Fundamental Understanding of the Intrinsic Ductility in Nickel-Base L1 sub 2 Type Alloys

Abstract

A basic approach for understanding the ductility behavior of intermetallics through studies of mechanical properties and dislocation characteristics of single crystals was applied to a nickel-base Ll2 phase compound. Large single crystals of binary and tantalum-modified Ni3Al alloys with various stoichiometry were produced for tensile testing at 293 to 1144K along four major orientations: (001), (011), (111) and (123). For the binary alloys the tensile ductility generally decreases with temperature for all orientations and reaches a minimum at about 1000K for the nickel-rich (hypostoichiometric) alloy A1240. For a given temperature the ductility decreases in the order (110), (123), (001) and (111) in A1240. The ductility of the stoichiometric and hypostoichiometric binary alloys is lower and shows a more complex temperature and orientation dependence than A1240. Keywords: Nickel aluminide, Single crystals, Ductility.

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Document Details

Document Type
Technical Report
Publication Date
Jun 30, 1988
Accession Number
ADA197605

Entities

People

  • C. C. Law
  • D. W. Shah
  • Jian Lin

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Alloys
  • Binary Alloys
  • Chemistry
  • Crystal Lattices
  • Crystal Structure
  • Crystals
  • Ductility
  • High Temperature
  • Mechanical Properties
  • Orientation (Direction)
  • Single Crystals
  • Stress Strain Relations
  • Tensile Strain
  • Tensile Strength
  • Tensile Stress
  • Tensile Testing
  • Transition Metals

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.