4.6 Article

Mechanism of dislocation promoting Al13Fe4 precipitation during friction stir-assisted incremental sheet forming in AA5052 sheet

期刊

MATERIALS LETTERS
卷 315, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.matlet.2022.131976

关键词

Aluminum alloy; Incremental sheet forming; Microstructure; Precipitation; Dislocation; Segregation

资金

  1. National Natural Science Foundation of China [52101022, U1737210]
  2. Program of Shanghai Excellent Academic Research Leadership [19XD1401900]
  3. Shaanxi Province Natural Science Foundation [2021JQ-080]

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The precipitation behavior of Al13Fe4 in AA5052 sheet during friction stir-assisted incremental sheet forming (FS-ISF) is investigated in this study. It is found that both incoherent and semi-coherent precipitates increase in size, and their content increases with the temperature caused by the high-speed rotation of the tool. Dense dislocations emerge and interact around these precipitates. Transmission electron microscopy (TEM) analysis reveals that dislocations can induce precipitation by promoting atomic segregations of Fe and Al elements. The strength of FS-ISFed AA5052 is further enhanced compared to conventional incremental sheet forming at room temperature (RT-ISF).
The precipitation behavior of Al13Fe4 in AA5052 sheet during friction stir-assisted incremental sheet forming (FS-ISF) is investigated in the present work. It is found that the sizes of both incoherent and semi-coherent precipitates enlarge, and their contents increase with the increasing temperature caused by the high-speed rotation of the tool. Dense dislocations emerge and interact around these precipitates. Transmission electron microscopy (TEM) analysis reveals that dislocations can induce precipitation through prompting atomic segregations of Fe and Al elements. The strength of FS-ISFed AA5052 is further enhanced compared with conventional incremental sheet forming at room temperature (RT-ISF).

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