Abstract
Nanoscale particles (NP) were found in the Ti-Ag-TiB2-Y2O3 laser alloying (LA) coating on a TA7 titanium alloy. Such coating was researched by means of X-ray diffraction (XRD), scanning electron microscope (SEM), and high-resolution transmission electron microscope (HRTEM). Test results indicated that TiAg NP were produced through in situ metallurgical reaction between Ti and Ag in molten pool during LA process, which grew along (111), (200), and (002) planes. Production of NP led the free energy to increase, which increased density of point defect, leading to the formation of hypersaturated state of the point defect, causing the lattice distortions.
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