|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Titanium Technology
||Effect of aging treatment on microstructure and superelastic properties of a high Zr-containing Ti–Zr–Nb–Sn shape memory alloy
||Shuanglei Li, Yeon-Wook Kim, Jung Gi Kim, Tae-Hyun Nam
|On-Site Speaker (Planned)
In this study, microstructure and superelastic properties of a Ti-40Zr-8Nb-2Sn (at.%) shape memory alloy were studied by transmission electron microscope and in-situ X-ray diffraction. Nanodomains and fine nano-scaled isothermal ω phases were formed in the alloy aged at 573 K for 1 h. The stress-induced β - α" martensitic transformation occurred in spite of the presence of nanodomains. The aged alloy exhibited excellent superelasticity with a large total recovery strain (7.1%), high ductility (11.6%) and high yield stress (578 Mpa), indicating that a good balance of functional and mechanical properties was achieved in the aged alloy when compared with other 573 K/1 h aged β-type Ti alloys showing low yield stress and/or poor ductility. The enhanced yield strength without significant loss of ductility in the aged Ti-40Zr-8Nb-2Sn is ascribed to the restriction of the isothermal ω growth due to the high Zr content and Sn addition.