Nickel-titanium Alloys, related products and methods
View Patent ↗Ni-Ti (nickel-titanium) based alloys. and related semi-finished products and methods are described, where the nickel content is comprised between 50.7 and 52.0 atomic % .
1. A Ni-Ti alloy containing: between 55.75 and 57.0 wt % nickel, between 0.005 and 0.0220 wt % carbon, between 0.0001 and 0.0050 wt % nitrogen, between 0.0001 and 0.01 wt % aluminum, between 0.0001 and 0.01 wt % silicon, and between 0.0005 and 0.0220 wt % oxygen, the balance being titanium, wherein the maximum size of inclusions of the alloy is 20 microns and the maximum area fraction of the inclusions is 1%.
2. The Ni-Ti alloy according to claim 1 , wherein aluminum is comprised between 0.001 and 0.01 wt %.
3. The Ni-Ti alloy according to claim 1 , wherein silicon is comprised between 0.0003 and 0.01 wt %.
4. The Ni-Ti alloy according to claim 1 , wherein oxygen is comprised between 0.005 and 0.0220 wt %.
5. The Ni-Ti alloy according to claim 1 , wherein the maximum size of the inclusions is 12.5 microns and the maximum area fraction of the inclusions is below 0.5%.
6. The Ni-Ti alloy according to claim 1 , wherein the sum of silicon, aluminum and oxygen is below 0.042 wt %.
7. The Ni-Ti improved alloy according to claim 6 , wherein the sum of silicon, aluminum and oxygen is below 0.03 wt %.
8. A semifinished product comprising the Ni-Ti alloy according to claim 1 .
9. The semifinished product according to claim 8 , wherein said semifinished product is a tube.
10. The semifinished product according to claim 8 , wherein said semifinished product is a wire.
11. The semifinished product according to claim 8 , wherein said semifinished product is a rod.
12. The semifinished product according to claim 8 , wherein said semifinished product is a bar.
13. The semifinished product according to claim 8 , wherein said semifinished product is a sheet.
14. A Ni-Ti alloy containing:
between 55.75 and 57.0 wt % nickel, between 0.005 and 0.0220 wt % carbon, between 0.0001 and 0.01 wt % aluminum, between 0.0001 and 0.01 wt % silicon, nitrogen and oxygen, the balance being titanium, wherein wt % of oxygen is four to five times wt % of nitrogen and wherein the maximum size of inclusions of the alloy is 20 microns and the maximum area fraction of the inclusions is 1%.
15. A semi-finished product comprising the Ni-Ti alloy of claim 14 .