The rapid solidification of an AL-10wt%Si-Sc alloy

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• 批准号: 485977-2015
• 负责人: Henein, Hani
• 金额: $ 4.35万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=653434
• 关键词: rapid; solidification; AL; 10wt; Si

Solidification of alloys is a complex phenomenon arising in many modern experimental techniques and industrial technologies related to casting and surfaces processing. The variation of different conditions of solidification (such as undercooling or cooling rate) gives a possibility to control the morphology and size of crystal structure, which substantially influence physical and chemical properties of alloys. In particular, deep undercooling of alloys below equilibrium liquidus, and eutectics results in rapid solidification and yields materials with improved mechanical, magnetic and electrical properties. The proposed 3 year project is a collaboration between Equispheres and the Univ. of Alberta. We will generate powder samples using Impulse Atomization (IA) - a single fluid rapid solidification technique. Al-Si (Sc) alloys will be generated. The latter is expected to be supersaturated in the alpha matrix due to undercooling. The solidified samples will be **characterized using SEM, X-Ray diffraction, differential scanning calorimetry and microhardness. In addition, state of the art characterization such as 3D-micro and nano-tomography and Neutron Diffraction will be carried out. The internal dendritic structure of a rapidly solidified droplet will be modeled using a microsegregation model. The characterization data collected will be used to verify the model. We will provide a basis for understanding the solidification structure resulting from solidification processes such as3D printing and high pressure die casting where cooling rates and heat fluxes are similar to IA. The proposed alloy systems are important for automotive and aerospace applications where Canada **plays a major role in production and manufacturing. One graduate student will be trained in Canada.**

合金凝固是与铸造和表面处理相关的许多现代实验技术和工业技术中出现的一种复杂现象。不同的凝固条件(如过冷或冷却速度)的变化使控制晶体结构的形态和尺寸成为可能，这对合金的物理和化学性能有很大的影响。特别是，合金的深度过冷低于平衡液相线和共晶会导致快速凝固，并产生具有更好的机械、磁和电性能的材料。拟议的3年项目是Equisphes和大学之间的合作项目。艾伯塔省。我们将使用脉冲雾化(IA)-一种单流体快速凝固技术来产生粉末样品。将产生Al-Si(Sc)合金。由于过冷，后者有望在阿尔法矩阵中过饱和。用扫描电子显微镜、X射线衍射仪、差示扫描量热仪和显微硬度计对固化样品进行了表征。此外，还将进行最先进的表征，如3D-微米和纳米层析成像和中子衍射。快速凝固液滴的内部枝晶结构将使用微观偏析模型来模拟。收集的表征数据将用于验证模型。我们将为理解3D打印和高压压铸等冷却速度和热流密度与IA相似的凝固过程所产生的凝固结构提供基础。建议的合金系统对汽车和航空航天应用非常重要，加拿大**在生产和制造中扮演着重要角色。一名研究生将在加拿大接受培训。**