U.S.-Czech Materials Research on Dynamic Embrittlement of Bicrystals

美捷双晶动态脆化材料研究

• 批准号: 9414328
• 负责人: Charles McMahon
• 金额: $ 3.6万
• 依托单位: University of Pennsylvania
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-09-15 至 1999-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9414328&HistoricalAwards=false
• 关键词: U.S.; Czech; Materials; Research; Dynamic

9414328 McMahon The primary objective of this U.S.-Czech research project between Dr. Charles McMahon of the University of Pennsylvania and Dr. Pavel Lejcek of the Institute of Physics of the Czech Academy of Sciences is to study the type of brittle cracking that takes place in high-strength materials under conditions where a mobile element exists on the surface. To do this, the researchers will measure crack-growth rates in specially prepared bicrystals of Fe-Si alloys as a function of direction in the grain boundary. This will be done because the rate of diffusion along a boundary can vary greatly with direction. Results are expected to yield and validate a model useful in calculating the rate of crack advance. In the process, the researchers also hope to establish a general method of inhibiting this type of cracking. Success should contribute to our knowledge of problems associated with stress-relief cracking in welds in alloy-steel components and in various types of hot-deformation processing. This project in materials research fulfills the program objective of advancing scientific knowledge by enabling experts in the United States and Eastern Europe to combine complementary talents and share research resources in areas of strong mutual interest and competence. ***

小行星9414328 美国的主要目标是-宾夕法尼亚大学的Charles McMahon博士和捷克科学院物理研究所的Pavel Lejcek博士之间的捷克研究项目是研究高强度材料在表面存在移动的元素的条件下发生的脆性开裂类型。 为此，研究人员将测量专门制备的Fe-Si合金双晶中的裂纹生长速率，作为晶界方向的函数。 之所以这样做，是因为沿着边界的扩散速率随方向变化很大。 结果预计产量和验证模型有用的计算裂纹前进的速度。 在这个过程中，研究人员还希望建立一种抑制这种类型开裂的通用方法。 这一成功将有助于我们了解合金钢构件焊缝和各种热变形加工中与应力消除裂纹有关的问题。 该材料研究项目通过使美国和东欧的专家能够联合收割机互补人才并在共同感兴趣和能力强的领域共享研究资源，实现了推进科学知识的计划目标。 ***