On the microstructure and tensile behaviour of nanostructured NiTi alloy produced by electroplastic rolling
Tilak Kumar, J. V. and Jayaprakasam, S. and Senthil Kumar, V. S. and Padmanabhan, K. A. and Frolova, A. and Stolyarov, V. (2022) On the microstructure and tensile behaviour of nanostructured NiTi alloy produced by electroplastic rolling. Letters on Materials, 12 (2). pp. 83-88. ISSN 2410-3535 (https://doi.org/10.22226/2410-3535-2022-2-83-88)
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Abstract
Electroplastic rolling was employed to produce nanostructured (NS), near-equiatomic NiTi alloy from a coarse grained NiTi nugget (ingot), which was produced using vacuum induction melting, followed by quenching in water from a temperature of 800°C. The microstructure of NS NiTi was characterized using X-ray Diffraction (XRD) and transmission electron microscopy (TEM). XRD analysis revealed that the NS NiTi is predominantly martensitic at room temperature, with less than ≈10 % of the austenite phase. The NS NiTi alloy has an average grain size of ≈36 nm. TEM investigation confirmed the presence of grains that are less than 10 nm in size and no amorphous zones were detected. The NS martensitic NiTi alloy specimens were tested in tension at two different strain rates (10−2 and 10−1 s−1). In contrast to a stress-strain profile expected in a martensitic NiTi alloy, the stress-strain curves show conventional tensile behaviour. The observed UTS was high, around ≈1800 MPa, with a less than usual elongation to failure of ≈6 %. The presence of dimples on the fracture surfaces can be seen in scanning electron microscopy (SEM) images, which is indicative of ductile fracture. The role of grain size in the observed deformation and fracture features is also discussed.
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Item type: Article ID code: 81219 Dates: DateEventJune 2022Published30 June 2022Published Online9 March 2022AcceptedSubjects: Technology > Mechanical engineering and machinery Department: Faculty of Engineering > Design, Manufacture and Engineering Management > Advanced Forming Research Centre (AFRC) Depositing user: Pure Administrator Date deposited: 21 Jun 2022 13:59 Last modified: 03 Sep 2024 01:09 URI: https://strathprints.strath.ac.uk/id/eprint/81219