Experimental and Theoretical Investigations of Nanostructured Materials and Composites.

Abstract

An interdisciplinary research program was conducted to understand the mechanisms of deformation and fracture in nanostructured materials. Experiments on thin film nanostructured metals found that deformation occurred by grain boundary sliding and grain rotation in nanostructured gold deformed at room temperature, with grain sizes less than 25 nm. Bulk iron-copper nanostructures with grain sizes in the 100 nm size range exhibited perfectly plastic behavior and intense shear banding as the primary deformation mechanism. A variety of modeling techniques were conducted to determine the effects of grain size on strength, and to determine the constitutive behavior of nanostructured metals. Models of gradient plasticity and elasticity were also developed for traditional materials and thin films. (MM)

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1995
Accession Number
ADA303563

Entities

People

  • Elias C. Aifantis
  • Stephen A. Hackney
  • Walter W. Milligan

Organizations

  • Michigan Technological University

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Boundaries
  • Composite Materials
  • Elastic Properties
  • Films
  • Grain Boundaries
  • Grain Size
  • Materials
  • Nanomaterials
  • Nanostructures
  • Physical Properties
  • Plastic Properties
  • Rotation
  • Temperature Gradients
  • Thin Films

Fields of Study

  • Physics

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Nanoscale Plasmonic Nanotechnology
  • Powder metallurgy of Titanium alloys.

Technology Areas

  • Microelectronics