Property improvement of TiNi by Cu addition for orthodontics applications

Conference proceedings article

Authors/Editors

Strategic Research Themes

No matching items found.

Publication Details

Author list: Phukaoluan A., Khantachawana A., Kaewtatip P., Dechkunakorn S., Anuwongnukroh N., Santiwong P., Kajornchaiyakul J.

Publisher: Trans Tech Publications

Publication year: 2011

Volume number: 87

Start page: 95

End page: 100

Number of pages: 6

ISBN: 9783037852309

ISSN: 1660-9336

eISSN: 1662-7482

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-80052951319&doi=10.4028%2fwww.scientific.net%2fAMM.87.95&partnerID=40&md5=5adf33db2fbc31c92571d3eb02113267

Languages: English-Great Britain (EN-GB)

View in Web of Science | View on publisher site | View citing articles in Web of Science

Abstract

This study aims to investigate mechanical properties and transformation behavior of TiNiCu shape memory alloys to obtain optimal conditions for utilizing as orthodontic wires. TiNi binary alloys with Ni-content 50.6 at.%, TiNiCu alloys with Cu-content ranging from 5 to 10 at.%, were prepared. The alloys were melted by electrical arc-melting method and then homogenized at, 800ฐC for 3600 s. The alloys were subsequently sliced into thin plates (1.5 mm) by EDM wire cutting machine. To evaluate mechanical properties, the specimens were cold-rolled with 10, 20 and, 30%, followed by heat treatment at 400ฐC and 600ฐC for 3600 s, respectively. A Differential Scanning Calorimeter (DSC) was used to detect transformation temperatures. Mechanical properties were evaluated by micro hardness and three-point bending tests. The results showed that transformation temperatures were strongly increased with increasing Ni-content. Moreover, the decrease in transformation temperature after increasing level of cold-rolling reduction ratio suggests that internal stress can depress transformation. However, internal stress seemed to support the introduction of superelasticity for each specimen. In addition, specimens heat treated at 400ฐC have more appropriate properties as orthodontic wires than those heat-treated at 600ฐC due to the remaining effect of cold-working. These results can be take into consideration for optimizing alloy composition and mechanical properties of TiNiCu shape memory alloys for orthodontics wires purposes. ฉ (2011) Trans Tech Publications.

Keywords

Cu addition, Orthodontics wire, TiNi