Stress corrosion cracking of NiTi in artificial saliva
Wang, Jianqiu; Li, Nianxing; Rao, Guangbin; Han, En-hou; Ke, Wei
Corresponding AuthorWang, Jianqiu(
Source PublicationDENTAL MATERIALS
AbstractObjectives. This paper aimed to study the mechanism of the cracking of orthodontic NiTi wire. Methods. Two orthodontic NiTi wires were subjected: (1) optical and scanning electron microscopy (SEM) to observe the fracture surface; (2) energy dispersive X-ray spectroscopy to determine the composition of the surface product; (3) anodic polarization to remove the surface product. Samples of NiTi alloy were subjected to the constant loading test to study the stress corrosion cracking (SCC) behavior of NiTi shape memory alloy in artificial saliva. Results. The results showed that there were three typical areas at the fracture surface of NiTi orthodontic wire. Area '1' was a tool-made notch. Crack initiated from the root of this notch and propagated to form Area '2', which was perpendicular to the wire axis and covered by surface film. This film consisted of Na, K, Cl, P, S and O except Ni and Ti. The cracking process of NiTi alloy under the constant loading test depended on the pH of saliva and applied stress. The crack length was about 262 mu m, the longest at 300 MPa and pH 3.0. Significance. A tool-made notch in orthodontic NiTi wires can cause SCC. At high stress and low pH, this NiTi alloy was most sensitive to cracking. (C) 2006 Published by Elsevier Ltd on behalf of Academy of Dental Materials. All rights reserved.
KeywordNiTi shape memory alloy failure analysis orthodontic stress corrosion cracking constant loading saliva
Indexed BySCI
WOS Research AreaDentistry, Oral Surgery & Medicine ; Materials Science
WOS SubjectDentistry, Oral Surgery & Medicine ; Materials Science, Biomaterials
WOS IDWOS:000244010100001
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Cited Times:32[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorWang, Jianqiu
AffiliationChinese Acad Sci, Environm Corros Ctr, Met Res Inst, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Wang, Jianqiu,Li, Nianxing,Rao, Guangbin,et al. Stress corrosion cracking of NiTi in artificial saliva[J]. DENTAL MATERIALS,2007,23(2):133-137.
APA Wang, Jianqiu,Li, Nianxing,Rao, Guangbin,Han, En-hou,&Ke, Wei.(2007).Stress corrosion cracking of NiTi in artificial saliva.DENTAL MATERIALS,23(2),133-137.
MLA Wang, Jianqiu,et al."Stress corrosion cracking of NiTi in artificial saliva".DENTAL MATERIALS 23.2(2007):133-137.
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