Accession Number:

AD0272146

Title:

FACTORS AFFECTING THE HIGH TEMPERATURE STRENGTH OF POLYCRYSTALLINE SOLIDS

Descriptive Note:

Corporate Author:

STANFORD UNIV CALIF

Personal Author(s):

Report Date:

1961-12-01

Pagination or Media Count:

1.0

Abstract:

Quantitative analyses of the high temperature strength data on pure polycrystalline metals indicate that the following factors will promote the high temperature creep resistance a crystal structure the best structure is the diamondtype, followed by the close-packed fcc or hcp structures and lastly, the bcc structure, b high melting temperature, c high elastic modulus, d high valence state, and e fine stable grain size. Comparison of current theories of high temperature deformation with experimental data reveal that Weertmans theory of creep based on dislocation climb best describes the experimental data for creep of pure metals at high stresses and the Nabarro-Herring theory based on atomic diffusion appears applicable at low stresses. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE