Author:
Prashantha S.,Auradi Virupaxi,Nagral Mahadev,Patil Shanawaz
Abstract
Because of the good shape memory effect and superelasticity, copper-based shape memory alloys (SMAs) with aluminum and beryllium as binary and ternary elements are widely used in many applications (Cu-Al-Be SMAs). However, they are prone to corrosion in atmospheric conditions. This alloy is susceptible to corrosion due to hydrogen. This affects the characterization of the SMAs by absorbing the hydrogen and results in hydrogen embrittlement, makes changes in SME and SE effect. The process of hydrogen absorption was carried out under electrolytic charging under constant current density and the charged specimens were aged in the air at room temperature. The results show the decrement in SME from 99.8 % to 62%, and the tensile test revealed an increment in the transformation stress level from 200MPa- 290MPa in the case of the charged specimen.
Publisher
Informatics Publishing Limited
Subject
Energy Engineering and Power Technology,Geotechnical Engineering and Engineering Geology,Fuel Technology
Reference14 articles.
1. : Hydrogen embrittlement of nickel-titanium alloy in biological environment;Asaoka;Metall Mater Trans A 33(3),2002
2. C W Ng, A S Mahmud, M F Razali and M N Ahmad, (2020): Effect of hydrogen embrittlement towards thermal and mechanical behaviour of NiTi shape memory alloy. IOP Conf. Ser.: Mater. Sci. Eng. 920, 012033.
3. E F Harris, S M Newman and J A Nicholson, (1988): Nitinol arch wire in a simulated oral environment, Changes in mechanical properties, Am.J. Orthod. 93508-513.
4. : Strain rate response of a Ni-Ti shape memory alloy after hydrogen charging, Phil;Gamaoun;Mag Lett 94(1),2014
5. : Effect of hydrogen on the tensile strength of aged Ni- Ti superelastic alloy, J;Gamaoun;Intel Mat Syst Str 22(17),2011