2010 Fiscal Year Final Research Report

Effect of boundary misorientation, grain size distribution and dislocation density on tensile behavior of nanostructured metals

Research Project

Project/Area Number	21860010
Research Category	Grant-in-Aid for Research Activity Start-up
Allocation Type	Single-year Grants
Research Field	Material processing/treatments
Research Institution	Tohoku University
Principal Investigator	KAMIKAWA Naoya Tohoku University, 金属材料研究所, 助教 (30530894)
Project Period (FY)	2009 – 2010
Keywords	超微細粒材料 / 超強加工 / 力学特性 / 強化機構
Research Abstract	The effect of boundary misorientation on tensile behavior of nanostructured aluminium produced by ultrahigh strain deformation and annealing has been investigated. The strength of ultrafine grained samples mainly surrounded by high-angle boundaries is much higher than that of subgrained samples mainly composed of low-angle boundaries, indicating that high-angle boundaries are more effective for strengthening than low-angle boundaries. It has also been suggested that yielding mechanisms in nanostructured metals is different depending on the boundary misorientation distribution in the samples.