纳米晶固体中的共格晶界滑移和迁移过程。

Cooperative grain boundary sliding and migration process in nanocrystalline solids.

机构信息

Institute of Problems of Mechanical Engineering, Russian Academy of Sciences, Bolshoj 61, Vasilievskii Ostrov, St. Petersburg 199178, Russia.

出版信息

Phys Rev Lett. 2010 Jul 30;105(5):055504. doi: 10.1103/PhysRevLett.105.055504.

DOI:10.1103/PhysRevLett.105.055504

PMID:20867932

Abstract

A new physical mechanism or mode of plastic deformation in nanocrystalline metals and ceramics is suggested and theoretically described. The mode represents the cooperative grain boundary (GB) sliding and stress-driven GB migration process. It is theoretically revealed that the new deformation mode is more energetically favorable than "pure" GB sliding and enhances the ductility of nanocrystalline solids in wide ranges of their structural parameters.

摘要

提出并理论描述了纳米晶金属和陶瓷中一种新的塑性变形物理机制或模式。该模式代表了晶界（GB）协同滑动和应力驱动的 GB 迁移过程。理论揭示了新的变形模式比“纯”GB 滑动更具能量优势，并在纳米晶固体的广泛结构参数范围内提高了它们的延展性。