Microstructure and mechanical property of Ti-80%Ni alloy prepared by laser solid forming

Ti-80%Ni alloy was prepared by laser solid forming (LSF) under different processing parameters. The microstructure of the alloy consists of η-TiNi₃ phase under low and power P scanning rate v. With the increase of scanning rate, TiNi(B2) + η eutectic appeared, and with the increase of laser power, η laths were broken into bulks and distributed along certain orientation, and (TiNi(B2) + η) devoiced eutectic+inter-lath (TiNi(B2) + η) eutectic appeared. The higher the power is, the finer the η bulks are. And the enhanced power leads to a growing up of (TiNi(B2) + η) eutectic volume fraction. The microstructure became much fine with increasing P and v, while the volumn fraction of hard- brittle η lath decreased, as a result, the laser formability and plasticity of Ti-80%Ni both increased.