Shape memory behavior of NiTiHf alloys fabricated by selective laser melting. (15th March 2020)

• Record Type: Journal Article
• Authors: Toker, Guher P.; Nematollahi, Mohammadreza; Saghaian, Sayed E.; Baghbaderani, Keyvan S.; Benafan, Othmane; Elahinia, Mohammad; Karaca, Haluk E.
• Is Part Of: Scripta materialia. Number 178(2020)
• Page Start: 361
• Page End: 365
• Publication Date: 2020-03-15
• Subjects: NiTiHf -- High-temperature shape memory alloys -- Additive manufacturing -- Selective laser melting; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.11.056
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: This study investigates the high-temperature shape memory behavior of NiTiHf alloys fabricated via selective laser melting process. Specifically, the effects of laser power (100 W and 250 W) on their transformation temperatures, strain, and microstructure were investigated and compared to the ingot. The transformation temperatures of SLM fabricated alloys increased from 150 °C to 350 °C with elevated laser power due to Ni evaporation. The sample fabricated with 100 W showed sharp transformation peaks, good shape memory behavior with recoverable strain of 1.67% and superelasticity. The sample fabricated with 250 W had broad transformation peaks with low recoverable strain of 0.7% during thermal cycling. Graphical abstract: Image, graphical abstract