|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||Mechanical Properties and Joining of Additively Manufactured Ti-Nb-Zr-Ta Alloy Parts with HEA Fillers
||Eugene Y. Ivanov, Alexander E. Shapiro
|On-Site Speaker (Planned)
||Eugene Y. Ivanov
Strips and rods of Ti-35Nb-7Zr-5Ta alloy (TNZT) suitable for aerospace structures were made by additive manufacturing using gas-atomized fully-alloyed powder. Vacuum brazing of TNZT was carried out at 920°C by TiBraze200 (Ti-20Zr-20Cu-20Ni wt.%) and at 1080°C by TiBraze200Nb (Ti-11Zr-11Cu-16Ni-17Nb at.%) filler metals. Microstructures and mechanical properties of base metal and brazed joints are reported.
Microstructures and phase compositions were studied by optical and scanning electron microscopies using EDX analysis. Density of resulting TNZT strips is >99.9% of theoretical value, tensile strength and yield strength are R0.2 = Proof Strength 484 MPa, Rm = Tensile strength 519 MPa with 24% elongation. The TNZT alloy after additive manufacturing is a beta phase, while the joint metal is characterizable as a high entropy alloy (HEA) joint. Shear strengths of brazed joints are up to 144.4 MPa for TiBraze200 and up to 196.3 MPa for TiBraze200Nb. Strength of TNZT-alloy-to-alumina-ceramic brazed joints is ~128 MPa.