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Temperature and strain-rate dependence of the superelastic response in EBF3-fabricated and post-heat-treated NiTi shape memory alloy
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Resumo(s)
In the present work, the temperature and strain-rate dependence of the superelastic response behavior of NiTi shape memory alloys prepared via electron beam freeform fabrication (EBF3) technique and post-heat-treated is systematically studied. It is demonstrated that the response hysteresis of the EBF3-fabricated NiTi alloys during superelastic cycling decreases with increasing strain-rate at the same test temperature. However, the superelastic response of material gradually alters to a nearly linear mode with the increase of test temperature under the same strain-rate. The corresponding stable superelasticity recovery ratio decreases from 62.6 % to 47.6 % when the test temperature improves from 100 °C to 150 °C. This is mainly due to the activation of dislocations in the {011}<001> slip system of B2 austenite, in which they become plugged and entangled during plastic deformation, deteriorating the material superelastic recovery ability. These findings provide a selection basis for the service conditions of the rapidly prepared NiTi alloys under EBF3-fabrication and post-heat-treatment technology routes.
Descrição
This work was supported by the National Key Research and Development Program of China (Grant no. 2022YFF0609000 ), National Natural Science Foundation of China (Grant no. 51871075 and 52171034 ), and the Foundation of National Key Laboratory for Precision Hot Processing of Metals ( JCKYS2022603C003 ).
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© 2024 The Authors
Palavras-chave
EBF-Fabricated and post-heat-treated Martensite and dislocation Superelastic response Temperature and strain-rate Ceramics and Composites Biomaterials Surfaces, Coatings and Films Metals and Alloys SDG 9 - Industry, Innovation, and Infrastructure