Acta Metallurgica Sinica (English Letters) ›› 2023, Vol. 36 ›› Issue (6): 926-936.DOI: 10.1007/s40195-023-01523-w

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Compression Behavior and Failure Mechanisms of Bionic Porous NiTi Structures Built via Selective Laser Melting

Xiaolong Zhang1, Yue Jiang1, Shupeng Wang1(), Shuo Wang2, Ziqiang Wang1, Zhenglei Yu1, Zhihui Zhang1(), Luquan Ren1   

  1. 1Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun 130022, China
    2Luoyang Ship Material Research Institute, Luoyang 471023, China
  • Received:2022-10-17 Revised:2022-11-21 Accepted:2022-11-21 Online:2023-06-10 Published:2023-01-16
  • Contact: Shupeng Wang,wsp@jlu.edu.cn; Zhihui Zhang,zhzh@jlu.edu.cn

Abstract:

Inspired by the crystal microstructure of metals and the bamboo, the bionic porous NiTi structures with the porosities in the range of 75.8%-84.9% were built via selective laser melting (SLM). The compression behavior and the failure mechanisms of the porous NiTi structures were evaluated. It demonstrated an increase in the elastic modulus and ultimate strength when the porosity was decreased, from 3.06 to 7.66 GPa and from 34.1 to 147.6 MPa, respectively. The relationship between the elastic modulus and the porosity obtained by the finite element analysis exhibited similar tendency with the experiment, and agreed well with the Gibson-Ashby model's prediction. Based on the theoretical model above and the observation of the deformation processing, the plastic deformation behavior and failure mechanisms of the SLMed porous NiTi structures were analyzed.

Key words: Selective laser melting, NiTi shape memory alloys, Additive manufacturing, Porous structure, Bionic design