Experimental Analysis of NiTi Alloy during Strain-Controlled Low-Cycle Fatigue

Materials

Francisco Manuel Braz Fernandes¹  Ana Sofia Ramos²  Patrícia Freitas Rodrigues²  Maria Teresa Vieira²  Pedro Cunha Lima²  José D. M. da Costa² 

[1] CENIMAT/I3N, Materials Science Department, NOVA School of Science and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal;University of Coimbra, CEMMPRE, Department of Mechanical Engineering, 3030-790 Coimbra, Portugal;

关键词: NiTi;    shape memory alloy;    stress-induced martensite;    resistivity;   

DOI  :  10.3390/ma14164455

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown