To the relation between the orientation of the pore channels and the mechanical properties of porous NiTi shape memory alloy

E.N. Iaparova, A.E. Volkov, M.E. Evard ORCID logo show affiliations and emails
Received 29 April 2020; Accepted 08 September 2020;
Citation: E.N. Iaparova, A.E. Volkov, M.E. Evard. To the relation between the orientation of the pore channels and the mechanical properties of porous NiTi shape memory alloy. Lett. Mater., 2020, 10(4) 501-505
BibTex   https://doi.org/10.22226/2410-3535-2020-4-501-505

Abstract

The functional and mechanical properties of porous shape memory alloys are determined by the phase transformations and the features of the pore structure. The modeling results aimed at clarifying the influence of these factors on the behavior of porous NiTi.The deformation behavior of porous shape memory alloy (SMA) is determined both by the features of their inhomogeneous structure and the martensitic transformation. The present work shows the results of simulation aimed at clarifying the influence of these factors on the behavior of porous SMA. The structures of porous samples with different orientations of the pore channels are approximated by sets of beams of various configurations, and the constitutive relations of the microstructural model are used for calculations of the strain associated with martensitic transformations. The calculations are performed for a dense SMA sample, porous SMA samples with longitudinal and transverse orientation of the pore channels and similar porous samples that do not undergo martensitic transitions. Simulations of isothermal compression at different temperatures and strain variations at cooling and heating under a constant stress are carried out. It is shown that the reorientation of martensite in a dense SMA specimen begins at a higher stress than in porous specimens. Moreover, a dense sample has a higher yield stress in both austenitic and martensitic states. At the same stress level, a porous SMA sample with transverse pore channels accumulates a larger strain than a sample with longitudinal channels. The same relation is observed for similar samples of an alloy without transformations. Porous SMA accumulates greater strain in comparison with common porous metal due to the reorientation of martensite and pseudoelasticity. The largest strain accumulated on cooling under a constant stress among the samples under consideration occurs in a porous sample with transverse pore channels.

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Funding

1. Russian Foundation for Basic Research - 18-31-00461
2. Russian Foundation for Basic Research - 18-01-00594