3D Laser Cladding of Gradient Structures in Ti-Ni-Al System

摘要

Intermetallic phase formation was studied in powdered Ti-Ni-Al system under layerwise laser claddingwith aim of the fabrication of the gradient of properties due to a change in the concentrationrelationship Al into the NiTi powder mixture from one layer to the next. The relationships between thelaser cladding parameters and the intermetallic phase structures in the consecutively cladded layerswere determined. For studying the structure formation an optical microscopy, measurements ofmicrohardness, SEM with EDX analysis were used after the laser synthesis of intermetalliccompounds. Microhardness doubling from 500 HV to 1000 HV was achieved due to nitinol matrixenrichment by Al that is perspective for aerospace applications.