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Phase-field simulation of dendritic growth for binary alloys with complicate solution models LI Xin-zhong(李新中), GUO Jing-jie(郭景杰), SU Yan-qing(苏彦庆), WU Shi-ping(吴士平), FU Heng-zhi(傅恒志) (School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 15001, China) Abstract: A phase-field method for simulation of dendritic growth in binary alloys with complicate solution......
). The results show that severe dendritic segregation exists in the as-cast 2026 alloy and the main secondary phases at grain boundary are S (Al2CuMg) and θ (Al2Cu) phases. Elements Cu, Mg and Mn... parameter is at 490 °C for 24 h, which is consistent with the result of homogenization kinetic analysis. Key words: 2026 aluminum alloy; dendritic segregation; homogenization; microstructure evolution......
of slab section and secondary dendritic arm spacing were investigated, and the relationship between arm spacing and cooling rate of steel as well as the central carbon segregation of slab were... on casting speed and grain radius. Secondary dendritic arm spacing is formed and increased in mushy zone, and it presents an exponential trend with cooling rate. Central carbon segregation distributes......
微量Zr/B/Ti对C71500合金铸态组织和力学性能的影响童庆坤1,郭宏1,郭明星1,黄国杰1(1.北京市北京有色金属研究总院)摘 要:通过硬度测试,金相和电镜观察,能谱分析以及差热分析等方法研究微量元素Zr,Ti和B对C71500合金铸态组织和性能的影响.结果表明,微量Zr,Ti和B对合金有明显的晶粒细化和性能强化作用.微量的B即可强烈地细化合金的铸造组织,Zr虽然也在一定程度上具有细化作用,但效果没有B明显.Ti和B的复合添加并没有在B的基础上进一步细化晶粒,但显著地提高合金的硬度.随着晶粒细化程度的提高......
Fabrication of 2D and 3D dendritic nanoarchitectures of CdS GU Li(谷 俐) Biological and Chemical Engineering College, Jiaxing University, Jiaxing 314001, China Received 14 March 2008; accepted 25...; Abstract: The controlled preparation of two-dimensional (2D) and three-dimensional (3D) dendritic nanostructures of CdS was reported. 2D dendritic patterns are obtained through......
velocity dependence of solute segregation, one should use both the parameter R and the angle θmax to describe the steady-state shape and the boundary. Along the dendritic interface from the tip (θ=0... speed. In order to analyze the effect of the interfacial normal velocity dependence of solute segregation on the dendritic solidification behavior, it is useful to calculate the average of partition......
: The solidification characteristics and the hot tearing susceptibility were investigated on two Ni-based superalloys for turbocharger turbine wheel, K418 and K419. The segregation behaviors of the alloying elements and the precipitation phases were also studied. The results show that the solidification behavior of K419 alloy is complicated when compared with K418 due to the interdendritic segregation......
and residual liquid, which is favourable to restrain dendritic segregation[13]. However, the greater the cooling rate is, the more the side-branches are developed, the more the solute salts out...]. Trans Nonferrous Met Soc China, 2006, 16(4): 760-765. [13] LI Jian-guo, CHU Shuang-jie, LIU Zhong-yuan, FU Heng-zhi. Effect of wide change of cooling rate on dendritic segregation of a directionally......
wt% at the central area. The cooling rates have a strong impact on the morphology and particle size of primary Al3Sc,but a weak influence on Sc segregation. The cusped cubic and dendritic primary...Segregation behaviors of Sc and unique primary Al3Sc in Al-Sc alloys prepared by molten salt electrolysisXuan Liu,Jilai Xue,Zhichao Guo,Cheng ZhangSchool of Metallurgical and Ecological Engineering......
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