GOALI: Friction Stir Forming Process for Joining Dissimilar Metals

GOALI：用于连接异种金属的搅拌摩擦成形工艺

• 批准号: 1131845
• 负责人: Scott Miller
• 金额: $ 28.47万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-01 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1131845&HistoricalAwards=false
• 关键词: GOALI; Friction; Stir; Forming; Process

This Grant Opportunity for Academic Liason with Industry (GOALI) award supports the study of a new forming process to create a mechanical joint between dissimilar materials. Friction stir forming will be studied by experimental, modeling, and material analyses. The intrinsic process forces and temperature will be measured. The effect of process parameters on the material deformation and joint strength will be experimentally investigated. A more accurate modeling prediction of thermo-mechanical material behavior will be made. A complete metallurgical analysis will be conducted to characterize the effect of friction stir forming on the work material grain structure. This new, efficient process has a relatively small environmental footprint and will be capable of simultaneously heating and forming the work material into a strong dissimilar material joint. If successful, this new joining process will result in a stronger, lighter joint made entirely from the parent material in a variety of dissimilar materials. The process is a quick one-step process without the need for external fasteners, fluids, or any other material. In traditional joining methods, such as fusion processes, joint strength in dissimilar metal joints is limited. The major goal of this research is to establish the link among the force/heat input, material structure, material properties, and resulting joint strength. The nature of work material forming at high temperature will be fully characterized and the proposed work will contribute extensive knowledge about material forming by friction stir processes. This research will stimulate new avenues and applications for friction stir processes, and make them suitable for a wide range of materials. General Motors is a partner in the research and will implement the process into the manufacture of their automotive body structures.

该学术与工业联络机会 (GOALI) 奖项支持研究一种新的成型工艺，以在不同材料之间创建机械接头。 将通过实验、建模和材料分析来研究搅拌摩擦成形。 将测量固有过程力和温度。 将通过实验研究工艺参数对材料变形和接头强度的影响。 将对热机械材料行为进行更准确的建模预测。 将进行完整的冶金分析，以表征搅拌摩擦成形对工件材料晶粒结构的影响。 这种新的高效工艺对环境的影响相对较小，并且能够同时加热工作材料并将其成型为坚固的异种材料接头。如果成功，这种新的连接工艺将产生完全由各种不同材料的母材制成的更坚固、更轻的接头。该过程是一个快速的一步过程，无需外部紧固件、流体或任何其他材料。 在传统的连接方法中，例如熔合工艺，异种金属接头的接头强度是有限的。 这项研究的主要目标是建立力/热输入、材料结构、材料特性和由此产生的接头强度之间的联系。 高温下工作材料成形的性质将得到充分表征，并且所提出的工作将贡献有关搅拌摩擦过程材料成形的广泛知识。 这项研究将激发搅拌摩擦过程的新途径和应用，并使其适用于多种材料。 通用汽车是该研究的合作伙伴，并将将该工艺应用到其汽车车身结构的制造中。