movement and improve the mechanical properties of alloys . Figure and 8 present the nanohardness and Young's modulus as a function of the measured point in coarse dendrites and equiaxed grains, respectively, which clearly formulates how solute distribution affects the mechanical properties of α (Fe) dendrites.…”

Section: Resultsmentioning

confidence: 94%

“…Because of the hardening effect of solid solution, the addition of alloying elements is more widely used to improve the application performance in materials design . Solubility extension in the process of rapid solidification suppresses the motion of dislocation owing to the lattice distortions and improves the mechanical properties of alloys.…”

Section: Introductionmentioning

confidence: 99%

Effect of Microstructure Evolution on Micro/Nano‐Mechanical Property of Fe–Co–Ni Ternary Alloys Solidified under Microgravity Condition

Liu

Chang

Wang

2018

steel research int.

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Rapid solidification of highly undercooled Fe–Co–Ni alloys is realized by drop tube technique. The microstructures of Fe–10%Co–10%Ni, Fe–15.6%Co–12%Ni, and Fe–10%Co–20%Ni alloys are all composed of single α(Fe) solid solution phase, which are confirmed by the results of XRD and DSC. With the decrease of droplet diameters, the cooling rate and undercooling increase, meanwhile, the microstructural characteristic of α(Fe) phase transforms from coarse dendrites to equiaxed grains. The size of coarse dendrites decreases to one tenth for the refined equiaxed grains. Employing the Vickers hardness and nano indenter techniques, the mechanical properties of α(Fe) dendrites are investigated. The average Vickers microhardness of α(Fe) phase is remarkably enhanced with the decrease of the grain size. Due to the more homogenous solute distribution in the dendrite trunks, the nanohardness presents a gentle fluctuation. Once the droplet diameter exceeds a critical value, the solutes concentrate at the grain boundaries. As a result, the closer the indenters to the grain boundary, the larger the nanohardness.

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“…It is of great signicance to study the variation in melt structures with temperature in the deep undercooling of metal melt for understanding the mechanism of metal solidication and facilitating the process. [1][2][3][4][5][6][7] The macroscopic properties of metals are mainly determined by their microstructure, while the solid structure of materials is closely related to the microstructure of their liquid matrix; therefore, the solid structure of a material is closely related to the microstructure of its parent liquid. 8,9 Materials scientists have been researching the correlation between the liquid structure and its corresponding solid structure; however, this has not yet been established due to the uncertainty of the liquid metal structure and many difficulties associated with the determination.…”

Section: Introductionmentioning

confidence: 99%