Accession Number : AD0005978


Title :   CREEP CORRELATIONS OF METALS AT ELEVATED TEMPERATURES-AND APPENDIX- SERIES NO. 22, ISSUE NO. 25


Corporate Author : CALIFORNIA UNIV BERKELEY MATERIALS RESEARCH LAB


Personal Author(s) : SHERBY, OLEG D ; ORR, RAYMOND L ; DORN, JOHN E


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/005978.pdf


Report Date : 01 Mar 1953


Pagination or Media Count : 44


Abstract : Creep and tensile data of pure metals above 0.45 times the melting temperature are correlated by using the equations epsilon = f(t e -DeltaH/RT, delta) and delta = f(epsilon sub s e DeltaH/RT) where epsilon is the creep, t is the test time, DeltaH is the creep-activation energy, R is the gas constant, T is the absolute temperature, delta is the applied stress, and epsilon s is the secondary creep rate). These parameters were applied successfully to creep and tensile data for Pt, Ni, Cu, Au, Al, Pb, Fe, and Zn as well as to solid-solution alloys. The quantity DeltaH was a constant for a given metal and was equal to the self-diffusion activation energy for a given metal. In addition, DeltaH was a periodic function of the atomic number.


Descriptors :   *ACTIVATION ENERGY , FUNCTIONS , METALS , TEMPERATURE , SECONDARY , TENSILE PROPERTIES , RATES , ALLOYS , GASES , TIME , PURITY , CREEP , DIFFUSION COEFFICIENT , EQUATIONS , ATOMIC PROPERTIES , SOLID SOLUTIONS , TEST AND EVALUATION , STRESSES


Subject Categories : Thermodynamics


Distribution Statement : APPROVED FOR PUBLIC RELEASE