γ2-Al8Mn5 intermetallic particles are generally present in commercial Mg-Al-Zn alloys. The present study is concerned with the effect of solutionizing on the morphology and phase stability of the γ2-Al8Mn5 particles in an as-cast AZ91 alloy. Analysis using energy dispersive spectroscopy (EDS) and electron back scattered diffraction (EBSD) in a scanning electron microscope (SEM), transmission electron microscopy (TEM) and atom probe tomography (APT) suggests that solutionizing resulted in uphill diffusion of Al from the α-Mg matrix resulting in the phase transformation of γ2-Al8Mn5 to Low Temperature (LT) -Al11Mn4 phase. This leads to a shell type structure of LT-Al11Mn4 encapsulating γ2-Al8Mn5 and the formation of cracks in the LT-Al11Mn4 phase. These can propagate during external loading, affecting the mechanical properties. Additionally, the content of Fe and Si decreased in the LT-Al11Mn4, which could potentially decrease locally the corrosion resistance.
|Number of pages||9|
|Journal||Journal of Alloys and Compounds|
|Publication status||Published - 25 Aug 2021|
Bibliographical noteFunding Information:
SSS acknowledges the financial support received from IIT Kanpur (Project No: IITK/MET/2015372 ). JJ acknowledges the financial assistance provided by the India-Birmingham Institute Fellowship during his stay at Birmingham. We also acknowledge the Electron Microscopy Facility support at the Advanced Center for Materials Science ( ACMS ) at IIT Kanpur for characterization.
© 2021 Elsevier B.V.
- Atom probe tomography
- Transmission electron microscopy
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry