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Mechanical property strengthening by post-heat treatments in NiTiCu shape memory alloys fabricated by twin-wire arc additive manufacturing
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Orientador(es)
Resumo(s)
To address the challenges of wide transformation hysteresis as well as the poor properties of NiTi-based alloys fabricated by twin-wire arc additive manufacturing, post-heat treatments were employed in as-deposited NiTiCu alloys. After aging at 450°C, 550°C, and 650°C, the alloys exhibited significant reduction in the precipitate sizes, narrow transformation hysteresis, uniform distribution of microhardness, and substantial improvement in mechanical properties. With the increase of the aging temperature, the matrix grain size and the precipitate size coarsened, which was detrimental to the resultant mechanical properties. The alloys aged at 450°C exhibited the narrowest transformation hysteresis of 11.7°C and optimal mechanical properties (tensile strength of 539 MPa and fracture strain of 6.9%). The enhancement of mechanical properties can be attributed to the smaller matrix grain size and precipitate size and the higher proportion of high-angle grain boundaries in this material condition. This work provides practical significance for the twin-wire arc additive manufacturing and performance optimisation of NiTi-based ternary alloys.
Descrição
National Natural Science Foundation of China [grant number: 52175292]; Science and Technology Project of Sichuan Province [grant number: 23NSFJQ0064, 2023ZHCG0002, and 2024JDHJ0032]. This work was supported by National Natural Science Foundation of China (Grant No. 52175292), Science and Technology Project of Sichuan Province (Grant Nos. 23NSFJQ0064, 2023ZHCG0002 and 2024JDHJ0032).
The authors acknowledge DESY (Hamburg, Germany), a member of the Helmholtz Association HGF, for providing the experimental facilities. Part of this study was conducted at PETRA III.
Publisher Copyright:
© 2025 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.
Palavras-chave
mechanical properties phase transformation post-heat treatment precipitates Twin-wire arc additive manufacturing Signal Processing Modelling and Simulation Computer Graphics and Computer-Aided Design Industrial and Manufacturing Engineering SDG 9 - Industry, Innovation, and Infrastructure