The present work discusses conditions of comparable creep behaviour of a me
tal (copper) and an intermetallic compound (Ti52Al). It compares three "sim
ilar" creep curves obtained at the same homologous temperature and showing
the same minimum creep rate. In both materials, creep starts with an initia
l stage during which the creep rate decreases to its minimum. In the stage
after the minimum, a remarkable difference in behaviour appears-a rapid ter
tiary stage in copper and a stage of a slowly increasing creep rate in the
intermetallic alloy. Corresponding qualitative and quantitative differences
in the dislocation structure and substructure resulting from pre-fracture
creep were investigated by means of transmission electron microscopy. (C) 2
001 Elsevier Science Ltd. All rights reserved.