PVD surface treatment of heat-treated cast aluminium alloys
Journal Title: Archives of Materials Science and Engineering - Year 2016, Vol 79, Issue 2
Abstract
Purpose: Main purpose of the paper is results share of AlSi9Cu and AlSi9Cu4 castaluminium alloys treatment investigation. Processing was performed using CAE-PVDmethod in order to obtain gradient coatings.Design/methodology/approach: CAE-PVD method was used to obtain gradientcoatings on AlSi9Cu and AlSi9Cu4 cast aluminium alloys after heat treatment. Investigationof resulting material was performed using SEM, TEM, GDOS, ball-on-disk wear resistancetest and microhardness test.Findings: The investigations presented in this paper reveal that it was possible to successfullydeposit Cr/CrN/CrN, Cr/CrN/TiN, and Ti/Ti(C,N)/(Ti,Al)N nano-crystalline coatings onAl-Si-Cu aluminium substrate using CAE-PVD method. Investigations of the coatings reveal amicrostructure that adhere tightly to the aluminium substrate without any visible delaminationbut with visible transition zone between the investigated layers and the substrate material.Research limitations/implications: There is need for further research activity in fieldof nanocomposite films and coatings that should concentrate on following problems:controlled grain size of coatings/films, development of hybrid coatings with unique physicaland functional properties, e.g. nanophase biomaterials.Practical implications: Better understanding of mechanisms that proceed duringCAE-PVD treatment of AlSi9Cu and AlSi9Cu4 cast aluminium alloys. Creation of material,that, thanks to the treatment, can be coated with layer characterized by gradient chemicalcomposition with unique physical and functional properties (e.g. higher microhardness orcorrosion resistance, lower friction coefficient, etc.) that can be successfully applied withinaerospace and automotive industry or even on field of biomedical applications with use ofnanophase biomaterials or nano-crystalline amorphous materials.Originality/value: Cr/CrN/CrN, Cr/CrN/TiN, and Ti/Ti(C,N)/(Ti,Al)N nano-crystallinecoatings were deposited on Al-Si-Cu aluminium substrate. They are characterized by visibletransition zone (gradient) between the investigated layers and the substrate material.
Authors and Affiliations
T. Tański, L. A. Dobrzański, M. Wiśniowski, R. Szklarek
Keywords
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