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Annealing of cold worked hypostoichiometric Ni/sub 3/Al alloys using positron lifetime spectroscopy

Conference ·
OSTI ID:6906182
Hypostoichiometric Ni/sub 3/Al alloys of composition 76.2 Ni:23.8 Al containing impurity levels of boron and hafnium were either cold rolled or pressed. Rolled and pressed samples were deformed by 20% and 10% thickness reductions, respectively. Samples were annealed isochronally at approximately 50/sup 0/C intervals up to 1050/sup 0/C. Two major annealing stages were apparent in all three alloys studied. These could be attributed to vacancy migration to sinks and annealing of dislocations and(or) recrystallization. The onset of vacancy migration occurred at approximately 200/sup 0/C in all three alloys. Annealing of dislocations started at 650/sup 0/C to 700/sup 0/C and was complete at 1000/sup 0/C for alloys which contained boron and or hafnium impurities. In the pure alloy the onset of dislocation annealing occurred at 800/sup 0/C and was incomplete at the highest (1050/sup 0/C) annealing temperatures reached.
Research Organization:
Brookhaven National Lab., Upton, NY (USA)
DOE Contract Number:
AC02-76CH00016
OSTI ID:
6906182
Report Number(s):
BNL-39052; CONF-861207-55; ON: DE87005248
Country of Publication:
United States
Language:
English