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Crystals 2017, 7(12), 375; doi:10.3390/cryst7120375

Stable Stacking Faults Bounded by Frank Partial Dislocations in Al7075 Formed through Precipitate and Dislocation Interactions

1,2,3
,
1,2,3,* , 1,2,3, 1,2,3
,
1,2,3
,
1,2,3
and
1,2,3
1
Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
2
The Collaborative Innovation Center for Advanced Aero-Engine (CICAAE), Beijing University of Aeronautics and Astronautics, Beijing 100191, China
3
Beijing Key Laboratory of Advanced Nuclear Materials and Physics, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
*
Author to whom correspondence should be addressed.
Academic Editor: Peter Lagerlof
Received: 9 November 2017 / Revised: 10 December 2017 / Accepted: 11 December 2017 / Published: 13 December 2017
(This article belongs to the Special Issue Crystal Dislocations: Their Impact on Physical Properties of Crystals)
View Full-Text   |   Download PDF [5391 KB, uploaded 13 December 2017]   |  

Abstract

Through high-resolution electron microscopy, stacking faults (SFs) due to Frank partial dislocations were found in an aluminum alloy following deformation with low strain and strain rate, while also remaining stable during artificial aging. Extrinsic stacking faults were found surrounded by dislocation areas and precipitates. An intrinsic stacking fault was found between two Guinier-Preston II (GP II) zones when the distance of the two GP II zones was 2 nm. Defects (precipitates and dislocations) are considered to have an influence on the formation of the SFs, as their appearance may cause local strain and promote the gathering of vacancies to lower the energy. View Full-Text
Keywords: stacking faults; frank partial dislocation; precipitates; vacancies stacking faults; frank partial dislocation; precipitates; vacancies
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Li, S.; Luo, H.; Wang, H.; Xu, P.; Luo, J.; Liu, C.; Zhang, T. Stable Stacking Faults Bounded by Frank Partial Dislocations in Al7075 Formed through Precipitate and Dislocation Interactions. Crystals 2017, 7, 375.

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