CONTROVERSY ABOUT THE ORIGIN OF THE GRAIN-BOUNDARY INTERNAL-FRICTION PEAK AND ITS CLARIFICATION

In the seventies some scientific workers from France and Italy suggest ed that the grain boundary internal friction peak (named the K (e) ove r cap peak in the literature) widely accepted as a grain boundary proc ess, is originated from the motion of lattice dislocations. Since this problem is one of fundamental importance, this controversy has drawn much international attention. Started from 1982, the Hefei research gr oup made a critical analysis of the large amount of literature concern ing this problem and,performed a series of crucial experiments to clar ify the controversy. It is concluded that the irrelevant evidence sugg ested by the controverters comes from the farfetched interpretation an d the mis-identification of the internal friction peaks appeared under various experimental conditions and different states of the specimens .