Abstract
First observations of periodic markings associated with the migration of grain boundaries in a polycrystalline metal subjected to low cycle and high temperature fatigue are reported. High purity lead (99.9995%) which was further purified by reduction with H at 600/sup 0/C and then cast in low pressure H. During high temperature fatigue, markings from grain boundary migration show one-to-one correspondence with the number and pattern of cyclic loading. The distance migrated by a grain boundary in each cycle increases as the imposed frequency is decreased. Interferometry reveals a distinct and repetitive pattern across each grain boundary sliding in addition to the migration. (FS)
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