Engineering of Grain Boundaries as a Method for Achieving the Ultimate (Theoretical) Strength of Nanocrystals

摘要

The engineering of grain boundaries is used for nanocrystalline Ti_(50)N i_(25)Cu_(25)-based alloys, and the introduction of 5-nm boride Ti_2B and TiB_2 nanoparticles into grain boundaries is shown to suppress low-tem perature grain-boundary sliding and shifts the range of an anomalous Hall-Petch relation toward small aver age nanocrystal sizes. As a result, the maximum normalized microhardness is increased by 20% and the the oretical limit of this characteristic is substantially approached.