Ni-Ti semi-finished products and related methods
View Patent ↗Semi-finished products for the production of devices containing thermoelastic materials with improved reliability and reproducibility are described. The semi-finished products are based on an alloy of Ni—Ti plus elements X and/or Y. The nickel amount is comprised between 40 and 52 atom %, X is comprised between 0.1 and 1 atom %, Y is comprised between 1 and 10 atom % and the balance is titanium. The one or more additional elements X are chosen from Al, Ta, Hf, Si, Ca, Ce, La, Re, Nb, V, W, Y, Zr, Mo, and B. The one or more additional elements Y are chosen from Al, Ag, Au, Co, Cr, Fe, Mn, Mo, Nb, Pd, Pt, Ta and W.
1. A semi-finished product comprising:
a nickel-titanium alloy and an amount X of one or more additional elements, wherein:
nickel amount is comprised between 40 and 52 atom %, the amount X is comprised between 0.1 and 1 atom %, the balance being titanium;
the one or more additional elements are selected from Al, B, Ca, Ce, Hf, La, Mo, Nb, Re, Si, Ta, V, W, Y and Zr; and
the amount X and the one or more additional elements are selected to result in variation of the amount X over different points of the semi-finished product being less than 20%.
2. The semi-finished product of claim 1 , wherein:
the amount X is comprised between 0.1 and 0.5 atom %.
3. The semi-finished product of claim 2 , wherein:
the amount X is comprised between 0.1 and 0.25 atom %.
4. The semi-finished product of claim 1 , wherein:
the one or more additional elements are selected from Al, B, Ca, La, Re, Si, W, Y, and Zr; and the atom % for each of the one or more additional elements is comprised between 0.1 and 0.5 atom %.
5. The semi-finished product of claim 1 , wherein:
the one or more additional elements are selected from Hf, Mo, Nb, Si, Ta, and V.
6. The semi-finished product of claim 1 , said semi-finished product being a wire-shaped product.
7. The semi-finished product of claim 1 , said semi-finished product being a tube-shaped product.
8. The semi-finished product of claim 1 , said semi-finished product being a rod-shaped product.
9. The semi-finished product of claim 1 , said semi-finished product being a metal sheet-shaped product.
10. A finished product obtained through the semi-finished product according to claim 1 .
11. The finished product of claim 10 , wherein the finished product is obtained by cutting the semi finished product.
12. A method of using the semi-finished product of claim 1 to determine the variation of the amount X over different points of the semi-finished product, comprising:
sampling points along a length of the semi-finished product at a set distance between points; and
for each point, measuring the amount X.
13. A method of using a semi-finished product, the semi-finished product comprising:
a nickel-titanium alloy and an amount X of one or more additional elements, wherein:
nickel amount is comprised between 40 and 52 atom %, the amount X is comprised between 0.1 and 1 atom %, the balance being titanium;
the one or more additional elements are selected from Al, B, Ca, Ce, Hf, La, Mo, Nb, Re, Si, Ta, V, W, Y and Zr; and
the amount X and the one or more additional elements are selected to result in variation of the amount X over different points of the semi-finished product being less than a set percentage,
the method being for determining the variation of the amount X over different points of the semi-finished product, the method comprising:
sampling points along a length of the semi-finished product at a set distance between points; and
for each point, measuring the amount X.