期刊
PHILOSOPHICAL MAGAZINE
卷 89, 期 10, 页码 853-868出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786430902791730
关键词
aluminium; point-defect pinning; di-vacancy kinetics; jog dragging; dislocation atmosphere
类别
资金
- Natural Science and Engineering Research Council (Canada)
- General Motors Canada Ltd
The role of point defect production during deformation was examined by sealing the vacancy sinks in the grain boundaries with solutes to magnify its effect upon instantaneous strain-rate changes. AA1100 aluminium sheets were thermal-mechanically treated to result in a grain size of about 25 m and in grain boundaries that were not capable of acting as efficient vacancy sinks. Tensile tests at various temperatures ranging from 78 to 300 K showed that above 195 K, the pinning effect could be quantitatively analysed. A rate equation analysis for mono- and di-vacancy recovery was adopted to perform fits to the deduced change in flow stress with time after strain-rate change from which apparent activation energies were derived. This examination indicates that the migrating species are predominantly di-vacancies. It is concluded that point-defect atmospheres have the capacity to glide in unison with mobile dislocations and hence are sensitive to the magnitude of the strain rate and temperature.
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