Metallurgical Transactions

, Volume 2, Issue 5, pp 1283–1288 | Cite as

The mechanical response of the Ni−Ni3Nb eutectic composite: Part I. Monotonic behavior

  • W. R. Hoover
  • R. W. Hertzberg
Mechanical Behavior


To understand the mechanical behavior of the Ni−Ni3Nb eutectic composite, it was necessary to determine the operative deformation and fracture mechanisms in the Ni3Nb intermetallic phase. It was found that Ni3Nb deforms primarily by twinning along {112} planes and {011} planes when tension and compression, respectively, are applied parallel to the [100] growth direction. The {112} twins were observed to serve as crack nucleation sites with cracks forming along the twin boundaries. The monotonic response of the Ni−Ni3Nb eutectic composite was investigated with tension and compression tests, metallography, and electron fractography. Room temperature tensile testing of the Ni−Ni3Nb composite revealed this material to be capable of sustaining tensile strains in excess of 11 pct. This large composite ductility was associated with extensive {112} twinning of the Ni3Nb lamellae and subsequent twin boundary cracking. When amassed in sufficient numbers in a given cross-section, these {112} twin boundary fissures initiated composite rupture. The room temperature ultimate tensile and compressive strengths of the alloy were found to be 109 and 235 ksi, respectively.


Twin Boundary Tensile Fracture Ni3Nb Nickel Matrix Eutectic Composite 
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Copyright information

© Springer-Verlag 1971

Authors and Affiliations

  • W. R. Hoover
    • 1
  • R. W. Hertzberg
    • 2
  1. 1.Sandia LaboratoriesAlbuquerque
  2. 2.Lehigh UniversityBethlehemUSA

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