Processing and Properties of Airframe Materials.

Abstract

This report describes the results of a three-year research program to study the relationship between microstructure and processing conditions and the effects of processing conditiins on the performance of structural airframe materials. Part I of the program was an examination of the influence of beta processing methods on the interaction of fatigue cracks with microstructural elements. These beta-phase processing methods were chosen to provide variations in beta-phase volume fraction and continuity, alpha plate size, and alpha colony size in plate and forging material. The microstructures of the beta-processed materials were quantitatively characterized using scanning electron microscopy (SEM) and scanning transmission electron microscopy (STEM). Linear regression analyses revealed that beta phase volume fraction was most influential and colony size least influential on fatigue crack growth rates. Keywords: Metal processing, Titanium, Aluminum, Fatigue, Superplasticity, Void closure power consolidation, Cavitation, Dynamic recrystallization, Dynamic grain growth.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1987
Accession Number
ADA182159

Entities

People

  • Ashish Ghosh
  • C. G. Rhodes
  • J. A. Wert
  • J. C. Chestnutt

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Human Systems
  • Space

DTIC Thesaurus Topics

  • Aircrafts
  • Aluminum Alloys
  • Composite Materials
  • Creep
  • Crystal Structure
  • Electron Microscopy
  • Geometry
  • Hot Pressing
  • Materials
  • Measurement
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Numerical Analysis
  • Powder Metals
  • Regression Analysis
  • Stress Strain Relations

Fields of Study

  • Materials science

Readers

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

Technology Areas

  • Microelectronics