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.
Highlights
As is well known, with high stacking-fault energy (SFE) and twin-boundary energy, aluminum and its alloys rarely produce stacking faults (SFs) or microtwins
The SFs and microtwins mentioned above are commonly explained by the generation of Shockley partial dislocation [8,9], while SFs caused by Frank partial dislocations are seldom investigated
In our former investigation, we discovered SFs in aluminum alloys; these were not discussed in detail [16]
Summary
With high stacking-fault energy (SFE) and twin-boundary energy, aluminum and its alloys rarely produce stacking faults (SFs) or microtwins. Some SFs led by Frank loop have been found [10,11,12], these SFs were unstable during heating or irradiation. Another effective and widely researched way of improving the performance of aluminum alloys is to produce precipitates [13,14,15]. This paper shall focus on stable SFs with Frank partial dislocations that were found, as well as their formation process. This paper shall focus on stable SFs with Frank partial dislocations that were.
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