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J Microsc. 2016 Apr;262(1):123-7. doi: 10.1111/jmi.12352. Epub 2015 Nov 24.

Phase transformation of Cu-rich precipitates from 9R to 3R variant via ledges mechanism in ferritic steel containing copper.

Author information

1
School of Materials Engineering, Shanghai University of Engineering Science, Shanghai, People's Republic of China.
2
Institute of Materials, Shanghai University, Shanghai, People's Republic of China.

Abstract

Precipitates and solute enrich in aged ferritic steel containing copper were examined using high-resolution electron microscopy, high-angle annular dark-field scanning transmission electron microscopy and energy-dispersive X-ray spectroscopy. Two ledges with one-atom and two-atom layers height in the 9R/3R interface were observed. The enrichment of copper into two successive closed-packed planes with an interval of Fe-rich close-packed plane was detected. The passage of the Shockley partial, or the shearing, changes the stacking sequence of closed-packed planes. Finally, 9R Cu variant transformed into 3R Cu variant.

KEYWORDS:

3R structure; 9R structure; HRTEM; STEM; precipitation

PMID:
26599818
DOI:
10.1111/jmi.12352
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