Titanium tungsten alloys produced by additions of tungsten nanopowder

a technology of tungsten nanopowder and alloys, which is applied in the field of titanium tungsten alloys and composites, can solve the problems of poor mechanical properties in the final product, inability to commercialize, and difficult preparation of alloys by typical techniques,

Inactive Publication Date: 2005-12-08
DYNAMET TECH
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  • Abstract
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  • Application Information

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Benefits of technology

[0015] The properties of Ti metal matrix composites containing particulate reinforcement of titanium carbide (TiC), titanium boride (TiB)...

Problems solved by technology

While Ti alloys strengthened by W are generally desirable because they are strong wear resistant alloys, such alloys are difficult, if not impossible, to prepare by typical techniques.
These resulting defects lead to poor mechanical properties in the final p...

Method used

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  • Titanium tungsten alloys produced by additions of tungsten nanopowder
  • Titanium tungsten alloys produced by additions of tungsten nanopowder

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[0038] A powder metallurgy technique was used to produce a tungsten containing titanium alloy. Using this method, beta phase island dispersions were created in CP Ti and in Ti-6Al-4V with 10% by weight W. In this example, nanopowder 30 to 45 nanometers (0.003 to 0.004 μm) in size with a specific surface area of between 7 to 10 m2 / g was blended with CP Ti powder and processed as described above. These W nanopowders were also blended with CP Ti and master alloy powders to form the Ti-6Al-4V composition shown in Table 1.

[0039] The W nanopowder was taken into solution in the Ti matrix on sintering the compacted blend, forming an alpha / beta structure with a uniform beta phase island dispersion.

[0040]FIG. 1 shows that the W nanopowder completely diffused to form a beta phase island dispersion in the alpha / beta matrix. The diffusion of the W nanopowder transformed the all alpha microstructure typical of CP Ti to alpha / beta containing a dispersion of beta phase islands. In this case there...

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Abstract

Disclosed herein are titanium-tungsten alloys and composites wherein the tungsten comprises 0.5% to 40% by weight of the alloy. Also disclosed is a method of making such alloys and composites using powders of tungsten less then 3 μm in size, such as 1 μm or less. Also disclosed is a method of making the titanium alloy by powder metallurgy, and products made from such alloys or billets that may be cast, forged, or extruded. These methods of production can be used to make titanium alloys comprising other slow-diffusing beta stabilizers, such as but not limited to V, Nb, Mo, and Ta.

Description

[0001] This application claims the benefit of domestic priority to U.S. Provisional Patent Application Ser. No. 60 / 563,009, filed Apr. 19, 2004, which is herein incorporated by reference in its entirety.[0002] Disclosed herein are titanium-tungsten alloys and composites. Also disclosed is a method of making such alloys and composites using nanopowders of tungsten and optionally comprising slow-diffusing beta stabilizers, such as but not limited to V, Nb, Mo, and Ta. [0003] While Ti alloys strengthened by W are generally desirable because they are strong wear resistant alloys, such alloys are difficult, if not impossible, to prepare by typical techniques. For example, in a casting process, W generally completely dissolves in the molten Ti during the melting step. As the resulting ingot solidifies beta-rich large, elongated islands form between the dendrites of the solidified casting. These resulting defects lead to poor mechanical properties in the final product. [0004] Until the pre...

Claims

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Application Information

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IPC IPC(8): B22F1/12B22F3/24C22C1/04C22C14/00C22C32/00
CPCB22F1/0003B22F2998/00B22F2998/10C22C1/0458C22C14/00B22F3/12C22C32/0047C22C27/04B22F3/17B22F3/20B22F3/22B22F5/007B22F3/02B22F3/10B22F3/15A61L27/06A61L31/022B22F1/12
Inventor ABKOWITZ, STANLEYABKOWITZ, SUSAN M.FISHER, HARVEYSCHWARTZ, PATRICIA J.
Owner DYNAMET TECH
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