Beta type gamma-TiAl alloy and preparation method thereof
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A technology for alloys and master alloys, applied in the field of TiAl alloys and their preparation, can solve the problems of insufficient high-temperature deformation ability and oxidation resistance of TiAl-based alloys, achieve excellent oxidation resistance, realize industrial production, and have simple preparation methods
Inactive Publication Date: 2010-11-10
HARBIN INST OF TECH
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[0003] The purpose of the present invention is to solve the problem of insufficient high-temperature deformability and oxidation resistance of existing TiAl-based alloys. The present invention provides a β-type γ-TiAl alloy and its preparation method
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specific Embodiment approach 1
[0012] Specific Embodiment 1: In this embodiment, the β-type γ-TiAl alloy contains 41% to 46% of Al, 9% of V and Nb, 0% to 0.3% of Y and the balance of Ti in terms of atomic percentage, wherein V The ratio x to the atomic percent content of Nb=0.5-5.
[0013] The nominal chemical composition of the β-type γ-TiAl alloy of this embodiment is Ti-(41-46)Al-(9~9.3)(V, Nb, Y) (at.%), mainly containing γ-TiAl, α 2 -Ti 3 Al and β(B2) phases. Adding an appropriate amount of Y element in the present invention can significantly refine the grain and layer spacing of the TiAl alloy, and at the same time control the reasonable ratio of V and Nb content (x=0.5~5), so that the β-type γ-TiAl alloy has a good Mechanical properties and high temperature deformability.
[0014] The atomic percentage of Nb in the β-type γ-TiAl alloy of this embodiment is 1.5%-6%, and the atomic percentage of V is 9%-Nb% (atomic percentage of Nb).
[0015] The X-ray diffraction spectrum of the β-type γ-TiAl allo...
specific Embodiment approach 2
[0016] Embodiment 2: This embodiment differs from Embodiment 1 in that the β-type γ-TiAl alloy contains 41% to 46% of Al, 9% of V and Nb, and the balance of Ti. Other parameters are the same as in the first embodiment.
[0017] The nominal chemical composition of the β-type γ-TiAl alloy of this embodiment is Ti-(41-46)Al-9(V, Nb) (at.%).
specific Embodiment approach 3
[0018] Embodiment 3: This embodiment differs from Embodiment 1 in that the β-type γ-TiAl alloy contains 43% to 46% of Al, 9% of V and Nb, and the balance of Ti. Other parameters are the same as in the first embodiment.
[0019] The nominal chemical composition of the β-type γ-TiAl alloy of the present embodiment is Ti-(43-46)Al-9(V,Nb)(at.%).
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Abstract
The invention discloses a beta type gamma-TiAl alloy and a preparation method, relates to a TiAl alloy and a preparation method thereof and solves the problems of the high-temperature deformability and poor oxidation resistance of the traditional TiAl alloy. The beta type gamma-TiAl alloy comprises the following components in percentage by atom: 41-46 percent of Al, 9 percent of V and Nb, 0-0.3 percent of Y and the balance of Ti, wherein the specific value x of the V and the Nb is 0.5-5. The preparation method comprises the following steps: weighting raw materials of spongy titanium, high-purity aluminum, an aluminum-niobium intermediate alloy, an aluminum-vanadium alloy and an aluminum-yttrium alloy; and placing the raw materials into a water-cooled copper crucible vacuum medium frequency induction melting furnace for melting. By controlling the proportion of the V to the Nb, the beta type gamma-TiAl alloy with favorable high-temperature deformability and the oxidation resistance can be obtained and the forged surface has no crack phenomenon; and the weight is added by 25mg / cm<2> after circulating oxidation at 800DEG C for 80h, which is ten times of the oxidation resistance of a Ti-43Al-9V-0.3Y alloy. The preparation method is simple.
Description
technical field [0001] The invention relates to a TiAl alloy and a preparation method thereof. Background technique [0002] Due to its low density, high elastic modulus, high specific strength, high high temperature strength, good creep resistance and excellent corrosion resistance, TiAl-based alloys are considered to be very promising light-weight and high-temperature resistant structures. Materials, can be used in aerospace, marine ships, medical and health and other fields. However, the shortcomings of TiAl alloys such as low room temperature plasticity, poor high temperature deformation ability, difficult hot processing, and poor oxidation resistance at 750 °C limit its wide application. With the development of TiAl alloy towards high temperature and high performance, Nb element has become an essential additive element in TiAl alloy, which can improve the strength and oxidation resistance of TiAl alloy. However, the deformability of TiAl alloys decreases significantly...
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