Void Initiation Preceding Ductile Fracture in Polycrystalline Titanium.

Abstract

The objective of this research was determination of primary void initiation sites preceding void growth in the process of deformation leading to ductile fracture in polycrystalline C.P. titanium. Stereo-photogrammetry was employed to evaluate SEM fracture surfaces. Two distinct regimes of void initiation were found to operate in: (i) specimens with grain sizes up to 50 micron void initiation occurring predominately at grain boundary triple points; (ii) larger grain sized material. Here, additional void sites were due to twinning and glide band intersections and grain boundaries and grain boundary ledges themselves. Quantitative topographical information was the basis for constructing fracture surface profiles which permitted the determination of time sequence of void initiation.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1985
Accession Number
ADA161821

Entities

People

  • Heinz G. F. Wilsdorf
  • Marjorie A. Erickson

Organizations

  • University of Virginia

Tags

Communities of Interest

  • Air Platforms
  • Biomedical
  • Space

DTIC Thesaurus Topics

  • Applied Mathematics
  • Boundaries
  • Business Administration
  • Engineering
  • Geometry
  • Grain Boundaries
  • Grain Size
  • Heat Treatment
  • Materials
  • Materials Science
  • Mathematics
  • Mechanical Properties
  • Military Research
  • Photogrammetry
  • Polycrystals
  • Stress Concentration
  • Stresses

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Reinforced Composite Materials