Abstract: A metastable ? titanium alloy is provided, which includes, by weight percent, 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, said alloy having a crystallographic structure containing: a mix of austenitic phase and alpha phase; and a presence of omega phase precipitates the volume fraction of which is less than 10%. Also provided is a timepiece spring made from such an alloy and a method for producing such a spring.

Abstract: A non-magnetic part including an austenitic alloy, the austenitic alloy including between 50 and 85 wt % of iron, one or more gammagene elements the weight percentage or the total weight percentages of which amount to between 15 and 35 wt %, and less than 2 wt % of nitrogen. The austenitic alloy has a crystallographic structure including a predominantly cubic crystal structure and the presence of a hexagonal crystal structure. The magnetic part includes a hardness gradient in the direction extending radially from the surface of the at least one portion of the non-magnetic part to the inside of the non-magnetic part, the hardness gradient having a value greater than or equal to 100 HV.

Abstract: The present invention relates to a composite material with a graded or homogeneous matrix, the production method thereof, and the uses of same.

Abstract: A metastable ? titanium alloy is provided, which includes, by weight percent, 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, said alloy having a crystallographic structure containing: a mix of austenitic phase and alpha phase; and a presence of omega phase precipitates the volume fraction of which is less than 10%. Also provided is a timepiece spring made from such an alloy and a method for producing such a spring.

Abstract: According to a thermomechanical treatment process for a titanium alloy including between 23 and 27% niobium in atomic proportion, between 0 and 10% zirconium, and between 0 and 1% oxygen, nitrogen and/or silicon, the following steps are performed: a) an increase of a sample of the alloy to a temperature higher than 900° C., b) a fast quench, c) a severe cold strain, d) an ageing treatment at a temperature included between 200 and 600° C., the time of the ageing treatment being included between 10 seconds and 10 minutes. Alloy obtained by this process and prostheses made from such an alloy.

Abstract: According to a thermomechanical treatment process for a titanium alloy including between 23 and 27% niobium in atomic proportion, between 0 and 10% zirconium, and between 0 and 1% oxygen, nitrogen and/or silicon, the following steps are performed: a) an increase of a sample of the alloy to a temperature higher than 900° C., b) a fast quench, c) a severe cold strain, d) an ageing treatment at a temperature included between 200 and 600° C., the time of the ageing treatment being included between 10 seconds and 10 minutes. Alloy obtained by this process and prostheses made from such an alloy.