Accession Number : AD0447829


Title :   (NO TITLE).


Descriptive Note : Progress rept. no. 15, 16 Oct 63-15 Apr 64.


Corporate Author : CARNEGIE INST OF TECH PITTSBURGH PA METALS RESEARCH LAB


Report Date : 15 Jun 1964


Pagination or Media Count : 2


Abstract : The deformation characteristics of high purity lead and gold single crystals were studies over the temperature range of 77 K to 300 K by incremental loading creep tests in shear and strain-rate-change tests in tension. The data for lead indicate that above 128 K the change of the structure with strain is temperature dependent and at 148 K a change occurs in the prominent mechanism of the deformation kinetics. The data for gold show that a single thermally activated process is rate controlling over this temperature raynge from O shear strain and well into Stage II deformation where the tests were terminated. Calculations are presented on the interaction a dn intersection of dislocations considered in terms of the macroscopic aspects of crystalline flow in the f.c.c. lattice. (Author)


Descriptors :   *CRYSTAL STRUCTURE , DEFORMATION , LOW TEMPERATURE , SINGLE CRYSTALS , GOLD , LEAD(METAL) , CREEP , SHEAR STRESSES , IRON , TENSILE PROPERTIES , ZONE MELTING , IMPURITIES , ELECTRICAL RESISTANCE , COPPER , STRAIN(MECHANICS) , CRYSTAL GROWTH , DUCTILITY


Distribution Statement : APPROVED FOR PUBLIC RELEASE