Adhesion Behaviour, Nanohardness and Surface Roughness of Ti–6Al–4V–6B4C Thin Films Grown on AISI 1040 Steel
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The nanohardness of Ti–6Al–4V–6B4C thin film coated AISI 1040 steel were investigated using nanoindentation based on an AFM measurement technique. Thin films of Ti–6Al–4V–6B4C were grown by the magnetron sputtering deposition method. X-ray diffraction analysis revealed that the deposited thin films were highly purified. The nanohardness of 18, 14 and 11.3 GPa were obtained for the coating of Ti–6Al–4V–6B4C, Ti–6Al–4V, and bare substrate respectively. The surface roughness (Ra) of 0.5 and 1 h coating were 3.39 and 15.74 nm respectively. The results showed that the B4C particles had a significant effect on the microstructural and mechanical properties of the coatings. The Ti–6Al–4V–6B4C coating was obtained for a coating thickness of 40 and 100 nm for 0.5 and 1 h coating time respectively. In the meantime, the respective coating thickness of Ti–6Al–4V was obtained as 30 and 80 nm for 0.5 and 1 h coating time respectively. Strong adhesion was observed between the Ti–6Al–4V–6B4C coating and AISI 1040 steel substrate than Ti–6Al–4V samples. The adhesion mechanism between the Ti–6Al–4V–6B4C coating, AISI 1040 steel substrate, and the interfacial structure were studied by using scanning electron microscope (SEM). The use of Ti–6Al–4V–6B4C coating could be a novel technique for developing high-performance applications due to excellent adhesion and nanohardness.
KeywordsSputtering Thin films Microstructure Adhesion Indentation and hardness