High extrusion ratio titanium metal matrix composites
Disclosed herein are extruded titanium metal matrix composites with enhanced ductility. Also disclosed is the extrusion at high extrusion ratio of titanium metal matrix composites produced by powder metal processes. The ductility and machinability of these titanium metal matrix composites extruded at high extrusion ratios combined with their wear resistance and excellent imaging characteristics makes these high extrusion ratio extruded titanium metal matrix composites useful as biological implants, including prosthetic devices. Also disclosed are articles such as orthopedic implants for knee, hip, spine or other biomedical devices, with enhanced properties, made from the disclosed extruded material.
1. An extruded titanium metal matrix composite material, said matrix composite comprising a titanium or titanium alloy matrix, tungsten, and at least one discontinuous reinforcing material, wherein said at least one discontinuous reinforcing material comprises ceramic particles selected from the group consisting of TiC, TiB, and TiB 2 , said ceramic particles having a surface directly in contact with said matrix; and further wherein
an extrusion ratio of said matrix composite is greater than 9, and
the ductility of said matrix composite is greater than 3% elongation.
2. The material of claim 1 , wherein the titanium or titanium alloy matrix comprises at least one material chosen from alpha, alpha-beta, and beta titanium alloys, and unalloyed Ti.
3. The material of claim 2 , wherein the alloys are chosen from Ti-6Al-4V, and Ti-6Al-7Nb.
4. The material of claim 1 , wherein said extrusion ratio is greater than 20 to 1.
5. An article comprising the material of claim 1 , wherein said article is an orthopedic device chosen from knee, hip, spine and shoulder, implants, and dental implants.
6. The article of claim 5 , wherein the titanium or titanium alloy matrix comprises at least one material chosen from alpha, alpha-beta, and beta titanium alloys, and unalloyed Ti.
7. The article of claim 6 , wherein the alloys are chosen from Ti-6Al-4V, and Ti-6Al-7Nb.
8. An orthopedic device comprising titanium metal matrix composite, said matrix composite comprising a titanium or titanium alloy matrix and at least one discontinuous reinforcing material, wherein
said at least one discontinuous reinforcing material comprises ceramic particles selected from the group consisting of TiC, TiB, and TiB 2 , said particles having a surface directly in contact with said matrix; and
said matrix composite is extruded at an extrusion ratio greater than 9 from consolidated powder metal to form an extruded composite, wherein said extruded composite has a ductility of at least 3% elongation.
9. The orthopedic device of claim 8 , wherein the titanium or titanium alloy matrix comprises at least one material chosen from alpha, alpha-beta, and beta titanium alloys, and unalloyed Ti.
10. The orthopedic device of claim 9 , wherein the alloys are chosen from Ti-6Al-4V, and Ti-6Al-7Nb.
11. The orthopedic device of claim 8 , wherein the matrix composite contains W.
12. The orthopedic device of claim 8 , wherein the extrusion ratio is greater than 20 to 1.
13. A powder metallurgy method of making an extruded titanium metal matrix composite material having ductility of greater than 3% elongation, said method comprising:
forming a blended powder by blending at least one matrix powder comprising titanium or a titanium alloy with tungsten, and at least one discontinuous reinforcing powder comprising ceramic particles selected from the group consisting of TiC, TiB, and TiB 2 ;
compacting the blended powder;
heat treating the compacted and blended powder at a time and temperature sufficient to form a consolidated powder metal comprising a titanium or titanium alloy matrix, and a discontinuous ceramic reinforcement having a surface in direct contact with said titanium or titanium alloy matrix; and
extruding the consolidated powder metal at a extrusion ratio greater than 9 to 1.