CHANGES OF GRAIN BOUNDARY INTERNAL FRICTION PEAK OF PURE COPPER IN THE COURSE OF CONSTANT RATE TENSILE DEFORMATION
恒速拉伸过程中纯 Cu 晶界内耗峰的变化

The changes of grain boundary internal friction peak and the correspondingmodulus relaxation of pure copper have been investigated in the couse of constant rate ten-sile deformation at different temperatures.The following four relaxation parameters:(a)the peak temperature,(b)the peak height,(c)the activation energy,and(d)the modulus re-laxation strength are investigated.Experimental results show that the strength of grainboundaries changes during deformation,and the extent of strengthening is closely corre-lated to the type of fracture.The present work supports and extends the conclusions of ourprevious works on the process of creep fracture.