Strengthening of NiAl Matrix Composites

Abstract

An investigation was undertaken to determine if by cryomilling NiAl and TiB2 powders ultra fine subgrain or grain size material could be obtain. If this ultra fine grain size composite were produced then it was assumed there should be a significant increase in the strength. Cryomilling did decrease the grain or subgrain size but the strength of the 20 V% TiB2/NiAl composite was the same as 20 V% TiB2 made by the XDTM process. Also, a 0 V% TiB2/NiAl composite produced from cryomilled NiAl was about the same strength as the 20 V% TiB2/NiAl composites. The above mentioned composites were made by HIPPing and extrusion. If the 0 V% TiB2/NiAl cryomilled composite is tested in the as HIPPed condition, the strength is much greater. A TEM investigation has shown that in case of extruded cryomilled composites there is a dispersion of small 10-20 nm Al203 and AIN particles. In the case of the as HIPPed cryomilled composite the Al2O3 and AIN formed a network at the grain boundaries.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1992
Accession Number
ADA256970

Entities

People

  • Richard J. Arsenault

Organizations

  • University of Maryland

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Birds
  • Composite Materials
  • Crystal Structure
  • Electron Microscopy
  • Finite Element Analysis
  • Materials
  • Materials Laboratories
  • Materials Science
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Metal Matrix Composites
  • Modulus Of Elasticity
  • Plastic Properties
  • Stress Strain Relations
  • Stresses
  • Two Dimensional

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.