Selective laser melted high Ni content TiNi alloy with superior superelasticity and hardwearing

• High quality Ti 47 Ni 53 alloy is fabricated by the SLM for first time. The microstructure of SLM-Ti has been systemically studied. Compressive deformation behavior explored in-situ HE-XRD. Synergy relationship between transforming matrix and elastic 4 3 revealed. This work a favorable reference preparing other high content TiNi alloys. alloys with (52–55 at.%) are perfectly suitable wear- corrosion-resistant parts that service on space station, spacecraft, submarine, because their superior superelasticity, strength, hardwearing. However, fabrication complicated Ni-rich traditional machining method often faces problems poor precision, low efficiency, cost. In this work, we succeed in an excellent selective laser melting (SLM), thus, open new way efficient precise formation superelasticity An optimized processing window compact without defects reported. elaborately exhibited breaking strain 11%, stress 2.0 GPa, superelastic 9%, better hardwearing than casting quenched alloy. Besides, microstructure, phase transformation, deformation, as well influence mechanisms investigated situ transmission electron microscope (TEM) high-energy X-ray diffraction (HE-XRD). results obtained significance both fundamental research technological applications SLM-fabricated