US 11,913,106 B2
Metastable ß titanium alloy, timepiece spring made from such an alloy and method for production thereof
Pascal Laheurte, Forbach (FR); Pierre Charbonnier, Metz (FR); and Laurent Peltier, Nouilly (FR)
Assigned to SAS INNO TECH CONSEILS, Maîche (FR)
Appl. No. 16/497,327
Filed by SAS INNO TECH CONSEILS, Maîche (FR)
PCT Filed Mar. 14, 2018, PCT No. PCT/EP2018/056440
§ 371(c)(1), (2) Date Sep. 24, 2019,
PCT Pub. No. WO2018/172164, PCT Pub. Date Sep. 27, 2018.
Claims priority of application No. 1752503 (FR), filed on Mar. 24, 2017.
Prior Publication US 2020/0308685 A1, Oct. 1, 2020
Int. Cl. C22F 1/18 (2006.01); C22C 14/00 (2006.01); G04B 17/06 (2006.01)
CPC C22F 1/183 (2013.01) [C22C 14/00 (2013.01); G04B 17/066 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A metastable β titanium alloy comprising as a percentage by weight, between 24 and 45% niobium, between 0 and 20% zirconium, between 0 and 10% tantalum and/or between 0 and 1.5% silicon and/or less than 2% oxygen, the alloy having a crystallographic structure comprising:
a mixture of austenitic phase and alpha phase; and
the presence of omega-phase precipitates the volumetric concentration of which is greater than 0% and less than 10%, and said alloy alpha phase has a volumetric concentration comprised between 1 and 40%, and each grain of the alloy having a grain size that is less than 1 μm.