Lamellar-structure titanium-aluminum based alloy having a beta-gamma phase

Inactive Publication Date: 2015-11-12
KOREA INST OF MASCH & MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0019]According to the present invention, stabilization of a beta phase is maximized by adding tungsten (W) and chromium (Cr) that are inexpensive elements instead of molybdenum (Mo) and vanadium (V) that are usually added to stabilize a beta phase.
[0020]Further, mechanical properties are improv

Problems solved by technology

The titanium-aluminum (TiAl) lamellar structure has been known as providing properties that are useful for the practical use of titanium-aluminum (TiAl) as a light high-temperature material, because it has high fract

Method used

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  • Lamellar-structure titanium-aluminum based alloy having a beta-gamma phase

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Example

[0052]In contrast, it was seen that the specimen of the comparative example had hardness of 268.4 Hv, considerably lower than those of the embodiments of the present invention.

[0053]Finally, FIG. 9 is a graph comparing the result of tensile test on the lamellar titanium-aluminum (TiAl) alloys having a beta-gamma phase according to the second and third embodiments of the present invention and a comparative example. As the result of performing a tensile test on #7 of the second embodiment, #11 of the third embodiment, and the comparative example, they showed Young's modulus of 180˜220 GPa.

[0054]The test results correspond to the first to third embodiments manufactured by performing solid-casting on the titanium-aluminum (TiAl) alloy having the composition shown in FIG. 2, without post processes such as heat treatment and plastic working performed.

[0055]Accordingly, Young's modulus, hardness, and tensile strength can be further improved if post processes are additionally performed. Fur...

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Abstract

A lamellar titanium-aluminium (TiAl) alloy having a beta-gamma phase according to the present invention contains aluminum (Al) of 40˜46 at %, niobium (Nb) of 3˜6 at %, a creep resistance enhancer of 0.2˜0.4 at %, a softening resistance enhancer of 2 at %, and the balance of titanium (Ti) and is manufactured by vacuum arc melting.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a lamellar titanium-aluminum (TiAl) based alloy having a beta-gamma phase, and more particularly, to a lamellar titanium-aluminum (TiAl) alloy having a beta-gamma phase of which the effect of stabilizing a beta phase is improved and the manufacturing cost is reduced, by adding tungsten (W) and chromium (Cr) that are not expensive instead of molybdenum (Mo) and vanadium (V) that are usually added to stabilize a beta phase.[0003]The present invention relates to a lamellar titanium-aluminum (TiAl) alloy having a beta-gamma phase of which mechanical properties are improved by adding a small amount of carbon (C) and silicon (Si) that are effective in grain refinement and creep resistance to suppress production of a deposit and of which high-temperature oxidation resistance and ductility are improved by adding niobium (Nb).[0004]2. Description of the Related Art[0005]A titanium-aluminum (TiAl)...

Claims

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Application Information

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IPC IPC(8): C22C14/00
CPCC22C14/00C22C1/02
Inventor KIM, SEONG WOONGNA, YOUNG SANGKIM, SEUNG EONYEOM, JONG TAEK
Owner KOREA INST OF MASCH & MATERIALS
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