|About this Abstract
||Materials Science & Technology 2019
||Advanced Manufacturing, Processing, Characterization and Modeling of Functional Materials
||The Influence of Heat Treatment on the Transformation Behavior of Additively Manufactured NiTiHf Shape Memory Alloys
||Guher Pelin Toker, Mohammadreza Nematollahi, Sayed Ehsan Saghainan, Othmane Benafan, Keyvan Baghbaderani, Mohammad Elahinia , Haluk Karaca
|On-Site Speaker (Planned)
||Guher Pelin Toker
In this study, shape memory properties of additively manufactured NiTiHf high-temperature shape memory alloys were investigated in the as-fabricated and heat-treated conditions. Samples were fabricated with low, mid and high laser power followed by homogenization and/or aging at 550 oC for 3hr. It was found that the low and mid power settings resulted in Ni-rich compositions, and aging improved the shape memory effect and superelasticity compared to the as-fabricated samples. On the other hand, the higher laser power yielded Ti-rich composition due to the Ni-evaporation during the process, and as expected no major effect from the heat treatments were observed. Shape memory behavior with 1.6 % recoverable strain at 500 MPa was observed in the as-fabricated low laser power sample which is similar to as-extruded results. Additionally, it will be shown transformation strain can be altered from 0.5 to 2% through the selection of SLM process parameters and heat treatments.