Accession Number : AD0453317


Title :   WORK HARDENING OF COPPER CRYSTALS BY CYCLIC STRAINING,


Corporate Author : ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (ENGLAND)


Personal Author(s) : Wadsworth,N J ; Hutchings,J


Report Date : Aug 1964


Pagination or Media Count : 1


Abstract : Copper single crystals were strained cyclically between constant plastic strain limits. The mechanical hysteresis loops were plotted. The loop shape became constant after a few cycles while the peak stress increased for a few hundred cycles. The effect of sudden changes in temperature or in strain rate on the flow stress was observed and comparison tests were made on similar crystals strained unidirectionally. It is concluded that the frequency factor of the thermally activated process controlling the strain rate is higher in the cyclically hardened crystals. (Author)


Descriptors :   *COPPER , *METAL CRYSTALS , SINGLE CRYSTALS , HARDENING , COLD WORKING , MECHANICAL WORKING , STRAIN(MECHANICS) , HYSTERESIS , STRESSES , DEFORMATION , TEMPERATURE , PLASTIC PROPERTIES , CRYOGENICS , UNITED KINGDOM


Distribution Statement : APPROVED FOR PUBLIC RELEASE