<p>In this research, Ti-Cu alloy was produced through a new wire-powder synchronous arc additive method. To further reduce the grain size, the sample underwent laser quenching at temperatures greater than 800&#xa0;°C. The tensile test of the preformed alloy showed that its strength was greater than that of the castings. A high-performance Ti-Cu alloy was obtained after laser quenching, especially an increase in Ti₂Cu. As a result, the growth restriction factor of Cu is very high, which can increase the formation of a constitutional supercooling zone. The high thermal gradient effect in the arc melting region during the preparation of additives could be overcome, which has an equiaxed fine grain structure in the prepared Ti-Cu alloy. Laser quenching is useful for grain refinement. After laser quenching, the grain size decreased by 52.9%. The passive layer in sample 2 (laser quenching) is more stable than that in sample 1 (without laser quenching), and it has a higher corrosion resistance. Compared with that of sample 1, the corrosion resistance of sample 2 was 32% greater. It is presumed that sample 2, which has a finer microstructure of α-Ti + Ti₂Cu, has superior properties to sample 1.</p>