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  • METALLIC MATERIALS  (4)
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  • 1
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    Unknown
    The effects of interstitial content and annealing on the flow and fracture behavior on polycrystalline beta-NiAl (1994)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The strain behavior of three polycrystalline NiAl alloys has been investigated at temperatures between 300 and 1200 K. Yield stress plateaus, yield stress transients upon a ten-fold increase in strain rate, work hardening peaks, and dips in the strain rate sensitivity (SRS) have been observed between 700 and 800 K. These observations are indicative of dynamic strain aging (DSA) and are discussed in terms of conventional strain aging theories.
    Keywords: METALLIC MATERIALS
    Type: NASA-CR-200037 , NAS 1.26:200037 , NIPS-96-07285
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Constitution of pseudobinary hypoeutectic beta-NiAl + alpha-V alloys (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The formation of pseudobinary eutectics between NiAl (beta) and V (alpha) at high temperatures was investigated as a possible way of improving the ductility and toughness of the alloy. It is found that a pseudobinary eutectic, characterized by a large beta+alpha field, is formed in the Ni-Al-V ternary system below about 1370 C. The high-temperature solubility of V in beta is about 14 percent, decreasing markedly with decreasing temperature and increasing Al content above 50 at. pct Al. The pseudobinary hypoeutectic exibits crack resistance under indentation loading.
    Keywords: METALLIC MATERIALS
    Type: Scripta Metallurgica et Materialia (ISSN 0956-716X); 25; 1827-183
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A simplified method for determining the number of independent slip systems in crystals (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A novel method for determining the number of independent slip systems for any family or a combination of families of slip systems is proposed, which is more direct than previous approaches. This technique makes it possible to easily determine, from the known operative slip systems, if the material is slip-system-deficient. The method also makes it possible to determine if twinning may contribute additional deformation modes.
    Keywords: METALLIC MATERIALS
    Type: Scripta Metallurgica et Materialia (ISSN 0956-716X); 25; 2395-239
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The effects of alloy purity on the mechanical behavior of soft oriented NiAl single crystals (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: Preliminary results of the effects of alloy purity on the mechanical properties of NiAl single crystals are presented. Two stoichiometric NiAl single crystals with different impurity contents were studied. It is concluded that reductions in the interstitial and substitutional levels cause reduced yield strengths in NiAl. Heat treatment also results in reduced yield and flow stresses in both CP-NiAl and Hp-NiAl which are considered to be due to a reduction in the concentration of thermal vacancies due to vacancy coalescence during heat treatment.
    Keywords: METALLIC MATERIALS
    Type: Scripta Metallurgica et Materialia (ISSN 0956-716X); 29; 8; p. 1113-1118.
    Format: text
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    NASA TECHNICAL REPORTS
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