Wear performance of composite dual-layer coated Al-12Si alloy: Effect of Al2Ce reinforcement and micro-arc oxidation

Mertcan Kaba, Sezgin Cengiz, Faiz Muhaffel, Huseyin Cimenoglu*

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Özet

An attempt has been made to enhance the wear resistance of Al-12Si alloy by forming a dual-layer coating consisting of an Al-12Si matrix composite layer (Al-12Si + ∼40 vol % Al2Ce) and an external composite oxide layer. While the hardness of monolithic Al-12Si alloy was ∼110 HV, the Al-12Si matrix composite layer has got hardness of ∼140 HV and exhibited ∼6 times higher sliding wear resistance due to the suppression of the plasticity-induced adhesive wear by Al2Ce particles. Applying micro-arc oxidation (MAO) as a post-treatment favoured an oxide layer (Al2O3) on the Al-12Si alloy and a composite oxide layer (CeO2 + Al2O3) on the Al-12Si matrix composite layer. The MAO coatings fabricated on the Al-12Si alloy and Al-12Si matrix composite layer, with hardness of ∼11 GPa and ∼13 GPa, respectively, provided more than two orders of magnitude increase in the wear resistance by shifting the wear mode to elasticity-dominated wear. However, the critical load imposing the complete detachment of the MAO coating by intense cracking and spallation during testing was determined as 3 N for the MAO'ed Al-12Si alloy and 5 N for the MAO'ed Al-12Si matrix composite layer. The wear resistance of the MAO coating of the Al-12Si matrix composite layer was ∼2 times higher than that of the MAO coating of the Al-12Si alloy below the critical test loads, where the coatings remain intact with the substrate.

Orijinal dilİngilizce
Makale numarası128633
DergiMaterials Chemistry and Physics
Hacim312
DOI'lar
Yayın durumuYayınlandı - 15 Oca 2024

Bibliyografik not

Publisher Copyright:
© 2023 Elsevier B.V.

Finansman

This study was initiated during the postdoc study of Dr. S. Cengiz at Istanbul Technical University under supervision of Dr. H. Cimenoglu. The funding of Istanbul Technical University Scientific Research Project (Grant number MGA-2019-42222 ) is also acknowledged.

FinansörlerFinansör numarası
Istanbul Teknik ÜniversitesiMGA-2019-42222

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