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the undercooling of melt. According to solidification principle, a large undercooling leads to more nuclei nucleated as much heterogeneous substrate that meets the requirements of nucleation. Meanwhile, the low... be controlled to be 500 mm. 3) The pouring temperature affects the undercooling of melt, and finally affects the heterogeneous nucleation rate. The slope angle and length of reactor alter the process......
kinetics; volume fraction; nucleation rate; [全文内容正在添加中] ......
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取向电工钢中MnS粒子析出形核行为 毛卫民1,安治国1 (1.北京科技大学新金属材料国家重点实验室,北京,100083;2.北京科技大学材料学系,北京,100083) 摘要:采用场发射扫描电子显微镜观察了取向电工钢中MnS粒子在热变形及不同温度保温后的析出形核行为.以经典的形核率理论为基础,确定了MnS粒子形核析出的更准确潜在位置密度,进而建立了改进的MnS析出形核模型.研究结果表明,MnS粒子主要在晶界和位错上形核,MnS在900℃析出时粒子密度最大.随热变形后保温温度的升高,位错密度及相应的MnS位错形核密度降低.理论计算与实验观察的结果符合良好. 关键词:取向电工钢; MnS析出; 形核率; 形核位置; grain-oriented electrical steels; MnS precipitation; nucleation rate; nucleation sites......
was used as an interlayer on the steel substrates by high velocity oxy-fuel spraying. The effects of methane content on nucleation, quality, residual stress and adhesion of diamond films were investigated. The results indicate that the increasing methane content leads to the increase in nucleation density, residual stress, the degradation of quality and adhesion of diamond films. Diamond films......
Engineering the epitaxial interface of Pt-CeO2 by surface redox reaction guided nucleation for low temperature CO oxidationChangjin Xu1,Yutong Wu1,Song Li1,2,Jun Zhou1,Jing Chen3,Min Jiang1,Hongda... structure facilitating the charge transfer between the neighboring parts remains a challenge.Herein, a guided nucleation strategy based on redox reaction between noble metal precursor and supportsurface......
ones.Key words:electropulsing; grain refinement; nucleation rate; TiAl alloy; TA15 alloy......
is realized through wireless local area network. The navigation control is implemented with the cooperation among heterogeneous Agents. Key words: mobile robot; distributed control; environmental perception; heterogeneous Agent 智能移动机器人是一类能够通过传感器感知环境和自身状态, 实现在有障碍物的环境中面向目标的自主运动, 从而完成一定作业功能的机器人系统[1]. 设计具有丰富感知能力, 复杂地形适应能力的移动机器人系统以及开放式的体系结构对未知环境中移动机器人导航控制的理论与方法研究至关重要[2-4]. 为此,作者设计并实现了一个以......
Metallurgy, Central South University, Changsha 410083, China) Abstract: The interfacial reaction characteristics of pressure sintering of Fe coating α-Si3N4 prepared by heterogeneous precipitation... compounds and Fe grains distributed between the Si3N4 grains obviously grow up. The experimental results can be explained by the thermodynamic analysis. Key words: heterogeneous precipitation-thermal......
