Comparative study on tribology and microhardness of laser synthesized Ti-Al2O3/Zn coatings on Ti-6Al-4V alloy. (2nd July 2020)

• Record Type: Journal Article
• Authors: Mthisi, A.; Popoola, A.P.I.
• Is Part Of: Tribology. Volume 14:Number 3(2020)
• Page Start: 142
• Page End: 150
• Publication Date: 2020-07-02
• Subjects: Ti-6al-4v alloy -- laser cladding technique -- Ti-Al2O3 coatings -- Ti-Al2O3-Zn coatings; Tribology -- Periodicals; 621.8905
• DOI: 10.1080/17515831.2020.1720380
• Languages: English
• ISSNs: 1751-5831

Abstract

ABSTRACT: The study of laser cladding of 90Ti-10Al2 O3, 90Ti-8Al2 O3 -2Zn and 90Ti-4Al2 O3 -6Zn coatings onto Ti-6Al-4V alloy, with intention to produce defect-less, high microhardness and wear resistant coating was carried out. The coatings were deposited onto Ti-6Al-4V alloy at 900 W laser power and 0.6 m/min laser scan speed. Microstructures and phase constituents of the developed coatings were investigated by using a scanning electron microscope (SEM) and X-ray diffractometer correspondingly. Vickers microhardness tester and pin-on-disk tribometer were employed to characterize microhardness and wear behaviour of the Ti-Al2 O3 /Zn coatings respectively. SEM was also used to examine the worn track. It was observed that 90Ti-10Al2 O3 coating yielded optimal microhardness along with maximal wear resistance in comparison to the other coatings and Ti-6Al-4V alloy. It has been established that laser cladding of Ti-Al2 O3 coating with Zn contents on Ti-6Al-4V alloy alleviates the formation of cracks, however, microhardness and wear properties are negatively affected.