title: Study of thermomechanical treatment on mechanical-induced phase transformation of NiTi and TiNiCu wires.
abstract: The nickel-titanium shape memory alloys have been used in orthodontic application due to their unique properties like superelasticity and biocompatibility. The phase transformation behavior of these alloys can be changed by alloying elements and thermomechanical processing conditions. In this study, two types of NiTi and TiNiCu wires of 0.4mm diameter were produced via thermomechanical treatments with final step of 20% cold drawing followed by annealing at different temperatures of 300 and 400 °C for varying times of 10, 30 and 60 min. The processed wires were characterized by oral cavity configuration three point bending (OCTPB) test at 37 °C to specify the mechanical transformation features. Also, differential scanning calorimetry (DSC) was used to analyze the thermal transformation temperatures of selected wires. The results showed the thermomechanical treatment at 300 °C for 30 min was the suitable process in terms of superelasticity and transformation temperatures for orthodontic application.
authors: School of Metallurgy and Materials Engineering, University College of Engineering, University of Tehran, Tehran 14395-731, Iran.
authors: S M
authors: SM
authors: Seyyed Aghamiri
authors: M
authors: M
authors: Nili Ahmadabadi
authors: H
authors: H
authors: Shahmir
authors: F
authors: F
authors: Naghdi
authors: Sh
authors: Sh
authors: Raygan
mesh_terms: D003300:Copper / Q000737:chemistry*; D055119:Elastic Modulus; D019544:Equipment Failure Analysis; D006358:Hot Temperature; D008422:Materials Testing; D009532:Nickel / Q000737:chemistry*; D009969:Orthodontic Wires; D044367:Phase Transition; D011474:Prosthesis Design; D013314:Stress, Mechanical; D013718:Tensile Strength; D014025:Titanium / Q000737:chemistry*
chemical_list: C415948:Copper NiTi; C040654:titanium nickelide; D003300:Copper; D009532:Nickel; D014025:Titanium