【摘 要】
：
A mathematical model for the undercooling of the metal droplet during the rapid solidification is established, by which the factors that influence the undercool
【机 构】
：
School of Materials Science and Engineering
【基金项目】
：
国家自然科学基金;上海市科委资助项目
论文部分内容阅读
A mathematical model for the undercooling of the metal droplet during the rapid solidification is established, by which the factors that influence the undercooling of the metal droplet during the rapid solidification are analyzed, and the parameter ζ＝σSL3/ (TLΔH 2 ) is defined as the impact factor of the undercooling for the droplet solidification. Different undercoolings of droplets induced by various rapid solidification conditions are mainly ascribed to the change of the impact factor. Moreover, it is shown that the larger of ζ, the higher the relative undercooling can be gained. Meanwhile, the parameters such as solid-liquid interfacial energy σSL and latent heat of solidification ΔH also vary with the rapid solidification conditions of droplets.
其他文献
Perhydropolysilazane, a low viscosity preceramic polymer with good wettability and high char yield, was used to fabricate three-dimensional silica fiber reinfor
A new co-gasification technology was proposed. The core of this co-gasification technology is a gasifier capable of being operated on a wide range of fuels and
由于BEPCⅡ储存环注入系统对冲击磁铁的设计要求比较高,国际上现有的两种低束流阻抗的冲击磁铁方案都不能完全满足其要求.本文提出的一种新型冲击磁铁方案解决了BEPCⅡ冲击磁
Enzyme-catalytic fluorescence determination of artemisinin (qinghaosu, QHS) was developed using pyronine B (PB) as substrate of horseradish peroxidase (HRP). Th
为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7
Evaluierung der Effektivit(a)t von Bletilla striata bei transerteriellenChemoembo lisation (TACE) im Kleintiermodell. Nach subkapsul(a)rer Implantation (Tag 0)
利用相对论平均场理论描述中子星的液体区域,Fermi气体模型或者FMT,BPS和BBP模型描述中子星外壳,分别称为Fermi gas+RMF和RMF*.计算了中子星性质并且和相对论平均场理论给出
本文推导了逐事件快度间隔的起伏与逐事件快度关联的关系. 分析表明:快度间隔分析中新的和有意义的部分是推广的两粒子快度关联矩.对于一些特殊的两粒子和矩阶数这些矩有明确
A Burgess Shale-type biota is, in part, characterized by a wide diversity of taxa and soft-part preservation.Each provides unique historical insights into early
利用非对称核物质状态方程及同位旋相关的量子分子动力学模型对有限核112Sn和132Sn在不同温度下多重碎裂的同位旋效应进行了研究,发现随着温度的升高同位旋效应逐渐消失,并给