Abstract
Ceramic particles have been used as reinforcements to improve the mechanical properties of NiTi-based shape memory alloys (SMAs). However, the complicated effects of ceramic particles on constituent field and lattice strain field of the matrix, especially during the laser processing, bring a great challenge to tailor the shape memory effect and superelasticity of NiTi SMAs. In this chapter, TiC as the reinforcement was chosen and Ti-Ni-TiC mixed powder was prepared and processed by laser powder bed fusion. The effect of laser processing parameters on densification behavior, phase composition, microstructure feature, and mechanical properties of in-situ fabricated TiC/NiTi composites was systematically studied. The nonequilibrium melting behavior of TiC particles and the nucleation/growth mechanism of Ti6C3.75 dendrites were disclosed. The evolution of morphology and content of nanoscale Ni4Ti3 precipitates with laser volumetric energy density was revealed. This work can provide a significant guidance for laser processing control for developing the superelastic composites.
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