Feasibility for Improving Ambient Temperature Toughness of MOSI2 and its Composites.

Abstract

Due to its high melting point and oxidation resistance, molybdenum disilicide (MoSi2) is a candidate for high temperature structural components. However, in order for MoSi2 to be applicable for these applications, the high temperature creep resistance and low temperature fracture toughness of the compound need to be substantially improved. In this ONR sponsored study, we are examining the effects of processing on the resulting microstructure and properties of reinforced and unreinforced MoSi2. Samples have been obtained from several laboratories with the goal of determining the effects of purity and processing. The results indicate that a finer grain size in combination with the addition of small particles, whether silica, SiC, or precipitates, contributes to the improvement in the material's low temperature fracture toughness.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1997
Accession Number
ADA326120

Entities

People

  • A. V. Newman
  • H. Herman
  • S. Sampath

Organizations

  • Stony Brook University

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Acoustic Emissions
  • Crystal Structure
  • Crystals
  • Engineered Materials
  • Grain Boundaries
  • Hot Pressing
  • Materials
  • Materials Engineering
  • Materials Science
  • Materials Testing
  • Mechanical Properties
  • Melting Point
  • Oxidation Resistance
  • Particles
  • Structural Components
  • Test Methods
  • Transition Temperature

Fields of Study

  • Materials science

Readers

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