Restoring the tensile properties of PVD-TiN coated Al 7075-T6 using a post heat treatment

Reza Oskouei; Raafat Ibrahim

doi:10.1016/j.surfcoat.2011.02.041

Restoring the tensile properties of PVD-TiN coated Al 7075-T6 using a post heat treatment

Reza Oskouei, Raafat Ibrahim

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

Abstract

In this work, a post heat treatment cycle is proposed with the aim to recover the lost tensile properties of aluminium alloy 7075-T6 coated with a 3 μm thick titanium nitride (TiN) film by using a physical vapour deposition (PVD) process. First, it was found that the application of the PVD hot process with a high operating temperature of 450°C significantly decreased the tensile properties of the coating-substrate system compared to those of Al 7075-T6. The yield and ultimate strength decreased by 78% and 54%, respectively. However, as a result of re-applying the T6 cycle (as the post heat treatment), substantial improvements of 243% and 77% were achieved in the yield and ultimate strength of the coated material, respectively. Fractography of the failed specimens indicated the TiN coating layer to be satisfactorily adhered to the substrate under tensile loading.

Original language	English
Pages (from-to)	3967-3973
Number of pages	7
Journal	Surface and Coatings Technology
Volume	205
Issue number	15
DOIs	https://doi.org/10.1016/j.surfcoat.2011.02.041
Publication status	Published - 25 Apr 2011

Keywords

Aluminium alloys
Post heat treatment
PVD coatings
Tensile properties

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abstract = "In this work, a post heat treatment cycle is proposed with the aim to recover the lost tensile properties of aluminium alloy 7075-T6 coated with a 3 μm thick titanium nitride (TiN) film by using a physical vapour deposition (PVD) process. First, it was found that the application of the PVD hot process with a high operating temperature of 450°C significantly decreased the tensile properties of the coating-substrate system compared to those of Al 7075-T6. The yield and ultimate strength decreased by 78% and 54%, respectively. However, as a result of re-applying the T6 cycle (as the post heat treatment), substantial improvements of 243% and 77% were achieved in the yield and ultimate strength of the coated material, respectively. Fractography of the failed specimens indicated the TiN coating layer to be satisfactorily adhered to the substrate under tensile loading.",

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AU - Ibrahim, Raafat

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N2 - In this work, a post heat treatment cycle is proposed with the aim to recover the lost tensile properties of aluminium alloy 7075-T6 coated with a 3 μm thick titanium nitride (TiN) film by using a physical vapour deposition (PVD) process. First, it was found that the application of the PVD hot process with a high operating temperature of 450°C significantly decreased the tensile properties of the coating-substrate system compared to those of Al 7075-T6. The yield and ultimate strength decreased by 78% and 54%, respectively. However, as a result of re-applying the T6 cycle (as the post heat treatment), substantial improvements of 243% and 77% were achieved in the yield and ultimate strength of the coated material, respectively. Fractography of the failed specimens indicated the TiN coating layer to be satisfactorily adhered to the substrate under tensile loading.

AB - In this work, a post heat treatment cycle is proposed with the aim to recover the lost tensile properties of aluminium alloy 7075-T6 coated with a 3 μm thick titanium nitride (TiN) film by using a physical vapour deposition (PVD) process. First, it was found that the application of the PVD hot process with a high operating temperature of 450°C significantly decreased the tensile properties of the coating-substrate system compared to those of Al 7075-T6. The yield and ultimate strength decreased by 78% and 54%, respectively. However, as a result of re-applying the T6 cycle (as the post heat treatment), substantial improvements of 243% and 77% were achieved in the yield and ultimate strength of the coated material, respectively. Fractography of the failed specimens indicated the TiN coating layer to be satisfactorily adhered to the substrate under tensile loading.

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