Creep of (Mg, Fe)O single crystals

J. Wolfenstine, D. L. Kohlstedt

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The creep behaviour of (Mg, Fe)O single crystals compressed along 〈1 0 0〉 has been investigated over the temperature range 1300 to 1500° C, at stresses between 20 and 70 MPa, for oxygen partial pressures between 10 -4 and 10 2 Pa, and with iron concentrations between 70 and 11 900 p.p.m. Under these conditions, the dependence of the steady-state strain rate on stress, temperature, oxygen partial pressure, and iron concentration can be summarized by the flow law, {Mathematical expression}exp (-445 kJ mol -1 /RT. These results suggest that the steadystate strain rate is controlled by dislocation climb with a jog velocity which is limited by lattice diffusion of oxygen by a vacancy pair mechanism. The activation energy for creep, 445 kJ mol -1 is larger than that reported for self-diffusion of oxygen, 330 kJ mol -1 , because the formation energy for jogs is relatively large, 115 kJ mol -1 .

Original languageEnglish (US)
Pages (from-to)3550-3557
Number of pages8
JournalJournal of Materials Science
Issue number10
StatePublished - Oct 1 1988


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