Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 32, Issue 2, Pages 436-447Publisher
ELSEVIER
DOI: 10.1016/S1003-6326(22)65805-9
Keywords
Al-Mg-Si-Cu alloy; pre-straining; Cu segregation; precipitate; HAADF-STEM
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Funding
- Natural Science Foundation of Jiangsu Province, China [BK20201035]
- Talent Research Fund in Nanjing Institute of Technology, China [YKJ201957]
- National Natural Science Foundation of China [51871035, 52001159]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [20KJB430016, 20KJB430012]
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The effect of pre-straining on the structure and formation mechanism of precipitates in an Al-Mg-Si-Cu alloy was investigated using high-resolution HAADF-STEM. Elongated and string-like precipitates formed along the dislocations in the pre-strained alloy, exhibiting non-periodic atomic arrangement, Cu segregation at the precipitate/alpha(Al) interface, and different orientations. Four different formation mechanisms were proposed, leading to different atomic structures and morphologies of the precipitates.
The effect of pre-straining on the structure and formation mechanism of precipitates in an Al-Mg-Si-Cu alloy was systematically investigated by atomic resolution high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). Elongated and string-like precipitates are formed along the dislocations in the pre-strained Al-Mg-Si-Cu alloy. The precipitates formed along the dislocations exhibit three features: non-periodic atomic arrangement within the precipitate; Cu segregation occurring at the precipitate/alpha(Al) interface; different orientations presented in one individual precipitate. Four different formation mechanisms of these heterogeneous precipitates were proposed as follows: elongated precipitates are formed independently in the dislocation; string-like precipitates are formed directly along the dislocations; different precipitates encounter to form string-like precipitates; precipitates are connected by other phases or solute enrichment regions. These different formation mechanisms are responsible for forming different atomic structures and morphologies of precipitates.
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