期刊
PHILOSOPHICAL MAGAZINE LETTERS
卷 89, 期 8, 页码 517-526出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09500830903127518
关键词
Fe; dislocation dynamics; electron microscopy
类别
资金
- European Fusion Development Agreement
In situ transmission electron microscopy straining experiments were carried out in pure Fe to investigate the origin of the discontinuity observed at 250 K in the temperature variation of the deformation activation parameters. The results show that the motion of screw dislocations is steady at 300 K, in agreement with a kink-pair mechanism, but jerky at 110 K. This change has been attributed to a transition from a kink-pair mechanism to a locking-unlocking mechanism, similar to that observed previously in Ti.
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