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A kind of nb/high nb-tial layered composite material and preparation method thereof

A layered composite material and alloy technology, which is applied in the direction of layered product processing, metal layered products, chemical instruments and methods, etc., can solve the problems of high cost, difficult processing and forming, and difficult to prepare large-scale plate structural parts, etc. To achieve the effect of improving plastic toughness at room temperature and improving high temperature performance

Active Publication Date: 2021-03-23
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, high Nb-TiAl alloys have low room temperature plasticity and toughness, and their intrinsic brittleness makes it very difficult to process and form them, so it is difficult to prepare thinner plates and other structural parts with complex shapes; using isothermal forging, hot rolling, etc. High Nb-TiAl alloys are processed by various methods, and certain effects have been obtained; however, these methods require high equipment and technology, and the cost is also high

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  • A kind of nb/high nb-tial layered composite material and preparation method thereof
  • A kind of nb/high nb-tial layered composite material and preparation method thereof
  • A kind of nb/high nb-tial layered composite material and preparation method thereof

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specific Embodiment approach 1

[0024] Specific Embodiment 1: This embodiment describes a Nb / high Nb-TiAl layered composite material, the layered composite material is composed of periodic Nb layers and high Nb-TiAl alloy structure, and Nb is a pure Nb layer , the high Nb-TiAl alloy consists of α 2 -Ti 3 Al and γ-TiAl two-phase composition. The two phases can form a full-lamellar structure with consistent sheet orientation, or one of nearly full-lamellar, dual-state, and equiaxed structures. In the present invention, the α 2 -Ti 3 In the two phases of Al and γ-TiAl, a certain amount of alloying element Nb or other alloying elements except Nb can be solid-dissolved, which can improve the high-temperature performance of the high-Nb-TiAl alloy layer. The metallurgical connection between the Nb layer and the high Nb-TiAl layer of the present invention has a very good connection interface. The unique layered structure in the Nb / high Nb-TiAl layered composite can compensate for the lack of intrinsic propertie...

specific Embodiment approach 2

[0025] Embodiment 2: A method for preparing the Nb / high Nb-TiAl layered composite material described in Embodiment 1, the steps of the method are as follows:

[0026] 1. Use alcohol and acetone to ultrasonically clean Ti foil, Al foil and Nb foil respectively (2000W) for 5 to 10 minutes to remove surface oil, and then use 5vol.% to 15vol.% HF, 100vol.% HF and 5vol.% ~15vol.% NaOH solution to clean the surface of Ti foil, Nb foil and Al foil respectively to remove the scale on the surface, and finally clean it with alcohol ultrasonic (2000W) for 2~5min, then dry it with a hair dryer for later use;

[0027] 2. Use magnetron sputtering to plate Nb or Nb-based alloy film (single-sided coating) on ​​the surface of part of the dried Ti foil and Al foil material by magnetron sputtering (single-sided coating). The Ti foil and Al foil are cut to size, and Ti foil and Al foil are alternately stacked to prepare a high Nb-TiAl alloy layer; the length of the Ti foil and Al foil magnetron s...

Embodiment 1

[0041] 1. Use alcohol and acetone to clean the Ti foil, Al foil and Nb foil respectively by ultrasonic (2000W) for 8 minutes to remove the oil on the surface, and then use 10vol.% HF, 100vol.% HF and 10vol.% NaOH solutions to clean the Ti foil , Nb foil, and Al foil for surface cleaning to remove surface oxide skin, and finally use alcohol ultrasonic (2000W) to clean for 5 minutes, and blow dry with a hair dryer for later use. The thickness of the Ti foil is 20 μm, the thickness of the Al foil is 18.5 μm, and the thickness of the Nb foil is 25 μm.

[0042] 2. For the structural design of high Nb-TiAl alloys, the method of magnetron sputtering combined with foil metallurgy is used, that is, the Nb target is firstly prepared; after the Nb target is prepared, magnetron sputtering is used on the surface of some Ti foil and Al foil Carry out magnetron sputtering coating, the thickness of the coating is 2.35-2.5 μm; finally, the Ti foil and Al foil after coating are cut to size and ...

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Abstract

The invention relates to a Nb / high Nb-TiAl layered composite material and a preparation method thereof, belongs to the technical field of alloy preparation, and aims to solve the problems of intrinsicbrittleness, low room temperature plastic toughness, difficulty in processing and forming and uneven diffusion of refractory alloy elements with high melting points such as Nb. The method comprises the following steps of: 1, cleaning the surfaces of a Ti foil, an Al foil and a Nb foil; 2, performing structural design and lamination of a high Nb-TiAl alloy; 3, laminating the washed Nb foil and thedesigned high Nb-TiAl alloy structure to prepare a prefabricated member; 4, performing low temperature heat treatment; 5, performing medium temperature annealing; and 6, performing high temperature hot pressing. The preparation method is used for preparing the Nb / high Nb-TiAl layered composite material, and can be directly used for forming plates and other Nb / high Nb-TiAl alloy layered compositematerials with complex shapes.

Description

technical field [0001] The invention belongs to the technical field of alloy material preparation, and in particular relates to a Nb / high Nb-TiAl layered composite material and a preparation method thereof. Background technique [0002] High Nb-TiAl-based alloys have excellent high-temperature performance. Compared with ordinary TiAl alloys, high-Nb-TiAl-based alloys can not only improve the oxidation resistance of TiAl alloys above 700 °C, but also increase the service temperature of TiAl-based alloys by 60~ 100°C. However, the high Nb-TiAl alloy has low room temperature plasticity and toughness, and its intrinsic brittleness makes it very difficult to process and form, so it is difficult to prepare thinner plates and other structural parts with complex shapes; using isothermal forging, hot rolling, etc. The processing of high Nb-TiAl alloys has achieved certain effects; however, these methods have high requirements for equipment and technology, and the cost is also high. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/01B32B33/00B32B37/06B32B37/10C23C14/16C23C14/35
CPCB32B15/01B32B33/00B32B37/06B32B37/10B32B2255/06B32B2255/205B32B2307/306B32B2307/558B32B2309/02B32B2309/04B32B2309/12C23C14/165C23C14/35
Inventor 骆良顺李东海徐严谨韩宝帅王亮苏彦庆郭景杰
Owner HARBIN INST OF TECH
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