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of undercooling. The critical undercooling for this transition increases with the rise of Mo content in the alloy. Key words: undercooling; rapid solidification; solute trapping; dendrite growth; drop tube...制生长向热扩散控制生长的转变,且前者所需的临界过冷度小于后者的. 图8 不同合金中α-Fe枝晶的生长速率和顶端半径随过冷度的变化关系 Fig.8 Calculated growth velocity and tip radius of α-Fe dendrite in undercooled Fe-Mo alloys 经过对比发现,在相同的过冷条件下,α-Fe枝晶在......
:A Effects of Bi doping on electrochemical corrosion and dendrite growth suppression of lead-free Sn-3.0Ag-0.5Cu solder HUA Li1, 2, 3, GUO Xing-peng1, YANG Jia-kuan2 (1. School of Chemistry and Chemical.... School of Chemistry and Life Science, Hubei University of Education, Wuhan 430205, China) Abstract: The effects of Bi doping on the electrochemical corrosion characteristics and dendrite growth......
results in the precipitation of Al-Sr. Moreover, Sr addition results in a fact that the secondary dendrite arm spacing (DAS) of the primary α-Mg phase is obvious refined. Microstructure.... The as-extruded LAM830-0.5Sr alloy exhibits an optimal elongation of 22.43% and as-extruded LAM830-0.75Sr alloy shows an optimal tensile strength of 265.46 MPa. Key words: Mg-Li alloy; dendrite arm spacing......
with phase field model. The phase field model, solution algorithm and the program of dendrite growth are introduced. The definition of initial condition, boundary condition and the stability condition... simulated results and investigations by others are also presented. It is proved that the dendrite morphologies are similar in trunks and arms growth, so the developed phase field program is accurate. Key......
测结果一致.成分分析表明,相同稳态条件下枝晶的一次间距变小,偏析也有所降低. 关键词:单晶高温合金; 生长速率; 跃迁; 一次间距; 微观偏析; single crystal superalloy; growth rate; transition; primary dendrite arm spacing; microsegregation; [全文内容正在添加中] ......
Metallurgica, 1986, 34(5): 823-830. [22] WANG H F, LIU F, CHEN Z, YANG G C, ZHOU Y H. Analysis of non-equilibrium dendrite growth in a bulk undercooled alloy melt: Model and application[J]. Acta... rosette to polygon, accompanied by the disappearance of divorced eutectic β-Mg17Al12 phase at grain boundary. According to the theoretical calculation of dendrite growth and solute trapping model......
of an axial high magnetic field on Sn dendrite morphology of Pb-Sn alloys during directional solidification[J]. Journal of Alloys and Compounds, 2014, 588: 190-198. [4] KURZ W, FISHER D J. Dendrite growth.../s. Indeed, dendrite to cell transition follows this sequence: dendrites→banded cellular dendrites→elongated cells and part of dendrites→main elongated cells and little dendrites. Moreover......
and one way of dendrite evolution in twin plane was shown schematically. Key words: unidirectional solidification; twinned dendrite; growth direction; aluminum alloy 1 Introduction The solidification... segregation, recently, a divergence with respect to actual growth direction of twinned dendrite trunk along with either <110> or <112> direction has still remained a question, and the same  ......
Society, 1979: 3. [2] KURZ W, FISHER D J. Dendrite growth at the limit of stability: tip radius and spacing[J].Acta Metallurgica, 1981, 29: 11-20. [3] TRIVEDI R. Interdendritic spacing: Part...): 1042-1050. [23] LAZARO B S, STEFANESCU D M. A quantitative dendrite growth model and analysis of stability concepts[J]. Metallurgical and Materials Transactions A, 2004, 35: 2471-2485. [24] DANTZIG J......
竞争生长激烈,枝晶形态复杂,枝晶偏析和晶界偏析显著. 关键词:Ni-Cr二元合金;柱状枝晶;焊接熔池;元胞自动机;数值模拟 中图分类号:TG 111.4 文献标识码: A Simulation of columnar dendrite grain growth in weld pool of Ni-Cr binary... distribution during the growth processes were studied. The simulated results reproduce the growth of secondary and tertiary dendrite arms, the competative growth and the grain boundary segregation......