Towards self-repairing metallic materials

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Experimental analysis of niti alloy during strain-controlled low-cycle fatigue

Publication . Lima, Pedro Cunha; Rodrigues, Patrícia Freitas; Ramos, Ana Sofia; da Costa, José D. M.; Braz Fernandes, Francisco Manuel; Vieira, Maria Teresa Freire; DCM - Departamento de Ciência dos Materiais; CENIMAT-i3N - Centro de Investigação de Materiais (Lab. Associado I3N); Molecular Diversity Preservation International (MDPI)

The interaction between the stress-induced martensitic transformation and resistivity behavior of superelastic NiTi shape memory alloy (SMA) was studied. Strain-controlled low-cycle fatigue up to 6% was monitored by in situ electrical resistivity measurements. The experimental results show that a great motion of martensite fronts results in a significant accumulation of defects, as evidenced by transmission electron microscopy (TEM), before and after the tensile cycles. This gives rise to an overall increase of the resistivity values up to the maximum deformation. Therefore, the research suggests that shape memory alloy wire has great potential as a stress sensor inside bulk materials.

2021-08-09Artigo científico

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Entidade financiadora

Fundação para a Ciência e a Tecnologia

Programa de financiamento

9471 - RIDTI

Número da atribuição

PTDC/CTM-CTM/29101/2017