Thermal Management of Reinforcements for Novel Microstructures and Interfaces in Cast Metal Matrix Composites

铸造金属基复合材料中新型微观结构和界面增强材料的热管理

• 批准号: 9821057
• 负责人: Pradeep Rohatgi
• 金额: $ 21.79万
• 依托单位: University of Wisconsin-Milwaukee
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-10-01 至 2005-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9821057&HistoricalAwards=false
• 关键词: Thermal; Management; Reinforcements; Novel; Microstructures

In this research, new microstructures and interfaces will be created in selected aluminum matrix composites by extracting heat through reinforcing fibers. Heat transfer and fluid flow analysis will be done to design experiments on extracting heat through reinforcing fibers during solidification of an already infiltrated composite. Experiments will be done with carbon fibers in aluminum- 4.5% Copper alloy. A tow of carbon fibers will be infiltrated, with a portion of the tow extending out of the casting. The aluminum carbon composite sample will be placed in a crucible, with the tow of fibers extending out of the melt, remelted and resolidified with the portion of the tow extending out of the composite, acting as a source of heat extraction. Metallographic examination of the composites will be done after resolidification to determine the nature of the interface, thickness of the primary phase layer, grain size, and dendrite size as a function of the processing parameters. The experimental observations will be used to validate and modify the theoretical work onextraction of heat through reinforcing fibers. The experimental results obtained in this study will include characterization of new type interfaces and matrix microstructures formed in the composites when heat is extracted through reinforcing fibers. The knowledge base could lead the way for improved composites with novel matrix microstructures and interfaces produced by heat extraction through the fibers.

在这项研究中，新的微观结构和界面将在选定的铝基复合材料通过提取热量通过增强纤维。将进行传热和流体流动分析，以设计在已经渗透的复合材料固化期间通过增强纤维提取热量的实验。实验将用铝-4.5%铜合金中的碳纤维进行。 碳纤维丝束将被渗透，丝束的一部分延伸出铸件。 将铝碳复合材料样品放置在坩埚中，纤维束从熔体中伸出，再熔化并重新凝固，其中纤维束的一部分从复合材料中伸出，作为热提取源。在再凝固后对复合材料进行金相检查，以确定界面的性质、主相层的厚度、晶粒尺寸和枝晶尺寸作为工艺参数的函数。实验观察将被用来验证和修改理论工作onextraction热量通过增强纤维。在这项研究中获得的实验结果将包括表征的新型界面和基体的复合材料中形成的微观结构时，通过增强纤维提取热量。 该知识库可以为具有新型基体微观结构和通过纤维热提取产生的界面的改进复合材料指明方向。