Resistance of Diffusion-Bonded Electroless Nickel-Plated Ti-5Al-2.5Sn Alloy to Hot Salt Stress Corrosion Cracking

Abstract

Bent-beam, constant deflection experiments at a temperature of 900 F for time durations up to 1000 hours indicated that diffusion-bonded (950 F or 1150 F in vacuum) electroless nickel plate was affected by hot salt stress corrosion (HSSC). However, the protective plate demonstrated potential for reducing the susceptibility of the Ti-5Al-2.5Sn titanium alloy substrate to HSSC cracking. Mechanically induced surface defects (indentations, scratches) in the surface of the plate did not significantly alter the patterns of corrosion attack. Continued in-house efforts to establish failure mechanisms and to optimize plating processes are contingent upon results from further tests to determine erosion and fatigue behavior of these materials at elevated temperature.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1975
Accession Number
ADA020940

Entities

People

  • Anthony K. Wong
  • Joseph L. Morrossi
  • Milton Levy

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • C4I

DTIC Thesaurus Topics

  • Aircrafts
  • Chemical Reactions
  • Cracks
  • Crystal Structure
  • Failure Mode And Effect Analysis
  • Gas Turbines
  • Materials
  • Mechanical Properties
  • Mechanics
  • Resistance
  • Stress Corrosion
  • Stress Corrosion Cracking
  • Tensile Properties
  • Tensile Strength
  • Tensile Stress
  • Titanium Alloys
  • Turbines

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Powder metallurgy of Titanium alloys.
  • Surface Engineering/Surface Coating Technology.