TY - JOUR
T1 - Restoring the tensile properties of PVD-TiN coated Al 7075-T6 using a post heat treatment
AU - Oskouei, Reza
AU - Ibrahim, Raafat
PY - 2011/4/25
Y1 - 2011/4/25
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.
KW - Aluminium alloys
KW - Post heat treatment
KW - PVD coatings
KW - Tensile properties
UR - http://www.scopus.com/inward/record.url?scp=79952735388&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2011.02.041
DO - 10.1016/j.surfcoat.2011.02.041
M3 - Article
VL - 205
SP - 3967
EP - 3973
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
SN - 0257-8972
IS - 15
ER -