Accession Number : AD0615561

Title :   ELASTIC AND PLASTIC PROPERTIES OF CRYSTALLINE SOLIDS AT ELEVATED TEMPERATURE.

Descriptive Note : Interim rept. for Oct 59-Sep 64,

Corporate Author : STANFORD UNIV CALIF

Personal Author(s) : Lytton,Jack L. ; Hren,John A. ; Kamber,Kenneth T. ; Ardell,Alan J. ; Barrett,Craig R.

Report Date : JAN 1965

Pagination or Media Count : 42

Abstract : It was shown that the strength of pure polycrystalline metals at elevated temperature is controlled primarily by the rate of atomic mobility and the elastic modulus. The apparent activation energy for creep is shown to be greater than that for self-diffusion. If appropriate corrections are made for the change of elastic modulus with temperature, then the activation energy for creep is equal to that for self-diffusion. As a result of this investigation, new creep and stress-rupture parameters are proposed. Ferromagnetism or order can play an important role in increasing the high temperature strength of crystalline solids. The elastic and plastic properties of ferromagnetic Fe, Co, Ni and ordered FeCo, Fe3Al and CuZn were evaluated. The elastic and plastic properties of polycrystalline copper were studied in the temperature range from 400 to 950C. The types of substructure developed during high temperature creep of highly textured polycrystalline Fe - 3% Si sheet were examined by electroetching of dislocation sites.

Descriptors :   (*FERROMAGNETIC MATERIALS, CREEP), IRON, COBALT, NICKEL, IRON ALLOYS, COBALT ALLOYS, ALUMINUM ALLOYS, COPPER ALLOYS, ZINC ALLOYS, PLASTIC PROPERTIES, ELASTIC PROPERTIES, GRAIN BOUNDARIES, CRYSTAL SUBSTRUCTURE, TENSILE PROPERTIES, DIFFUSION, STRESSES, HIGH TEMPERATURE

Distribution Statement : APPROVED FOR PUBLIC RELEASE