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the growth process of multi-dendrites with various preferential orientations and can reproduce a wide range of complex dendritic growth phenomena such as nucleation, coarsening of dendrite arms, side branching... Technology, School of Materials Science and Engineering, Tsinghua University摘 要:Since the characteristic of dendrite is an important factor determining......
造;结晶压力;二次枝晶间距;壁厚 中图分类号:TG249.2 文献标志码:A Effect of crystallization pressure on secondary dendrite arm spacing of vacuum counter-pressure casting aluminum alloy YAN Qing-song... pressure on the secondary dendrite arm spacing of vacuum counter-pressure casting ZL114A aluminum alloy was studied through testing and analyzing the secondary dendrite arm spacing (SDAS) subjected......
超声振动对SCN-3%ETH模拟合金定向凝固的影响段萌萌1,陈长乐1(1.陕西省西安市西北工业大学理学院陕西省凝聚态结构与性质重点实验室)摘 要:研究了27.5 kHz高频超声振动下SCN-3%ETH(Succinonitrile-3%ethanol,质量分数)模拟合金的定向凝固过程.结果表明,超声作用时界面出现钝化,曲率半径随超声作用时间的增加不断增大;撤去超声振动后,界面上形成被细化的胞晶组织;由于空化效应产生的瞬时高温高压的冲击破坏和声流的搅拌作用以及强迫振动的剪切作用,部分枝晶尖端断裂;界面生长速度随超......
of solidification rate.The dendrite growth of faceted Al2 O3 and non-faceted GAP phases are well predicted by KGT model,which have introduced appro p riate dimensionless supersaturation Ω to characterize...Phase growth patterns for Al2O3/GdAlO3 eutectics over wide ranges of compositions and solidification ratesWeidan Ma,Jun Zhang,Haijun Su,Guangrao Fan,Min Guo,Lin Liu,Hengzhi FuState Key Laboratory......
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基于两套网格的CA方法模拟铸造镁合金凝固过程枝晶形貌演化霍亮1,韩志强2,柳百成2(1.北京市清华大学机械工程系先进成形制造重点实验室2.清华大学 机械工程系 先进成形制造教育部重点实验室)摘 要:提出了一种基于两套网格的元胞自动机(CA)模型,用来模拟铸造镁合金凝固过程的枝晶形貌演化.模型中采用的两套网格,一套为四边形正交网格,用来求解溶质扩散方程;另一套为正六边形网格,用来进行CA方法的计算,以反映镁合金枝晶形貌的六重对称特征.模型中,枝晶尖端生长驱动力由界面平衡溶质浓度和求解扩散方程得出的界面实际溶质浓度......
techniques. Both the transition from dendrite to dispersive structure and corresponding scale evolution were revealed and further elucidated in terms of the heat flow mode, nucleation and growth... with the formation of one nucleation event and then, rapid growth of primary phase is expected due to larger thermal undercooling in front of the liquid-solid interface. Consequently, the radial-like dendrite forms......
, and studied the effect of Fe content on the dendrite growth direction. CIFTCI et al [6] quantified the amorphous fraction of atomized powders and computed the critical cooling rate of approximately 5000 K/s... microscope (BSEM). For each micrograph, four lines perpendicular to the growth direction of secondary dendrite were drawn across the particle microstructure. The number of cell/dendrite intercepts (n......
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