Cyclic Deformation and Fatigue of Precipitate Hardened Single Crystals.

Abstract

A study has been made of precipitation hardened alloys because their fatigue properties can be improved by a much smaller factor than their monotonic strengths. The aim of the work has been to understand why the hardening precipitates are unstable to cyclic strain because this leads to cyclic softening in persistent slip bands (PSB's), strain localization and, therefore, fatigue failure at disappointingly low applied stresses. Both crack nucleation and propagation mechanisms are affected by such precipitate instability and PSB's.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1982
Accession Number
ADA121001

Entities

People

  • Campbell Laird

Organizations

  • University of Pennsylvania

Tags

Communities of Interest

  • Counter IED
  • Human Systems

DTIC Thesaurus Topics

  • Alloys
  • Aluminum Alloys
  • Band Structures
  • Cracks
  • Crystal Structure
  • Crystals
  • Energy Bands
  • Grain Size
  • Hardening
  • Materials
  • Materials Science
  • Polycrystals
  • Precipitation
  • Single Crystals
  • Softening
  • Stress Strain Relations
  • Students

Readers

  • Materials Science (Mechanical Engineering).
  • Powder metallurgy of Titanium alloys.