Abstract
The effect of hydrogen alloying on phase tailoring and mechanical properties of the sintered Ti-13Nb (at pct) shape memory alloy (SMA) was investigated. It was found that hydrogen addition changed the microstructure of the sintered Ti-13Nb-(0-31)H (at pct) alloys gradually from α + β dual phase to single β phase due to the lowered transition temperature of β phase to α phase by hydrogen action. The reduction of α phase precipitation in the alloy reduced the amount of Nb squeezed out from the Nb-depleted α phase, and consequently decreased the mean Nb content in the β phase. Thus, the Ms temperature of Ti-13Nb alloy was successfully increased from lower temperature to near room temperature, which consequently enhanced the recoverable strain of the alloy by easier martensitic transformation. The sintered Ti-13Nb-18H alloy presented a Ms temperature of 22 °C and a remarkable recoverable strain of 3.9 pct at room temperature, which is the highest value ever reported in the sintered Ti-Nb based SMAs. Meanwhile, the Ti-13Nb-18H alloy exhibited a fracture strain of 23.1 pct and a fracture strength of 1321 MPa, both better than that of the Ti-13Nb alloy, which was attributed to the hydrogen atoms in the alloy which caused solid solution strengthening and also increased the content of the β phase with higher plasticity.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
