MICROSTRUCTURE AND MECHANICAL CHARACTERISATION OF TIAL COATED ON Ti64

Bathusile Masina, Thabo Lengopeng, Sisa Pityana, Monnamme Tlotleng

Abstract


In this study, TiAl alloy was coated on Ti64 using a 1074nm high power continuous-wave laser while varying the laser beam scanning speed. This was done in order to increase the thermo-mechanical properties of Ti64. Scanning electron microscopy (SEM), light optical microscopy, and Vickers’ micro-hardness were used to characterise the clad for macrostructure, composition, and hardness respectively. The macro- and micrographs of the clads indicated a needle- and dendritic-rich structure for the clads and widmanstatten structure at the interface for all the scanning speeds. The overall hardness was found to be high at low scanning speed.


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DOI: http://dx.doi.org/10.7166/28-3-1854

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Copyright (c) 2017 Bathusile Masina, Thabo Lengopeng, Sisa Pityana, Monnamme Tlotleng


ISSN 2224-7890 (on-line) ; ISSN 1012-277X (print)


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