Item Details

Tensile Properties to 650 ̊C and Deformation Structures in a Precipitation-Strengthened Titanium-Aluminum Alloy

by Madan G. Mendiratta
Format
Book; Government Document; Online; EBook
Published
Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1973.
Language
English
Series
NASA Technical Note
Summary
Appreciable strength levels were retained to 650 C in a Ti-10Al-1Si alloy aged in the (alpha alpha sub 2) phase field to yield optimum room temperature strength and ductility. The aging treatment precipitated a uniform distribution of alpha sub 2-particles such that, at room temperature, dislocations bypassed instead of shearing the particles at low strains. Specimens fractured at room temperature exhibited fine uniform dimples even for those aging conditions that imparted no macroscopic ductility. The main crack appeared to propagate through the planar slip bands that had cut through the alpha sub 2-particles. A two-step aging process produced a higher volume fraction of bimodally distributed alpha sub 2-particles that led to higher strength levels at elevated temperatures. Both for the single size and the bimodal alpha sub 2-particle distributions, elevated-temperature deformation structures consisted mainly of planar slip bands that sheared through the alpha sub 2-particles.
Description
23 p. : ill. ; 27 cm.
Mode of access: Internet.
Notes
  • Prepared at Lewis Research Center.
  • Cover title.
  • Bibliography: p. 22-23.
Series Statement
NASA technical note ; NASA TN D-7325
Logo for Copyright Not EvaluatedCopyright Not Evaluated
Technical Details

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    a| Tensile properties to 650 ̊C and deformation structures in a precipitation-strengthened titanium-aluminum alloy c| by Madan G. Mendiratta.
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    a| Washington, D.C. : b| National Aeronautics and Space Administration ; a| [Springfield, Va. : b| For sale by the National Technical Information Service], c| 1973.
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    a| 23 p. : b| ill. ; c| 27 cm.
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    a| NASA technical note ; v| NASA TN D-7325
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    a| Prepared at Lewis Research Center.
    500
      
      
    a| Cover title.
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    a| Bibliography: p. 22-23.
    520
      
      
    a| Appreciable strength levels were retained to 650 C in a Ti-10Al-1Si alloy aged in the (alpha alpha sub 2) phase field to yield optimum room temperature strength and ductility. The aging treatment precipitated a uniform distribution of alpha sub 2-particles such that, at room temperature, dislocations bypassed instead of shearing the particles at low strains. Specimens fractured at room temperature exhibited fine uniform dimples even for those aging conditions that imparted no macroscopic ductility. The main crack appeared to propagate through the planar slip bands that had cut through the alpha sub 2-particles. A two-step aging process produced a higher volume fraction of bimodally distributed alpha sub 2-particles that led to higher strength levels at elevated temperatures. Both for the single size and the bimodal alpha sub 2-particle distributions, elevated-temperature deformation structures consisted mainly of planar slip bands that sheared through the alpha sub 2-particles.
    538
      
      
    a| Mode of access: Internet.
    650
      
    0
    a| High temperatures.
    650
      
    0
    a| Strength of materials.
    650
      
    0
    a| Deformations (Mechanics)
    650
      
    0
    a| Precipitation hardening.
    650
      
    0
    a| Titanium alloys x| Ductility.
    650
      
    0
    a| Titanium alloys x| Testing.
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    a| United States. b| National Aeronautics and Space Administration.
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    a| Lewis Research Center.
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