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题名: Strengthening Materials by Engineering Coherent Internal Boundaries at the Nanoscale
作者: K. Lu;  L. Lu;  S. Suresh
发表日期: 2009
摘要: Strengthening materials traditionally involves the controlled creation of internal defects and boundaries so as to obstruct dislocation motion. Such strategies invariably compromise ductility, the ability of the material to deform, stretch, or change shape permanently without breaking. Here, we outline an approach to optimize strength and ductility by identifying three essential structural characteristics for boundaries: coherency with surrounding matrix, thermal and mechanical stability, and smallest feature size finer than 100 nanometers. We assess current understanding of strengthening and propose a methodology for engineering coherent, nanoscale internal boundaries, specifically those involving nanoscale twin boundaries. Additionally, we discuss perspectives on strengthening and preserving ductility, along with potential applications for improving failure tolerance, electrical conductivity, and resistance to electromigration.
KOS主题词: strain rate sensitivity;  Stacking fault energy;  COPPER ALUMINUM ALLOYS;  Alloys;  Nanocrystalline metals;  Mechanical properties;  ACTIVATION;  Volume;  Copper;  Bauschinger effect;  Behavior
刊名: Science
相关网址: <Go to ISI>://WOS:000265221600031
Appears in Collections:中国科学院金属研究所_期刊论文

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Recommended Citation:
K. Lu,L. Lu,S. Suresh. Strengthening Materials By Engineering Coherent Internal Boundaries At The Nanoscale[J]. Science,2009,324(5925):349-352.

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