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effect in directional solidification can be remarkable when the equilibrium distribution coefficient (k0) value is less than 0.65 due to the strong affinity of Cu for some metallic and non-metallic...Study of ultrahigh-purity copper billets refined by vacuum melting and directional solidificationFU Yaboa, b, CHEN Jiea, b, LIU Ninga, b, LU Yipinga, b, LI Tingjua, b, and YIN Guomaoa, b a Key......
包晶合金定向凝固过程中的对流效应及带状组织形成机制 Ⅰ.实验结果骆良顺1,2,张宇民1,苏彦庆2,王新2,郭景杰2,傅恒志2(1.黑龙江省哈尔滨市哈尔滨工业大学材料科学与工程学院2.黑龙江省哈尔滨市哈尔滨工业大学特种环境复合材料技术国防科技重点实验室)摘 要:利用电阻加热和感应加热Bridgman定向凝固系统对非小平面包晶系模型合金Fe-Ni合金进行系统的定向凝固实验研究,探索2种常规定向凝固条件下对流对包晶合金定向凝固过程中带状组织和宏观偏析的影响规律.发现在高G/V定向凝固过程中,对流使包晶合金定向凝固过程......
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the cooling rate is high. 关键词:nucleation & growth; casting; directional solidification; [全文内容正在添加中] ......
,Shanghai University摘 要:The effects of forced flows at different velocities on microstructure and solute distribution during the directional solidification...Evolution of the microstructure and solute distribution of Sn-10wt% Bi alloys during electromagnetic field-assisted directional solidificationZhe Shen,Minghu Peng,Dongsheng Zhu,Tianxiang Zheng,Yunbo......
高温度梯度定向凝固镍基高温合金DZ125的组织演化闵志先1,沈军1,熊义龙1,王伟1,杜玉俊1,刘林1,傅恒志1(1.陕西省西安市西北工业大学凝固技术国家重点实验室)摘 要:采用液态金属冷却(LMC)定向凝固结合液淬法,在温度梯度(G)为250K/cm,凝固速率(V)为2-400μm/s的条件下系统研究了镍基高温合金DZ125的固/液界面形态,胞/枝晶间距及MC碳化物形态.随着V的增大,界面形态经历了浅胞状→深胞状→粗枝晶→细枝晶的转变.一次胞晶间距随着V的增大而增大,当V=5μm/s时,固/液界面达到胞枝转变......
定向凝固镍基高温合金DZ125平界面生长的微观组织演化闵志先1,沈军1,王灵水1,冯周荣1,刘林1,傅恒志1(1.陕西省西安市西北工业大学凝固技术国家重点实验室)摘 要:采用液态金属冷却(LMC)定向凝固技术,对镍基高温合金DZ125在凝固速率为1.5μm/s的条件下其平界面生长的微观组织演化规律进行了研究.结果表明:凝固组织演化经历3个不同的阶段,当凝固分数fs≤0.26时,为单相γ组织,基体中零星分布着细小的颗粒状的未熔HfC;当0.26<fs<0.86时,为γ/MC共生组织,MC为纤维状或者板......
定向凝固过程中Ti-47Al-2Cr-2Nb合金与Y2O3陶瓷的相互作用张花蕊1,高明1,唐晓霞1,张虎1(1.北京市北京航空航天大学材料科学与工程学院)摘 要:本文研究了定向凝固条件下Ti-47Al-2Cr-2Nb合金与Y2O3/Al2O3双层结构陶瓷管内层Y2O3的相互作用.结果表明,Y2O3层有效地阻隔了化学稳定性较差的Al2O3外层与TiAl合金熔体的接触,从而避免了Al2O3与TiAl之间的化学反应.合金铸棒内含有平均体积分数约为0.14%的少量Y2O3夹杂物,主要是由于在定向凝固实验初期阶段Y2O3......
. The solidification on the interstice scale was regarded as a directional solidification. Then, the concept of the character length (Lc) was forward, which described the size of the reinforcement local influential... be regarded as directional solidification. Before the application of following mathematical model, there are some assumptions. Firstly, the matrix is the pure metal and does not nucleate on the surface......
A. Evaluation of heat transfer coefficients during upward and downward transient directional solidification of Al-Si alloys [J]. Struct Multidisc Optim, 2006, 31(3): 241-248. [23] Sun H C, Chao L S. Analysis... Trans. Nonferrous Met. Soc. China 22(2012) 139-146 Thermo-Calc and T-fS-CL coupling based method to determine solidification paths of alloys solidified under condition of Biot0.1 Zhao Guang-wei1, LI......