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  • 11
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    Unknown
    Creep behaviour of Cu-30 percent Zn at intermediate temperatures (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The present, intermediate-temperature (573-823 K) range investigation of creep properties for single-phase Cu-30 percent Zn alpha-brass observed inverse, linear, and sigmoidal primary-creep transients above 573 K under stresses that yield minimum creep rates in the 10 to the -7th to 2 x 10 to the -4th range; normal primary creep occurred in all other conditions. In conjunction with a review of the pertinent literature, a detailed analysis of these data suggests that no clearly defined, classes M-to-A-to-M transition exists in this alloy notwithstanding the presence of both classes' characteristics under nominally similar stresses and temperatures.
    Keywords: METALLIC MATERIALS
    Type: Journal of Materials Science (ISSN 0022-2461); 26; 3533-354
    Format: text
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    NASA TECHNICAL REPORTS
  • 12
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    Unknown
    Creep behavior of copper at intermediate temperatures. II - Surface microstructural observations. III - A comparison with theory (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Three different types of microstructural slip features are noted to occur during the creep of Cu at 0.46-0.72 of absolute melting point. While single slip is associated with higher temperatures and lower stresses, complex wavy slip features are observed at higher temperatures and higher stresses as well as with increasing strains: suggesting the importance of cross-slip mechanisms. At lower temperatures and higher stresses the multiple-slip morphologies observed indicate that cross-slip mechanisms may control the creep of polycrystalline Cu only over a limited stress and temperature range. A phenomenological model is proposed which assumes that (1) cell boundaries within subgrains act as both sources of, and obstacles to, gliding dislocations, and (2) dislocation annihilation occurs at the cell boundaries by climb and cross-slip.
    Keywords: METALLIC MATERIALS
    Type: Acta Metallurgica et Materialia (ISSN 0956-7151); 39; 1817-183
    Format: text
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    NASA TECHNICAL REPORTS
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