Nickel (Ni)-titanium (Ti) shape-memory alloy (SMA) is a functional material that has received a higher demand in aerospace industries, biomedical industries, actuator, and sensor industries owing to the property of superelasticity and shape memory effect. In addition, SMAs offer better mechanical and corrosion-resistant properties. In this current work, cryo treatment of NiTi alloy has been carried out to investigate the change in the properties. NiTi SMA prepared by powder metallurgy are cryo treated for 12 hours to 48 hours. Further, a corrosion study has been performed on the cryo-treated NiTi samples with the variation in corrosion time to know the effect on the morphology and the hardness. It is found that cryo-treated NiTi shows higher resistance to corrosion than the non-treated sample. The present work is an attempt to find out the effect of cryo treatment on the hardness and corrosion behavior of NiTi SMA. In the scanning electron microscope (SEM) analysis, it is observed that with the increase in cryo treatment time, NiTi (martensite) phase increases. Similar phases are present in both untreated and cryo-treated NiTi pellets. Out of all cryo-treated NiTi pellets, 24 hours cryo-treated NiTi has a lower percentage of corroded area with an increase in the corrosion exposure time. Corrosion preferentially starts at the pit area and progresses toward the Ti-rich area. The hardness value increased for 48 hours cryo-treated sample when compared with other cryo-treated and untreated NiTi pellets.
SinghAChandakMGSaxenaA. Effect of cryogenic treatment on nickel-titanium endodontic instruments. Int J Dent Clin2013; 5: 4.
2.
PriyadarshiniMBiswasCK. Cryo-treatment of NiTi alloys. In: ThomasSBeheraANguyenTABT-N-TSHM (eds) Micro and nano technologies. Amsterdam: Elsevier, 2022, pp. 57–68.
3.
BeheraARajakDKKolahchiR, et al.Current global scenario of Sputter deposited NiTi smart systems. J Mater Res Technol2020; 9: 14582–14598.
4.
MarupalliBCGBeheraAAichS. A critical review on nickel–titanium thin-film shape memory alloy fabricated by magnetron sputtering and influence of process parameters. Trans Indian Inst Met2021; 74: 2521–2540.
5.
ThompsonSA. An overview of nickel–titanium alloys used in dentistry. Int Endod J2000; 33: 297–310.
6.
KimJWGriggsJAReganJD, et al.Effect of cryogenic treatment on nickel-titanium endodontic instruments. Int Endod J2005; 38: 364–371.
7.
HumbeeckJV. Shape memory alloys: a material and a technology. Adv Eng Mater2001; 3: 837–850.
8.
HuangXAcklandGJRabeKM. Crystal structures and shape-memory behaviour of NiTi. Nat Mater2003; 2: 307–311.
9.
WaliaHBrantleyWAGersteinH. An initial investigation of the bending and torsional properties of Nitinol root canal files. J Endod1988; 14: 346–351.
10.
Mohan LalDRenganarayananSKalanidhiA. Cryogenic treatment to augment wear resistance of tool and die steels. Cryogenics (Guildf)2001; 41: 149–155.
11.
VinothkumarTSMiglaniRLakshminarayanananL. Influence of deep dry cryogenic treatment on cutting efficiency and wear resistance of nickel-titanium rotary endodontic instruments. J Endod2007; 33: 1355–1358.
12.
FuCHSealyMPGuoYB,et al.Austenite–martensite phase transformation of biomedical Nitinol by ball burnishing. J Mater Process Technol2014; 214: 3122–3130. DOI:10.1016/j.jmatprotec.2014.07.019.
13.
de MoraesLCda SilvaTCBarcelosAP. Cryogenic treatment effect on NiTi wire under thermomechanical cycling.Int J Eng Res Technol2018; 5: 1581–1585.
14.
SinghRSinghB. Comparison of cryo treatment effect on machining characteristics of titanium in electric discharge machining. J Int Eng Mech2011; 3: 239–248.
15.
GillSSSinghJ. Effect of deep cryogenic treatment on machinability of titanium alloy (Ti-6246) in electric discharge drilling. Mater Manuf Process2010; 25: 378–385.
16.
HuZZhengHLiuG, et al.Effects of cryogenic treatment after annealing of Ti-6Al-4V alloy sheet on its formability at room temperature. Metals (Basel)2018; 8: 295. DOI:10.3390/met8050295.
17.
ChmielewskaAWysockiBKwaP, et al.Heat treatment of NiTi alloys fabricated using laser powder bed fusion (LPBF) from elementally blended powders. Materials (Basel) 2022 May 5; 15: 3304. DOI: 10.3390/ma15093304.
18.
KauffmanGBMayoI. The story of nitinol: the serendipitous discovery of the memory metal and its applications. Chem Educ1997; 2: 1–21.
19.
SabetYShahsiahSYazdizadehM, et al.Effect of deep cryogenic treatment on cyclic fatigue resistance of controlled memory wire nickel-titanium rotary instruments. Dent Res J (Isfahan)2020; 17: 300–305.
20.
KökMAl-JafAOAÇirakZD, et al.Effects of heat treatment temperatures on phase transformation, thermodynamical parameters, crystal microstructure, and electrical resistivity of NiTiV shape memory alloy. J Therm Anal Calorim2020; 139: 3405–3413.
21.
PandolfiGSMartinsSCBuonoVTL, et al.Precipitation kinetics of Ti3Ni4 and multistage martensitic transformation in an aged Ni–rich Ni–Ti shape memory alloy. J Mater Res Technol2020; 9: 9162–9173.
22.
WestPShunmugasamyVCUsmanCA, et al.Part I.: friction stir welding of equiatomic nickel titanium shape memory alloy – microstructure, mechanical and corrosion behavior. J Adv Join Process2021; 4: 100071. DOI: 10.1016/j.jajp.2021.100071.
23.
BuehlerWJWangFE. A summary of recent research on the nitinol alloys and their potential application in ocean engineering. Ocean Eng1968; 1: 105–120.
24.
BramMAhmad-KhanlouAHeckmannA, et al.Powder metallurgical fabrication processes for NiTi shape memory alloy parts. Mater Sci Eng A2002; 337: 254–263.
25.
MentzJBramMBuchkremerHP, et al.Improvement of mechanical properties of powder metallurgical NiTi shape memory alloys. Adv Eng Mater2006; 8: 247–252.
26.
MentzJFrenzelJWagnerMF-X, et al.Powder metallurgical processing of NiTi shape memory alloys with elevated transformation temperatures. Mater Sci Eng A2008; 491: 270–278.
LaplancheGBirkTSchneiderS, et al.Effect of temperature and texture on the reorientation of martensite variants in NiTi shape memory alloys. Acta Mater2017; 127: 143–152.
29.
NovákPPokornýPVojtěchV, et al.Formation of Ni–Ti intermetallics during reactive sintering at 500–650°C. Mater Chem Phys2015; 155: 113–121.
30.
WangQZHanFSWangQ. Low-frequency damping behavior of CuAlMn shape memory alloy. Phys status Solidi2004; 201: 2910–2914.
31.
GaoXHuangMBrinsonLC. A multivariant micromechanical model for SMAs part 1. Crystallographic issues for single crystal model. Int J Plast2000; 16: 1345–1369.
32.
ChmielewskaADobkowskaAKijeńska-GawrońskaE, et al.Biological and corrosion evaluation of in situ alloyed NiTi fabricated through laser powder bed fusion (LPBF). Int J Mol Sci2021; 22: 13209. DOI:10.3390/ijms222413209.
33.
MoghiminiaSFarsiHRaissiH. Comparative optical and electrochemical studies of nanostructured NiTiO3 and NiTiO3-TiO2 prepared by a low temperature modified sol-gel route. Electrochim Acta2014; 132: 512–523.
34.
ElshamyIHAbd El RehimSSIbrahimMAM, et al.The bifunctional role played by thiocyanate anions on the active dissolution and the passive film of titanium in hydrochloric acid. Corros Eng Sci Technol 2022; 57: 542–552.
35.
SaeedEMDawoodNMHasanSF. Improvement corrosion resistance of Ni-Ti alloy by TiO2 coating and hydroxyaptite/TiO2 composite coating using micro arc oxidation process. Mater Today Proc2021; 42: 2789–2796.
36.
MolinariAPellizzariMGialanellaS, et al.Effect of deep cryogenic treatment on the mechanical properties of tool steels. J Mater Process Technol2001; 118: 350–355.
37.
AkbarpourMRAlipourSNajafiM, et al.Microstructural characterization and enhanced hardness of nanostructured Ni3Ti– NiTi (B2) intermetallic alloy produced by mechanical alloying and fast microwave-assisted sintering process. Intermetallics2021; 131: 107119. DOI: 10.1016/j.intermet.2021.107119.
