Journal Article

PUBDB-2023-05213

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The mechanism of Fe-rich intermetallic compound formation and growth on inoculants revealed by electron backscattered diffraction and X-ray imaging

Feng, S. (Corresponding author)Extern* ; Jin, Z. ; Du, W. ; Han, I. ; Lui, A.Extern* ; Zhou, X. ; Shearing, P. R. ; Grant, P. S. (Corresponding author) ; Liotti, E. (Corresponding author)Extern*

2023
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.matdes.2023.112110  doi:10.3204/PUBDB-2023-05213

Abstract: Fe-rich intermetallics affect critically the mechanical properties and recyclability of aluminium alloys. Increasing effort has been spent on the inoculation of these intermetallics, hoping to promote a finer distribution. Recently Al-5Ti-1B (wt.%), originally developed to refine -Al, has been shown to refine Al$_{13}$Fe$_4$, an intermetallic phase present in a variety of Al alloys. However, mechanisms of the formation and growth of the intermetallics on the inoculants are unclear. In this paper, Ti is added to Fe-containing Al alloys to produce a large number of potent Al$_3$Ti particles, the active inoculant in Al-5Ti-1B. We use a combination of electron backscattered diffraction, in situ synchrotron X-ray radiography and post-solidification X-ray computed tomography to investigate the formation and growth of primary Al$_{13}$Fe$_4$ on Al$_3$Ti inoculants, first in a model Al-Fe alloy, with key insights then confirmed in a high Fe-containing, recycled 6xxx alloy. Crystallographic orientation relationships between Al$_{13}$Fe$_4$ and Al$_3$Ti are analysed comprehensively, and the formation and growth dynamics of Al$_{13}$Fe$_4$ on Al$_3$Ti is also unveiled. A strong link is revealed between the formation of Al$_{13}$Fe$_4$ on Al$_3$Ti and a twinning-related pseudo-symmetry of Al$_{13}$Fe$_4$. Finally, a potential strategy to refine both intermetallics and -Al in recycled alloys with elevated Fe concentration is proposed.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)

Experiment(s):

1. PETRA Beamline P05 (PETRA III)

Appears in the scientific report 2023

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Database coverage:
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