Compagnie Europeenne Du Zirconium Cezus

Nogitek

Memometal Industries

Bernard Prandi

Edouard Alheritiere

Alain Dubertret

Loic Giquel

Jacques Magnan

Bernard Champin

A middle prosthesis including an element comprising an arched section defining first and second branches which are spaced from one another and are movable relative to one another by the elasticity of the element and wherein the element is formed of a superelastic metal alloy.

Middle ear prosthesis

A process for the production of a superelastic material out of a nickel and titanium alloy, characterized by the fact that it consists in obtaining an ingot starting from a mixing of nickel and titanium consisting in 55.6%.+-.0.4% in weight of nickel and to proceed with a thermal treatment of martensite plaquettes generation by subjecting said ingot during 5 to 45 minutes to a temperature comprised between 480 and 520.degree. C. The process allows the obtaining of a truly superelastic material at room temperature.

Process for the production of a superelastic material out of a nickel

A titanium alloy part having a structure comprising ex-beta acicular grains and with equi-axial alpha phases gathered in a plurality of rows at boundaries of the grains. The alloy comprises, by weight, 2 to 5% Mo, 3.5 to 6.5% Al, 1.5 to 2.5% Sn, 1.5 to 4.8% Zr, Fe.ltoreq.1.5%, 4 to 12% Mo+V+Cr, and the balance, titanium and impurities.

Titanium alloy part

A process is disclosed for improving the ductility of shape-memory alloy products based on Ti-Ni involving martensitic transformation. The process comprises at least one thermal treatment cycle of alternating hot and cold treatment, wherein the first thermal treatment cycle comprises a cold treatment at a temperature both lower than -50.degree. C. and lower than M.sub.s -50.degree. C., where M.sub.s is the temperature at which martensitic transformation of the product begins, and a hot treatment of the product at a temperature of 700.degree. to 900.degree. C. Each optional subsequent thermal treatment cycle comprises a cold treatment of the product at a temperature both lower than -50.degree. C. and lower than M.sub.s -30.degree. C., and a hot treatment of the product at a temperature of 600.degree. to 900.degree. C.

Process for improving the ductility of a product of alloy involving

A wrought and heat treated titanium alloy part is disclosed having the composition, by w eight, Al 4.5 to 5.4%, Sn 1.8 to 2.5%, Zr 3.5 to 4.8%, Mo 2.0 to 4.5%, Cr 1.5 to 2.5%, Cr+V 1.5 to 4.5%, Fe 0.7 to 1.5%, O 0.07 to 0.13%, the remainder being Ti and impurities. The part is characterized by a fine and regular alpha-beta structure and essentially segregation free microstructures, and has the mechanical characteristics: Rm.gtoreq.1200 MPa, R.sub.p0.2 .gtoreq.1000 MPa, A%.gtoreq.5, K.sub.1c at 20.degree. C..gtoreq.45 MPa..sqroot.m, creep at 400.degree. C. under 600 MPa:0.5% in more than 200 hours.

Wrought and heat treated titanium alloy part

The process according to the invention comprises the following stages:

Growing community of inventors

Seythenex, France

Bernard Prandi