title: [Experimental study of recovery force of surface-modified TiNi memory alloy rod].
abstract: The recovery force of Ti-Nb coated and uncoated TiNi shape memory alloy rods was investigated. The rods were 6.0 mm, 6.5 mm and 7.0 mm in diameter respectively. The mean transition temperature was 33.0 degrees C. The rods were stored at -18 degrees C and pre-bent with a three-point bending fixture, the span was 20. 0 centimeters and the deflections were 5.0 mm, 10.0 mm, 15.0 mm and 20.0 mm, respectively. The rods were then heated in a constant temperature saline solution chamber. The experimental temperature was 37.0 C and 50.0 C respectively. The recovery force was measured in a constant displacement mode on biomaterial test machine. The results showed that the recovery force of the memory alloy rod increased with increasing recovery temperature, rod diameter and deformation of both Ti-Nb coated and uncoated surface. The recovery force of Ti-Nb coated rods of 6.0 and 6.5 millimeter in diameter was lower than the uncoated rods in the same diameter. However, the recovery force of 7.0-mm-diameter rods showed no significant difference between coated and uncoated surface.
authors.affiliation: The Institute of Orthopedics, General Hospital of Chinese PLA, Beijing 100853, China. wangaiyuan301@sohu.com
authors.forename: Aiyuan
authors.initials: A
authors.lastname: Wang
authors.forename: Jiang
authors.initials: J
authors.lastname: Peng
authors.forename: Xian
authors.initials: X
authors.lastname: Zhang
authors.forename: Wenjin
authors.initials: W
authors.lastname: Xu
authors.forename: Xing
authors.initials: X
authors.lastname: Wang
authors.forename: Minxue
authors.initials: M
authors.lastname: Sun
authors.forename: Shibi
authors.initials: S
authors.lastname: Lu
mesh_terms: D000497:Alloys / Q000737:chemistry; D001696:Biomechanical Phenomena; D020099:Coated Materials, Biocompatible; D009556:Niobium; D013696:Temperature; D014025:Titanium
chemical_list: D000497:Alloys; D020099:Coated Materials, Biocompatible; D009556:Niobium; D014025:Titanium