Deformation and Fracture Mechanisms in Thin Films and Beryllium Intermetallics.

Abstract

The overall goal of this program was to investigate the mechanical properties of several Be intermetallics for the purpose of evaluating their suitability for high temperature structural applications. This program enabled the completion of research on the fracture toughness of thin films and the deformation behavior of Be12X compounds. The grant enabled the extension of previous thin film work to include tests of thin brittle films on elastic-plastic substrates in order to measure the fracture toughness of the film and the film substrate interface. The atomistic modeling had been focused on a study of the atomic arrangement in the core of several different types of dislocations in Be12X. This work was extended to examine the energetics of the transformation of the bct Be12X phase to the rhombohedral Be17X2 phase by the repeated faulting. There is the potential that this deformation operation could produce a structure with enhanced plasticity.

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Document Details

Document Type
Technical Report
Publication Date
Jun 20, 1995
Accession Number
ADA327257

Entities

People

  • John F. Hirth
  • Richard G. Hoagland

Organizations

  • Washington State University

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms

DTIC Thesaurus Topics

  • Contractors
  • Crystal Structure
  • Dislocations
  • Engineering
  • Films
  • Grain Boundaries
  • High Temperature
  • Materials
  • Materials Engineering
  • Mechanical Properties
  • Military Research
  • Plastic Properties
  • Substrates
  • Test Methods
  • Thin Films
  • Toughness
  • Universities

Readers

  • Materials Science and Engineering.
  • Mechanical Engineering/Mechanics of Materials.
  • Thin Film Deposition Science.