Creep of CoO single crystals |
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| Authors: | A H Clauer M S Seltzer B A Wilcox |
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| Affiliation: | (1) Metal Science Group, Battelle Memorial Institute, Columbus Laboratories, 505 King Avenue, 43201 Columbus, Ohio, USA |
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| Abstract: | Cobalt monoxide single crystals having a 100] orientation were creep tested in compression over ranges of temperature, stress and oxygen pressure. The creep curves were S-shaped and only the inflection creep rate,  2, was analysed. In the range of 1000 to 1200° C, 850 to 1700 psi and 10–3 to 1 atm oxygen, 2 was given by 2=A po
2
0.45
7.1exp(– Q
c
/RT) where Q
c
=87±6 kcal/mol at 0.01 atm O
2 and 100±16 kcal/mol at 1 atm O
2. Slip occurred on two orthogonal {011}  0¯11 slip systems. The presence of subboundaries was observed by optical and transmission electron microscopy. It is suggested that the creep rate is controlled by oxygen diffusion. |
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