U.S.-Korea Cooperative Research on Properties, Transforma- tion Characteristics and Shape Memory Behavior of Grain Re- fined Copper-Zinc-Aluminum Alloys

这一建议要求资金允许C博士。M.韦曼， 伊利诺伊大学冶金学教授， Myung-Chul Shin博士，精密金属研究实验室负责人， 韩国科学技术高级研究院， 24个月，一个关于财产的合作研究计划， 相变特性和形状记忆行为 晶粒细化的铜锌铝合金。 这些合金 通常为黄铜，按重量计含有约70%的铜， 铝。 他们展示了形状记忆效应， 在较低温度下变形的合金完全恢复其 在加热到较高温度时的初始未变形形状。 的 研究将涉及晶粒细化技术的应用 例如锆掺杂以减小晶粒尺寸 可成形性和抗疲劳性。 传输和分析 电子显微镜将被用来检查大概 富锆第二相颗粒在晶粒内并沿着 晶界，而颗粒的化学成分 将通过分析型电子显微镜微量分析测定。 相干程度、应变场和其他力学方面 的粒子将被确定使用透射电子 显微镜 研究的宏观方面将包括 根据晶粒尺寸与 疲劳、相变温度和形状记忆程度 在晶粒细化合金中。 这项研究是重要的，因为广泛的兴趣， 形状记忆合金在控制器，紧固件， 电子系统、医疗假肢、执行器和其他 用于运输、计算机、机械、农业、 能源、建筑和其他制造业集团。 这个项目是 与美国的目标相关-韩国合作科学 该计划旨在提高合作水平， 美国和韩国的科学家和工程师通过交流， 科学信息、思想、技能和技术， 在互惠互利的问题上进行合作。 美国和韩国 合作者都是备受尊敬的科学家， 在该领域的研究经验和富有成效的出版记录 的提案。

This proposal requests funds to permit Dr. C. M. Wayman, Professor of Metallurgy, University of Illinois, to pursue with Dr. Myung-Chul Shin, Head, Precision Metals Research Laboratory, Korea Advanced Institute of Science and Technology, for a period of 24 months, a program of cooperative research on the properties, transformation characteristics, and shape memory behavior of grain-refined copper-zinc-aluminum alloys. These alloys are typically brasses, containing about 70% copper, by weight, and 2-8% aluminum. They demonstrate the shape memory effect through which an alloy deformed at some lower temperature completely recovers its initial undeformed shape upon heating to a higher temperature. The research will involve the application of grain refinement techniques such as zirconium doping to reduce grain size so as to improve formability and resistance to fatigue. Transmission and analytical electron microscopy will be used to examine presumably zirconium-rich second phase particles within the grains and along grain boundaries, while the chemical composition of the particles will be determined by analytical electron microscopy microanalysis. The degree of coherency, strain fields, and other mechanical aspects of the particles will be determined using transmission electron microscopy. Macroscopic aspects of the research will include characterization of the alloys in terms of grain size versus fatigue, transformation temperatures, and the extent of shape memory in the grain refined alloys. This research is important because of the broad range of interest in the applications of shape memory alloys to controls, fasteners, electronic systems, medical prosthetics, actuators, and other devices for transportation, computers, machinery, agriculture, energy, building, and other manufacturing groups. This project is relevant to the objectives of the U.S.-Korea Cooperative Science Program which seeks to increase the level of cooperation between U.S. and Korean scientists and engineers through the exchange of scientific information, ideas, skills, and techniques and through collaboration on problems of mutual benefit. The U.S. and Korean collaborators are highly respected scientists with extensive research experience and productive publication records in the field of the proposal.