dendrite growth model
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Crystals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 478
Author(s):  
Xiao-Hong Wang ◽  
Duo Dong ◽  
Xiao-Hong Yang

The effect of high pressure on the microstructure of hypo-peritectic Al–38wt.%Ni alloy was studied. The results show that Al3Ni and Al3Ni2 phases coexist at ambient pressure. However, it becomes a typical hyper-eutectic microstructure when synthesized at 2 GPa and 4 GPa. Meanwhile, the interface temperature of Al3Ni and Al3Ni2 phases was calculated with the combination of the BCT dendrite growth model, which is suitable for the Al3Ni2 phase. According to the highest interface temperature principle, the result shows that the Al3Ni phase dominates over 1–5 GPa. Finally, the Debye temperature and potential energy of the hypo-peritectic Al–38wt.%Ni alloy under different pressures were researched. Based on the low temperature specific heat-capacity curve. The Debye temperatures at ambient pressure, 2 GPa, and 4 GPa are 504.4 K, 508.71 K and 515.36 K, respectively, and the potential energy in the lowest point decreases with the increase of pressure.


Metals ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 57 ◽  
Author(s):  
Zhao Guo ◽  
Jianxin Zhou ◽  
Yajun Yin ◽  
Xu Shen ◽  
Xiaoyuan Ji

The mesoscopic grain model is a multiscale model which takes into account both the dendrite growth mechanism and the vast numerical computation of the actual castings. Due to the pursuit of efficient computation, the mesoscopic grain calculation accuracy is lower than that of dendrite growth model. Improving the accuracy of mesoscopic grain model is a problem to be solved urgently. In this study, referring to the calculation method of solid fraction in microscopic dendrite growth model, a cellular automata model of 3D mesoscopic grain evolution for solid fraction calculated quantitatively at the scale of cell is developed. The developed model and algorithm validation for grain growth simulation is made by comparing the numerical results with the benchmark experimental data and the analytical predictions. The results show that the 3D grain envelopes simulated by the developed model and algorithm are coincident with the shape predicted by the analytical model to a certain extent. Then, the developed model is applied to the numerical simulation of solidification process of nickel-based superalloys, including equiaxed and columnar dendritic grain growth. Our results show good agreement with the related literature.


2017 ◽  
Vol 12 (01) ◽  
pp. 54-59
Author(s):  
Yew Chung Sermon Wu ◽  
A.Panimaya Selvi Isabel

2011 ◽  
Vol 189-193 ◽  
pp. 3815-3818
Author(s):  
Zheng Chen ◽  
Feng Liu ◽  
Cheng Jin Shen

A steady-state non-equilibrium dendrite growth model was extended for binary alloy assuming non-linear liquidus and solidus. Satisfactory agreement of the model prediction with the experimental data of Ni-0.7at.%B and Ni30Cu70 alloys was achieved. The velocity plateau as experimentally observed in the velocity versus undercooling is quantitatively analyzed in terms of this model. Accordingly, the initiating point (i.e. corresponding to the critical velocity of absolute solutal stability VC*) and the ending point (i.e. corresponding to the velocity of maximal tip radius VRm) of the plateau are characterized.


2010 ◽  
Vol 654-656 ◽  
pp. 1359-1362 ◽  
Author(s):  
Shaun McFadden ◽  
Paul L. Schaffer ◽  
Ragnvald H. Mathiesen ◽  
David J. Browne

The Lipton Glicksman Kurz (LGK) growth model is commonly used to predict growth rates for equiaxed dendrites in solidifying mushy zones. However, the original LGK method treats an isolated dendrite growing in an infinite volume of liquid. In an equiaxed mushy zone, with multiple nucleation events, thermal and solutal interactions take place between the equiaxed dendrites. A modified version of the LGK model was developed that allows for measurement of the solute build-up ahead of the dendrites. To investigate the validity of the model, comparisons are made with results obtained from in-situ synchrotron X-ray videomicroscopy of solidification in a Bridgman furnace of an Al-12wt.%Ge alloy inoculated with Al-Ti-B grain refiner. Comparisons between the original LGK and modified LGK models are presented for discussion. The modified LGK model shows realistic tip temperature trends.


2006 ◽  
Vol 46 (6) ◽  
pp. 909-913 ◽  
Author(s):  
Masaki Nakagawa ◽  
Yukinobu Natsume ◽  
Kenichi Ohsasa

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