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Effect of Stress Aging Induced Precipitates on Corrosion Behavior of NiTi Shape Memory Alloys
A. Radi,J. Khalil‑Allafi,A. Heidarzadeh,G. G. Yapici,M. R. Etminanfar,S. Z. Mozafari,B. Rezaei‑Moghadam 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.10
In this study, the influences of the stress aging process on the electrochemical behaviors toward evaluating corrosion resistanceof NiTi shape memory alloys in the in-vitro condition have been investigated. For this approach, the samples havebeen manufactured by introducing multiple precipitation morphology in the alloy structure via applying different levels ofstresses during the aging process. The samples were characterized using multiply electron microscopy, electrochemicalmethods, X-ray diffraction, and differential scanning calorimetry. Results show that by prolonging aging time from 1 to 5 hand increasing the stress aging level (15–60-150 MPa) the corrosion resistance improves, which is implied a better formationof a protective layer. It seems that homogeneous precipitation of Ni-rich phases under the stress aging process improvesthe corrosion resistance of the alloy.