In-Situ HVEM Investigation of Processes Leading to Fracture in Metals.

Abstract

The unique features of in-situ straining to fracture in high voltage electron microscopes have been outlined. Phenomena pertinent to the ductile fracture of metals have been reviewed as they relate to the study of rupture in the microstructural regime. Experimental observations on pure single crystals of sivler, alpha-iron, and beryllium during fracture have been reported and analyzed. The fracture mechanism can be subdivided into the sequence microvoid initiation, void growth, and void coalescence. It is proposed to distinguish between a primary and a secondary sequence. The latter is applicable to ligament fracture which constitutes the final separation. It was concluded that dislocation cell walls and other boundaries are the initiation sites for microcracks in pure metals and alloys. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1980
Accession Number
ADA082126

Entities

People

  • H. G. F. Wilsdorf

Organizations

  • University of Virginia

Tags

Communities of Interest

  • Air Platforms
  • Biomedical
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Cell Structure
  • Cellular Structures
  • Crystals
  • Electron Microscopes
  • Electron Microscopy
  • Engineering
  • Materials
  • Materials Science
  • Mechanics
  • Metallurgy
  • Microscopes
  • Microscopy
  • Military Research
  • Physics Laboratories
  • Plastic Properties
  • Point Defects
  • Stress Strain Relations

Readers

  • Materials Science (Mechanical Engineering).
  • Materials Science and Engineering.
  • Theoretical Analysis.

Technology Areas

  • Microelectronics