Abstract
The tensile and fatigue properties of laser powder bed fused Ti-6Al-7Nb are improved by physical vapor deposition (PVD). Thin coatings of titanium nitride (TiN), titanium carbonitride (TiCN), and silver-containing amorphous carbon (a-C:Ag) are deposited by magnetron sputtering. Tensile and strain-controlled low-cycle fatigue tests with various total strain amplitudes are performed. The coatings increase the tensile strength and decrease the breaking elongation. The low-cycle fatigue performance of the PVD-coated conditions, except for the a-C:Ag coating, is improved. The coatings considerably enhance tensile strength and fatigue resistance due to their high residual compressive stresses and increased surface hardness.
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