Selective leaching and surface properties of Ti50Ni50−xCux (x=0–20at.%) shape memory alloys for biomedical applications

Chang, Shih‐Hang; Chiu, Wei-Chen

doi:10.1016/j.apsusc.2014.10.030

Cited by 13 publications

(17 citation statements)

References 31 publications

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“…Moreover, the i corr values for the Cu12.5Al4Ni, Cu13.0Al4Ni, and Cu13.5Al 4Ni SMAs were calculated as (9.31 « 0.489) © 10 ¹6 , (8.54 « 0.468) © 10 ¹6 , and (12.2 « 0.796) © 10 ¹6 A/cm 2 , respectively. Compared with our previous studies, 18,19) the E corr values for the CuXAl4Ni SMAs (approximately ¹0.2 V) are slightly higher than those of the Ti 50 Ni 50 (approximately ¹0.496 V), Ti 50 Ni 50¹x Cu x (from ¹0.330 to ¹0.416 V), and Ti 50 Ni 50¹x Fe x (from ¹0.379 to ¹0.433 V) SMAs. However, the i corr values for the CuXAl4Ni SMAs (approximately 10 © 10 ¹6 A/cm 2 ) are also higher than those of the Ti 50 Ni 50 (approximately 7.57 © 10 ¹7 A/cm 2 ), Ti 50 Ni 50¹x Cu x (from 2.43 © 10 ¹7 to 4.13 © 10 ¹7 A/cm 2 ), and Ti 50 Ni 50¹x Fe x (from 3.27 © 10 ¹7 to 5.52 © 10 ¹6 A/cm 2 ) SMAs.…”

Section: Electrochemical Propertiescontrasting

confidence: 80%

“…Gil et al 1517) studied the Ni release behaviors of TiNi orthodontic archwires and reported that the titanium oxide on their surface significantly improves the corrosion resistance and decreases the Ni ion release of the alloys. Chang et al 18,19) reported that TiNiCu and TiNiFe SMAs exhibited higher selective leaching rates of Ni ions compared to that of TiNi SMA.…”

Section: Introductionmentioning

confidence: 99%

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Selective Leaching and Surface Properties of Cu–Al–Ni Shape Memory Alloys

2018

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This study investigated the selective leaching, chemical compositions, and electrochemical properties of CuXAl4Ni (X = 12.5, 13.0, and 13.5) shape memory alloys (SMAs). The selective leaching results showed that the CuXAl4Ni SMAs released approximately 200 ppb of Cu ions, 200 ppb of Al ions, and 600 ppb of Ni ions after immersion in Ringer's solution for 90 days. The low concentrations of Cu and Al ions stem from the oxidation of Cu and Al atoms near the surface of the CuXAl4Ni SMAs to form Cu 2 O and Al 2 O 3 films. The selective leaching properties of the CuXAl4Ni SMAs were inferior to that of the TiNi SMA, which possessed a highly passive TiO 2 film on the surface, but were much better than those of the TiNiCu and TiNiFe SMAs, whose TiO 2 films were deteriorated by the formation of NiO, Cu 2 O, and Fe 2 O 3 oxides. CuXAl4Ni SMAs are potential candidates to serve as biomaterials, owing to their acceptable surface and selective leaching properties, high martensitic transformation temperatures, low cost, good machinability, and excellent electric and thermal conductivities.

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Section: Electrochemical Propertiescontrasting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Selective Leaching and Surface Properties of Cu–Al–Ni Shape Memory Alloys

2018

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“…23 However, during the current study, we observed high concentrations of selectively leached Ni and Fe ions. This suggests that the NiO and Fe 2 O 3 oxides that formed on the surfaces of the Ti 50 Ni 50-x Fe x SMAs caused a deterioration of the uniformity of the TiO 2 oxide films and, therefore, of their protective effect.…”

Section: Electrochemical Propertiesmentioning

confidence: 46%

“…These metallic ions pose a potential health hazard capable of inducing allergic reactions or even promoting the onset of cancer. [17][18][19] Several researches had previously investigated the selective leaching behaviour of TiNi and TiNiCu SMAs [20][21][22][23] ; however, the selective leaching of Ti, Ni, and Fe ions released from TiNiFe SMAs has not been studied. Therefore, this study investigated the selective leaching and surface properties of Ti 50 Ni 50-x Fe x (x = 1, 2, and 3) SMAs using inductively coupled plasma mass spectrometry (ICP-MS), an X-ray diffraction (XRD) analysis, electrochemical tests, and X-ray photoelectron spectroscopy (XPS).…”

Section: Introductionmentioning

confidence: 99%

Selective leaching and surface properties of TiNiFe shape-memory alloys

Chang¹,

Liou²,

Huang³

2017

Mater. tehnol.

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This study investigated the selective leaching and surface characteristics of Ti50Ni50-xFex (x = 1, 2, and 3) shape-memory alloys using inductively coupled plasma-mass spectrometry, X-ray diffractometry, electrochemical tests and X-ray photoelectron spectroscopy. According to our results, the concentrations of Ni and Fe ions selectively leached from each specimen were considerably higher than that of Ti ions. Electrochemical tests revealed a gradual deterioration in the corrosion resistance of the Ti50Ni50-xFex SMAs as the Fe content in the alloys was increased. X-ray photoelectron-spectroscopy results indicate that the surface of each specimen is primarily made up of a passive TiO2 film. NiO and Fe2O3 oxides, which also formed on the surfaces of the Ti50Ni50-xFex SMAs, caused a deterioration of the uniformity, undermining the protective effect of the TiO2 films, resulting in a highly selective leaching of the Ni and Fe ions. The Ti50Ni50-xFex SMAs exhibit a number of favourable properties compared to the other SMAs; however, high concentrations of selectively leached Ni and Fe ions may pose a risk in biomedical applications, particularly when used as implant materials. Keywords: TiNiFe shape-memory alloys, biomaterials, selective leaching, corrosion, X-ray photoelectron spectroscopy V {tudiji je prou~evano selektivno izpiranje in zna~ilnosti povr{ine zlitine s spominom Ti50Ni50-xFex (x = 1, 2, in 3), z uporabo masne spektrometrije z induktivno sklopljeno plazmo, rentgensko difrakcijo, elektrokemijskimi preizkusi in rentgensko fotoelektronsko spektroskopijo. Rezultati ka`ejo, da je bila koncentracija selektivno izpranih Ni in Fe ionov iz vsakega vzorca veliko ve~ja kot pa Ti ionov. Elektrokemijski preizkusi so pokazali postopno zmanj{anje korozijske odpornosti Ti50Ni50-xFex SMA, ko je vsebvnost Fe v zlitinah nara{~ala. Rezultati rentgenske fotoelektronske spektroskopije ka`ejo, da je povr{ina vseh vzorcev predvsem sestavljena iz pasivnih TiO2 plasti. NiO in Fe2O3 oksidi, ki so tudi nastali na povr{ini Ti50Ni50-xFex SMAs, poslab{ajo enotnost in ogro`ajo varovalno plast iz TiO2 prevlek, kar ima za posledico bolj selektivno izpiranje ionov Ni in Fe. Ti50Ni50-xFex SMAs vsebuje {tevilne ugodne lastnosti v primerjavi z drugimi SMA; vendar pa velika koncentracija selektivno izpranih Ni in Fe ionov lahko predstavlja tveganje pri biomedicinski uporabi, posebno pri implantiranih materialih. Klju~ne besede: TiNiFe zlitine s spominom, biomateriali, selektivno izpiranje, korozija, rentgenska fotoelektronska spektroskopija

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“…TiNi-based shape memory alloys (SMAs) have been widely used in the aerospace and biomedical fields because of their superior shape memory effect (SME), high superelasticity, and favorable biocompatibility [1][2][3][4][5]. In order to fulfill the requirement of high response frequency in the automotive and aerospace industries, TiNiCu SMAs in which Cu substitutes for Ni have been widely studied due to their narrow martensitic transformation (MT) temperature hysteresis in comparison with TiNi binary alloys [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Effect of Cu Content on Atomic Positions of Ti50Ni50−xCux Shape Memory Alloys Based on Density Functional Theory Calculations

Gou

Liu

2015

Metals

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Abstract:The study of crystal structures in shape memory alloys is of fundamental importance for understanding the shape memory effect. In order to investigate the mechanism of how Cu content affects martensite crystal structures of TiNiCu alloys, the present research examines the atomic displacement of Ti50Ni50−xCux (x = 0, 5, 12.5, 15, 18.75, 20, 25) shape memory alloys using density functional theory (DFT). By the introduction of Cu atoms into TiNi martensite crystal to replace Ni, the displacements of Ti and Ni/Cu atoms along the x-axis are obvious, but they are minimal along the y-and z-axes. It is found that along the x-axis, the two Ti atoms in the unit cell move in opposite directions, and the same occurred with the two Ni/Cu atoms. With increasing Cu content, the distance between the two Ni/Cu atoms increases while the Ti atoms draw closer along the x-axis, leading to a rotation of the (100) plane, which is responsible for the decrease in the monoclinic angle. It is also found that the displacements of both Ti atoms and Ni/Cu atoms along the x-axis are progressive, which results in a gradual change of monoclinic angle and a transition to B19 martensite crystal structure.

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Selective leaching and surface properties of Ti50Ni50−xCux (x=0–20at.%) shape memory alloys for biomedical applications

Cited by 13 publications

References 31 publications

Selective Leaching and Surface Properties of Cu–Al–Ni Shape Memory Alloys

Selective Leaching and Surface Properties of Cu–Al–Ni Shape Memory Alloys

Selective leaching and surface properties of TiNiFe shape-memory alloys

Effect of Cu Content on Atomic Positions of Ti50Ni50−xCux Shape Memory Alloys Based on Density Functional Theory Calculations

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