Morphological effects of Fe-based intermetallics on tensile behavior of Al–Si alloys

Journal article

Authors/Editors

Strategic Research Themes

Materials Processing (Innovative Materials, Manufacturing and Construction)

Publication Details

Author list: Pandee, P.; Hemwat, J.; Putthamwong, N.; Sathapanarit, P.; Wangwatcharakul, W.; Siriraksophon, K.; Uthaisangsuk, V.

Publisher: Springer

Publication year: 2025

Journal: Archives of Civil and Mechanical Engineering (1644-9665)

Volume number: 25

Issue number: #

Start page: 293

ISSN: 1644-9665

eISSN: 2083-3318

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-105018195912&doi=10.1007%2Fs43452-025-01349-6&partnerID=40&md5=eda1f09717722cf800952bd22924064a

Languages: English-Great Britain (EN-GB)

View on publisher site

Abstract

Iron (Fe), a common impurity in recycled aluminum alloys, generally promotes the formation of acicular Fe-rich intermetallic phases, which can deteriorate their final mechanical properties, especially their ductility. This study investigated influences of Fe-rich phase morphologies on the tensile behaviors of hypoeutectic Al–Si alloys and the role of manganese (Mn) in modifying these phases. Cast aluminum alloys with varying Fe and Mn contents were examined by means of microstructure characterization, microhardness, tensile test, and a micromechanics-based model using 2D representative volume elements (RVEs). It was found that RVE simulations accurately predicted the stress–strain characteristics of the alloys with different compositions and varying Fe-rich intermetallic phases. Acicular intermetallics occurred certainly led to stress accumulations at boundary regions of eutectic and aluminum matrix phases throughout microstructure, inducing premature failure and decreased total elongations. Moreover, the addition of Mn transformed such acicular morphology into granular or Chinese-script shape, mitigating earlier local plastic localization and risk of crack development. It was highlighted that interplay between the modified morphologies of intermetallic phases and properties of the surrounding phases by the Mn alloying greatly affected local stress and strain distributions and subsequent cracking mechanism, thereby mechanical performances of recycled Al–Si alloys. The RVE approach could provide critical insights for alloy design optimization, particularly in aluminum recycling applications, where essential strength and ductility balance depend on inevitable impurities. © Wroclaw University of Science and Technology 2025.

Keywords

No matching items found.