Additive manufacturing of Ti-Ni bimetallic structures

Materials & Design

Amit Bandyopadhyay¹  Cory J. Groden²  Susmita Bose²  David P. Field²  Ali Afrouzian² 

[1] Corresponding author.;W. M. Keck Biomedical Materials Research Laboratory, School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164, USA;

关键词: Titanium;    Nickel;    Bimetallic structures;    Additive manufacturing;    Directed energy deposition;   

DOI  :  

来源: DOAJ

【 摘 要 】

Bimetallic structures of nickel (Ni) and commercially pure titanium (CP Ti) were manufactured in three different configurations via directed energy deposition (DED)-based metal additive manufacturing (AM). To understand whether the bulk properties of these three composites are dominated by phase formation at the interface, their directional dependence on mechanical properties was tested. X-ray diffraction (XRD) pattern confirmed the intermetallic NiTi phase formation at the interface. Microstructural gradient observed at the heat-affected zone (HAZ) areas. The longitudinal samples showed about 12% elongation, while the same was 36% for the transverse samples. During compressive deformation, strain hardening from dislocation accumulation was observed in the CP Ti and transverse samples, but longitudinal samples demonstrated failures similar to a brittle fracture at the interface. Transverse samples also showed shear band formation indicative of ductile failures. Our results demonstrate that AM can design innovative bimetallic structures with unique directional mechanical properties.

【 授权许可】

Unknown