Age hardening of orthodontic beta titanium alloys

✍ Scribed by Goldberg, A. Jon ;Shastry, C. V.

• Publisher: John Wiley and Sons
• Year: 1984
• Tongue: English
• Weight: 469 KB
• Volume: 18
• Category: Article
• ISSN: 0021-9304
• DOI: 10.1002/jbm.820180206

✦ Synopsis

Metastable beta titanium alloys have been shown to be effective in orthodontic therapy because of their low modulus of elasticity and good springback, forming, and welding characteristics. Although used in the as-drawn condition, these alloys are also age hardenable through precipitation of the alpha phase in the beta matrix. The effect of aging temperature, aging time, and prior cold work on the mechanical properties of fine wires of Ti-13V-1lCr-3AI and Ti-11.5Mo-6Zr-4.5Sn were determined. The latter alloy was more responsive to aging. Aging at 900°F for 14 h produced increases of approximately 40% in the modulus of elasticity, the yield and ultimate strengths. There was a corresponding decrease in ductility. The resulting wires could be useful in clinical situations requiring a high-yield strength and a stiffness intermediate between as-drawn beta titanium and stainless steel, the elastic moduli of which are 10 and 28 x lo6 psi, respectively.