Strengthening Mechanisms, Creep and Fatigue Processes in Dispersion Hardened Niobium Alloy

Abstract

The creep and fatigue properties of pure Nb and Nb-l%Zr alloy were investigated. A model was developed based on the migration of subgrain boundary that can explain the anomalous primary creep transients found in Nb-l%Zr alloy, due to coarsening of subgrain structure. TEM investigations confirmed that such subgrain coarsening occurs during primary creep of Nb-l%Zr. Baseline low cycle fatigue studies of Nb and Nb-l%Zr were completed. Cyclic hardening is observed and there is a microplastic plateau in Nb. The Nb-1%Zr is stronger in cyclic deformation than Nb, with little influence of strain rate. The deformation in the alloy at both high and low strain rates is controlled by the interaction between gliding edge dislocation and solute atoms. Creep, fatigue, niobium alloy, dislocation mechanisms.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1992
Accession Number
ADA250282

Entities

People

  • Amiya K. Mukherjee
  • J.C. Gibeling

Organizations

  • University of California, Davis

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Aluminum Alloys
  • Creep
  • Creep Tests
  • Crystal Structure
  • Fatigue Tests (Mechanics)
  • Heat Treatment
  • Low Temperature
  • Materials
  • Materials Engineering
  • Materials Science
  • Materials Testing
  • Mechanics
  • Microscopy
  • Modulus Of Elasticity
  • Solid Solutions
  • Stress Strain Relations
  • Test Methods

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Powder metallurgy of Titanium alloys.