U.S.-Korea Cooperative Research: The Application of Non- Destructive Techniques to Investigate Cavitation in Superplasticity

该提案要求资金允许特伦斯G博士。兰登， 南加州大学材料科学系 (USC)，与物理学教授Ho Chul Kim博士一起学习， 韩国科学技术高等研究院（KAIST）， 24个月，一个合作研究的应用程序 非破坏性技术来研究 超塑性 合作者将使用优秀的 在KAIST的设施进行样品的无损检测 由美国的测试实验室提供。 南加州大学没有KAIST的这类设施。 超塑性是指某些金属表现出 异常高的颈部自由伸长，通常超过 1,000%，当在高温下拉伸时。 这 这一现象具有相当大的历史意义，因为 在金属板成形中的任何潜在应用。 一个主要 超塑性中的问题是 内腔 这些空洞可能导致严重的 材料的后成形性能的退化。 的 合作者将试图获得间接信息， 作为试样历史和试验函数的空腔尺寸 程序. 他们还将尝试将 KAIST使用平行光学进行无损检测 在USC考试 合作者受到高度尊重 科学家在这个研究领域。 本项目 将使他们能够联合收割机结合他们的才能和兴趣， 互利该项目与以下目标有关： 美国-韩国合作科学计划，旨在 提高美韩合作水平 科学家和工程师通过科学交流， 信息、想法、技能和技术， 在互惠互利的问题上进行合作。 韩国 参与该项目是由韩国科学 工程基金会（KOSEF）。

This proposal requests funds to permit Dr. Terence G. Langdon, Materials Science Department, University of Southern California (USC), to pursue with Dr. Ho Chul Kim, Professor of Physics, Korea Advanced Institute of Science and Technology (KAIST), for 24 months, a program of cooperative research on the application of nondestructive techniques to investigate cavitation in superplasticity. The collaborators will use the excellent facilities at KAIST to perform nondestructive testing of samples provided by the testing laboratory in the United States. Facilities of the type at KAIST are not available at USC. Superplasticity refers to the ability of some metals to exhibit exceptionally high neck-free elongations, often in excess of 1,000%, when pulled in tension at elevated temperatures. This phenomenon is of considerable commerial interest because of the any potential applications in sheet-metal forming. A major problem in superplasticity is the nucleation and growth of internal cavities. These cavities may lead to a significant degradation of the post-forming properties of the material. The collaborators will attempt to obtain indirect information on cavity size as a function of both specimen history and testing procedures. They also will attempt to correlate results of nondestructive testing at KAIST with parallel optical examination at USC. The collaborators are highly respected scientists in the field of this research. The present project will allow them to combine their talents and interests for mutual benefit. This project is relevant to the objectives of the U.S.-Korea Cooperative Science Program which seeks to increase the level of cooperative between U.S. and Korea scientists and engineers through the exchange of scientific information, ideas, skills, and techniques and through collaboration on problems of mutual benefit. Korean participation in the project is supported by the Korea Science and Engineering Foundation (KOSEF).