Achieving superelasticity in additively manufactured Ni-lean NiTi by crystallographic design

JN Zhu and K Liu and T Riemslag and FD Tichelaar and E Borisov and XY Yao and A Popovich and R Huizenga and M Hermans and V Popovich, MATERIALS & DESIGN, 230, 111949 (2023).

DOI: 10.1016/j.matdes.2023.111949

Superelastic metallic materials possessing large recoverable strains are widely used in automotive, aerospace and energy conversion industries. Superelastic materials working at high temperatures and with a wide temperature range are increasingly required for demanding applications. Until recently, hightemperature superelasticity has only been achievable with multicomponent alloys fabricated by complex processes. In this study, a novel framework of multi-scale models enabling texture and microstructure design is proposed for high-performance NiTi fabrication via laser powder bed fusion. Based on the developed framework, a Ni-lean Ni(49.4 at.%)-Ti alloy is, for the first time, endowed with a 4% high- temperature compressive superelasticity. A (001) texture, unfavorable for plastic slip, is created to realize enhanced functionality. The unprecedented superelasticity can be maintained up to 453 K, which is comparable with but has a wider superelastic temperature range (-110 K) than rare earth alloyed NiTi alloys, previously only realizable with grain refinement, and other complicated post-processing operations. At the same time, its shape memory stability is also improved due to existing textured (100) martensite and intergranular precipitation of Ti2NiOx. This discovery reframes the way that we design superior performance NiTi based alloys through directly tailoring crystallographic orientations during additive manufacturing.(c) 2023 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (

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