TY  - JOUR
T1  - Influence of Al Content and Bias Voltage on the Microstructure of Ti<SUB>1-x</SUB>AL<SUB>x</SUB>N Hard Coatings
AU - Aliaj, Fisnik AU - Syla, Naim 
JO  - Journal of Engineering and Applied Sciences
VL  - 5
IS  - 6
SP  - 394
EP  - 402
PY  - 2010
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2010.394.402
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2010.394.402
KW  - Bias voltage
KW  -cathodic arc evaporation
KW  -hard coatings
KW  -GAXRD
KW  -residual stress
KW  -Ti-Al-N
AB  - Titanium Aluminum Nitride (Ti-Al-N) system is a well established hard coating known for their good physical, chemical and mechanical properties that is used in a variety of fields. The aim of this research is to investigate the influence of bias voltage and aluminum content on the microstructure, chemical composition and the residual stress of Ti-Al-N in order to illuminate the possibility of tailoring the coating properties mentioned above. Four groups of Ti<SUB>1-x</SUB>Al<SUB>x</SUB>N coatings were deposited by Cathodic Arc Evaporation (CAE) using powder metallurgical targets of Ti<SUB>1-xT</SUB>Al<SUB>xT</SUB> with x<SUB>T</SUB> = 0.50, 0.55, 0.60 and 0.66. The coatings were deposited onto cemented carbide (WC-Co) substrates at a temperature of 500&deg;C, at different bias voltages: -25, -50 and -100 V. Structural characterization of the coatings was performed with Glancing Angle X-Ray Diffraction (GAXRD) and Glow Discharge Optical Emission Spectroscopy (GDOES). The microstructure of the coatings changed from predominantly single-phase fcc for <I>x</I> between ~0.50 and ~0.60 to dual phase fcc+hcp for x = ~0.66. The residual stress and the stress-free lattice parameter were analyzed using GAXRD and the sin<SUP>2</SUP>&#936; method was used to evaluate the data. Young&#146;s modulus of 500 GPa and Poisson&#146;s ratio of 0.3 were utilized in the evaluation. Residual compressive stress increased for about 4 GPa with increasing bias from -25 to -50 V. Further increasing bias from -50 to -100 V resulted only in an increase of about 1GPa. This investigation shows clearly the relations between the target and coating composition where bias is an important parameter.
ER  -