Crack Nucleation Due to Non-equilibrium Grain Boundaries in Random Polycrystals

这个项目是研究多晶材料的局部非均质性及其对裂纹起裂的影响。特别是，某些非平衡晶界结构和形态及其相关的成核应力和由此产生的裂纹特征将被研究。有证据表明，这些非平衡晶界存在于亚微米和纳米晶材料中。结果将普遍适用于金属体系和某些陶瓷材料。* * *

9523028 Wu This project is to study the local heterogeneities in polycrystalline materials and their effect on crack initiation. In particular, certain non-equilibrium grain boundary structures and morphologies and their associated nucleation stresses and resulting crack characteristics will be investigated. There exists some evidence that these non-equilibrium grain boundaries are found in submicron-grained and nanocrystalline materials. The results will be generally applicable to metallic systems and to certain ceramic materials. ***