Tensile actuation response of additively manufactured nickel-titanium shape memory alloys. (15th March 2018)

• Record Type: Journal Article
• Authors: Sam, J.; Franco, B.; Ma, J.; Karaman, I.; Elwany, A.; Mabe, J.H.
• Is Part Of: Scripta materialia. Number 146(2018)
• Page Start: 164
• Page End: 168
• Publication Date: 2018-03-15
• Subjects: Additive manufacturing -- Shape memory alloys -- NiTi -- Selective laser melting -- Actuation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.11.013
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: In the present work, we characterize the tensile shape memory actuation behavior of NiTi shape memory alloys (SMAs) fabricated using laser powder bed fusion (L-PBF) additive manufacturing process. The samples were fabricated using two different sets of processing parameters. While reversible tensile shape memory behavior was observed in both cases, the samples fabricated with a shorter hatch spacing exhibited higher transformation temperatures, lower actuation strain, and lower irrecoverable strain compared to the samples fabricated with wider hatch spacing. The actuation strain and ductility of the L-PBF samples were lower than that of the conventionally manufactured NiTi SMA samples. Graphical abstract: Changes in powder bed additive manufacturing process parameters (AM120 and AM35) notably change the martensitic transformation temperatures, tensile actuation response, actuation strain levels, and the sample-to-sample variation in shape memory characteristics as compared to the conventionally manufactured NiTi SMAs, providing an opportunity to manipulate the properties by controlling the process parameters. Image 1