Abstract
Pre-existing particles formed in Al 5083 alloys (H131 and H116) have been investigated using scanning transmission electron microscopy(STEM), energy-dispersive X-ray spectroscopy(EDS), atom probe tomography (APT), and small angle neutron scattering (SANS). Three types of pre-existing particles, Al6Mn, Mg2Si, and α-Al(Mn,Fe)Si, were observed in Al 5083 alloys, and their relative fraction was obtained from EDS results. The average size, number density, and interfacial area of pre-existing particle were calculated using STEM and SANS results. In addition, an extra layer rich in Mg and Si was found on a pre-existing Mg2Si particle, and an Al6Mn layer was identified on an α-Al(Mn,Fe)Si particle. Thermodynamic calculations were also applied to investigate the possible pre-existing particles formed in the alloys, which can be used to explain the extra layers formed on Mg2Si and α-Al(Mn,Fe)Si particles.
Original language | English |
---|---|
Pages (from-to) | 461-469 |
Number of pages | 9 |
Journal | Journal of Alloys and Compounds |
Volume | 740 |
DOIs | |
State | Published - Apr 5 2018 |
Funding
The work is supported by Office of Naval Research , Award Number: N000141210507 . APT and part of STEM-EDS was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. This work utilizes the Oak Ridge National Laboratory's High Flux Isotope Reactor, which is sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences , U.S. Department of Energy. Partial support from JPK Instruments for the Nanowizard 3a UTLRA AFM used in the imaging is gratefully acknowledged. This work made use of University of Utah USTAR shared facilities support, in part, by the MRSEC Program of NSF under Award No. DMR-1121252 . The work is supported by Office of Naval Research, Award Number: N000141210507. APT and part of STEM-EDS was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. This work utilizes the Oak Ridge National Laboratory's High Flux Isotope Reactor, which is sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. Partial support from JPK Instruments for the Nanowizard 3a UTLRA AFM used in the imaging is gratefully acknowledged. This work made use of University of Utah USTAR shared facilities support, in part, by the MRSEC Program of NSF under Award No. DMR-1121252.
Keywords
- APT
- Al 5083 alloys
- CALPHAD
- Pre-existing particle
- SANS
- STEM