Characterization of the effects of different tempers and aging temperatures on the precipitation behavior of Al-Mg (5.25at.%)-Mn alloys

Yi, Gaosong; Littrell, Kenneth C.; Poplawsky, Jonathan D.; Cullen, David A.; Sundberg, Erik; Free, Michael L.

doi:10.1016/j.matdes.2017.01.021

Title: Characterization of the effects of different tempers and aging temperatures on the precipitation behavior of Al-Mg (5.25at.%)-Mn alloys

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Abstract

The effects of different tempers (H131 and H116) and different aging temperatures (50 and 70 °C) on the precipitation behavior of Al-Mg (5.25 at.%)-Mn (Al 5083) alloys aged for a long time (41 and 30 months) were investigated using electron backscatter diffraction(EBSD), scanning transmission electron microscopy(STEM), energy-dispersive X-ray spectroscopy(EDS), atom probe tomography (APT), and small angle neutron scattering (SANS). GP zones and β" phases were found in Al 5083 H116 aged at 50 °C for 24 months using APT. EDS and SANS results revealed that a phase transformation process from GP zones to β'/β phases occurred for precipitates formed in both Al 5083 H131 and H116 aged at 70 °C. The effective diffusion coefficient of Mg in Al 5083 H131 is 1.8 times of that in Al 5083 H116 aged at 70 °C. The precipitation process in Al 5083 H116 aged at 50 °C is much slower than that in the sample aged at 70 °C. The coarsening process was identified in Al 5083 H131 and H116 aged at 70 °C for > 9 months.

Authors:

Yi, Gaosong ^[1]; Littrell, Kenneth C. ^[2]; Poplawsky, Jonathan D. ^[3]; Cullen, David A. ^[4]; Sundberg, Erik ^[1]; Free, Michael L. ^[1]

Univ. of Utah, Salt Lake City, UT (United States). Dept. of Metallurgical Engineering
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical and Engineering Materials Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division

Publication Date:: Wed Jan 11 00:00:00 EST 2017

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1341573

Alternate Identifier(s):: OSTI ID: 1474500

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Materials & Design

Additional Journal Information:: Journal Volume: 118; Journal Issue: C; Journal ID: ISSN 0264-1275

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; aluminum alloys; precipitation; atom-probe tomography; small angle neutron scattering

Citation Formats


                    Yi, Gaosong, Littrell, Kenneth C., Poplawsky, Jonathan D., Cullen, David A., Sundberg, Erik, and Free, Michael L. Characterization of the effects of different tempers and aging temperatures on the precipitation behavior of Al-Mg (5.25at.%)-Mn alloys.  United States: N. p., 2017. 
Web.  doi:10.1016/j.matdes.2017.01.021.

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                    Yi, Gaosong, Littrell, Kenneth C., Poplawsky, Jonathan D., Cullen, David A., Sundberg, Erik, & Free, Michael L. Characterization of the effects of different tempers and aging temperatures on the precipitation behavior of Al-Mg (5.25at.%)-Mn alloys.  United States.  https://doi.org/10.1016/j.matdes.2017.01.021

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                    Yi, Gaosong, Littrell, Kenneth C., Poplawsky, Jonathan D., Cullen, David A., Sundberg, Erik, and Free, Michael L. Wed .  
"Characterization of the effects of different tempers and aging temperatures on the precipitation behavior of Al-Mg (5.25at.%)-Mn alloys".  United States.  https://doi.org/10.1016/j.matdes.2017.01.021.  https://www.osti.gov/servlets/purl/1341573.

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@article{osti_1341573,

  title        = {Characterization of the effects of different tempers and aging temperatures on the precipitation behavior of Al-Mg (5.25at.%)-Mn alloys},

  author       = {Yi, Gaosong and Littrell, Kenneth C. and Poplawsky, Jonathan D. and Cullen, David A. and Sundberg, Erik and Free, Michael L.},

  abstractNote = {The effects of different tempers (H131 and H116) and different aging temperatures (50 and 70 °C) on the precipitation behavior of Al-Mg (5.25 at.%)-Mn (Al 5083) alloys aged for a long time (41 and 30 months) were investigated using electron backscatter diffraction(EBSD), scanning transmission electron microscopy(STEM), energy-dispersive X-ray spectroscopy(EDS), atom probe tomography (APT), and small angle neutron scattering (SANS). GP zones and β" phases were found in Al 5083 H116 aged at 50 °C for 24 months using APT. EDS and SANS results revealed that a phase transformation process from GP zones to β'/β phases occurred for precipitates formed in both Al 5083 H131 and H116 aged at 70 °C. The effective diffusion coefficient of Mg in Al 5083 H131 is 1.8 times of that in Al 5083 H116 aged at 70 °C. The precipitation process in Al 5083 H116 aged at 50 °C is much slower than that in the sample aged at 70 °C. The coarsening process was identified in Al 5083 H131 and H116 aged at 70 °C for > 9 months.},

  doi          = {10.1016/j.matdes.2017.01.021},

  journal      = {Materials & Design},

  number       = C,

  volume       = 118,

  place        = {United States},

  year         = {Wed Jan 11 00:00:00 EST 2017},

  month        = {Wed Jan 11 00:00:00 EST 2017}

}

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