Stress corrosion cracking of NiTi in artificial saliva

doi:10.1016/j.denta1.2006.01.001

CORC > 金属研究所 > 中国科学院金属研究所

	Stress corrosion cracking of NiTi in artificial saliva
	Wang, Jianqiu; Li, Nianxing; Rao, Guangbin; Han, En-hou; Ke, Wei
刊名	DENTAL MATERIALS
	2007-02-01
卷号	23 期号:2 页码:133-137
关键词	NiTi shape memory alloy failure analysis orthodontic stress corrosion cracking constant loading saliva
ISSN号	0109-5641
DOI	10.1016/j.denta1.2006.01.001
通讯作者	Wang, Jianqiu(jiqwang@imr.ac.cn)
英文摘要	Objectives. 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.
WOS研究方向	Dentistry, Oral Surgery & Medicine ; Materials Science
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000244010100001
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/89676]
专题	金属研究所_中国科学院金属研究所
通讯作者	Wang, Jianqiu
作者单位	Chinese Acad Sci, Environm Corros Ctr, Met Res Inst, Shenyang 110016, Peoples R China
推荐引用方式 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.