U.S. patent application number 11/579642 was filed with the patent office on 2008-03-20 for titanium-aluminum alloy.
This patent application is currently assigned to G4T GmbH. Invention is credited to Manfred Renkel, Wilfried Smarsly.
Application Number | 20080069720 11/579642 |
Document ID | / |
Family ID | 34969012 |
Filed Date | 2008-03-20 |
United States Patent
Application |
20080069720 |
Kind Code |
A1 |
Renkel; Manfred ; et
al. |
March 20, 2008 |
Titanium-Aluminum Alloy
Abstract
The invention relates to a titanium/aluminium alloy with an
alloy composed of titanium, aluminium and niobium, with an
aluminium content of between 35 and 60 wt. %. The alloy can further
contain 1-100 ppm chlorine and/or fluorine and 0.01-1.0 wt. % gold
and/or silver. The invention further relates to a lightweight
component made from a titanium/aluminium alloy and the use of a
titanium/aluminium alloy for the production of a homogeneous,
fine-grain, precursor by means of a spin casting method.
Inventors: |
Renkel; Manfred;
(Wiesenthau, DE) ; Smarsly; Wilfried; (Munich,
DE) |
Correspondence
Address: |
KANESAKA BERNER AND PARTNERS LLP
1700 DIAGONAL RD
SUITE 310
ALEXANDRIA
VA
22314-2848
US
|
Assignee: |
G4T GmbH
Altreuthstr. 18,
Pretzfeld
DE
91362
|
Family ID: |
34969012 |
Appl. No.: |
11/579642 |
Filed: |
May 2, 2005 |
PCT Filed: |
May 2, 2005 |
PCT NO: |
PCT/DE2005/00809 |
371 Date: |
January 18, 2007 |
Current U.S.
Class: |
420/418 ;
420/580 |
Current CPC
Class: |
C22C 14/00 20130101 |
Class at
Publication: |
420/418 ;
420/580 |
International
Class: |
C22C 14/00 20060101
C22C014/00; C22C 30/00 20060101 C22C030/00 |
Foreign Application Data
Date |
Code |
Application Number |
May 7, 2004 |
DE |
10 2004 022 578.8 |
Claims
1. Titanium-aluminum alloy with an alloy composition of titanium,
aluminum and niobium, characterized in that the aluminum content of
the alloy is between 35 and 60% in weight.
2. Titanium-aluminum alloy according to claim 1, characterized in
that the aluminum content of the alloy is between 43 and 45% in
weight.
3. Titanium-aluminum alloy according to claim 1 or 2, characterized
in that the niobium content of the alloy is between 2 and 16% in
weight.
4. Titanium-aluminum alloy according to claim 3, characterized in
that the niobium content of the alloy is between 6 and 12% in
weight.
5. Titanium-aluminum alloy according to one of the preceding
claims, characterized in that the alloy contains at least one
halogen.
6. Titanium-aluminum alloy according to one of the preceding
claims, characterized in that the alloy contains chlorine and/or
fluorine.
7. Titanium-aluminum alloy according to claim 6, characterized in
that the chlorine content and/or fluorine content is between 1 and
100 ppm.
8. Titanium-aluminum alloy according to claim 7, characterized in
that the chlorine content and/or fluorine content is between 2 and
10 ppm.
9. Titanium-aluminum alloy according to one of the preceding
claims, characterized in that the alloy contains gold and/or
silver.
10. Titanium-aluminum alloy according to claim 9, characterized in
that the gold content and/or silver content is between 0.01 and
2.0% in weight.
11. Titanium-aluminum alloy according to claim 10, characterized in
that the gold content and/or silver content is between 0.01 and
1.0% in weight.
12. Lightweight component made of a titanium-aluminum alloy
according to one of the preceding claims.
13. Use of a titanium-aluminum alloy according to claims 1 to 11
for the production of a homogeneous, fine-grained precursor
material via a centrifugal casting method.
Description
[0001] The present invention relates to a titanium-aluminum alloy
with an alloy composition of titanium, aluminum and niobium. The
invention further relates to a lightweight component made of a
titanium-aluminum alloy and the use of a titanium-aluminum alloy
for the production of a homogenous, fine-grained precursor material
via a centrifugal casting method.
[0002] Alloy compositions of titanium, aluminum and niobium are
known. Such alloys are used in particular for the production of
high-temperature-resistant lightweight components which, on the one
hand, have a very low weight and which, on the other hand, must
have a high degree of strength. DE 197 35 841 A1 describes an alloy
based on titanium aluminides with an alloy composition of titanium,
aluminum and niobium. The portion of niobium can vary in the known
alloy, namely between 5 and 10 atom-%. In this connection the
disclosed alloys always have a portion of 45 atom-% of aluminum.
This corresponds to an aluminum portion between 28 and 30% in
weight. DE 200 19 886 U1 also describes an alloy based on the
production of titanium aluminides using melting and powder
metallurgic techniques with an alloy composition of titanium,
aluminum and niobium, wherein the aluminum content of the alloy is
between 45.5 and 49 atom-%. The niobium content in this known alloy
can be between 4 and 10 atom-%. This alloy also has an aluminum
portion between 28 and 30% in weight. A niobium-modified
titanium-aluminum alloy is known from DE 40 37 959 A1 which alloy
substantially consists of titanium, aluminum and niobium, wherein
the alloys have 37 to 48 atom-% of titanium, 46 to 49 atom-% of
aluminum and 6 to 14 atom-% of niobium. This corresponds to a
composition of the alloy of 54 to 36.5% in weight of titanium, 30%
in weight of aluminum and 6.5 to 16% in weight of niobium. Finally
an alloy composition of titanium, aluminum and niobium is known
from U.S. Pat. No. 4,294,615 which alloy composition consists of
58.8% in weight of titanium, 29.8% in weight of aluminum and 11.4%
in weight of niobium.
[0003] However, the disadvantage of these known alloys of titanium
and aluminum is their low temperature resistance with regard to
creeping, fatigue and oxidation resistance. In addition, due to
their brittleness, the known alloys are particularly difficult to
process, in particular processing procedures such as casting or
forging.
[0004] It is thus an object of this invention to provide a
titanium-aluminum alloy with an alloy composition of titanium,
aluminum and niobium which does not have these disadvantages, i.e.,
an alloy which has a high temperature resistance regarding
creeping, fatigue, i.e., strength and oxidation resistance.
[0005] Furthermore it is an object of this invention to provide
lightweight components which have the mentioned high temperature
resistance.
[0006] These objects are solved by a titanium-aluminum alloy
according to the features of claim 1 and a lightweight component
according to the features of claim 11.
[0007] Advantageous embodiments of the titanium-aluminum alloy
according to the invention are described in the dependent
claims.
[0008] A titanium-aluminum alloy according to the invention with an
alloy composition of titanium, aluminum and niobium has an aluminum
content between 35 and 60% in weight. The advantage of the alloy
according to the invention is that the higher portions of aluminum
in comparison to the previously known alloy compositions of
titanium, aluminum and niobium achieve an unexpectedly high degree
of strength and/or temperature resistance with regard to creeping,
fatigue and a corresponding oxidation resistance. In an
advantageous embodiment the aluminum content of the alloy is
between 43 and 45% in weight. Advantageously the niobium content of
the alloy is between 2 and 16% in weight, preferably between 6 and
12% in weight.
[0009] In a further advantageous embodiment of the
titanium-aluminum alloy according to the invention the alloy
contains at least one halogen, in particular portions of chlorine
and/or fluorine. The addition of chlorine and/or fluorine
advantageously leads to a higher oxidation resistance of the alloy.
In this connection the chlorine content and/or fluorine content is
between 1 and 100 ppm, preferably between 2 and 10 ppm.
[0010] In a further advantageous embodiment the titanium-aluminum
alloy according to the invention contains these portions of gold
and/or silver. The addition of gold and/or silver also leads to a
higher oxidation resistance of the alloy. In this connection the
gold content and/or silver content is between 0.01 and 2.0% in
weight, preferably between 0.01 and 1.0% in weight.
[0011] With the described titanium-aluminum alloys according to the
invention an increased strength to 400 to 600 MPa/R.T. at
800.degree. C. can be achieved. The oxidation resistance for
800.degree. C. is 10,000 hours. In addition the alloys according to
the invention can be processed very well, i.e. crack-free extruding
and forging, segregation-free melting and casting are possible.
[0012] Lightweight components made from a titanium-aluminum alloy
according to the previously described compositions also have a high
temperature resistance, in particular regarding fatigue and
oxidation resistance, as well as a high degree of strength.
[0013] A titanium-aluminum alloy according to the invention
according to the previously described exemplary compositions can be
used to produce a homogeneous, fine-grained, precursor material via
a centrifugal casting procedure. This is made possible by the very
good processability of the alloy compositions according to the
invention.
* * * * *