Preparation method for gamma-TiAl alloy fine fully lamellar microstructure with preferred oriented lamellar interface

A preferred orientation, full-sheet technology, applied in the field of γ-TiAl-based alloy intermetallic compounds, can solve problems such as poor plasticity at room temperature, and achieve the effects of less difficulty in processing and assembly, less anisotropy of mechanical properties, and small grain size.

Inactive Publication Date: 2014-04-30
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
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Problems solved by technology

[0007] The object of the present invention is to provide a method for preparing fine full-lamellar structures of γ-TiAl alloys with preferential orientation of the lamellae interfaces, which can effectively solve the problem of poor room temperature plasticity of the full-lamellar structures of γ-TiAl alloys, and obtain lamella interface-optimized Fine full lamellar structure of γ-TiAl alloy with excellent comprehensive mechanical properties in orientation and bearing direction

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  • Preparation method for gamma-TiAl alloy fine fully lamellar microstructure with preferred oriented lamellar interface
  • Preparation method for gamma-TiAl alloy fine fully lamellar microstructure with preferred oriented lamellar interface
  • Preparation method for gamma-TiAl alloy fine fully lamellar microstructure with preferred oriented lamellar interface

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Embodiment 1- Embodiment 2

[0042] Prepared Ti-47Al-2Cr-2Nb-0.15B alloy, the alloy α phase transition temperature T α It was determined to be 1340°C by metallographic method. The alloy was subjected to sheath hot extrusion deformation at 1300°C, and the extrusion ratios were 8 and 11, respectively. Deformed tissues such as figure 2 As shown, in the corresponding tissue α 2 Opposite pole figure such as image 3 shown. It can be seen from the figure that in the deformed tissue α 2 The phase grains are fine and uniform, equiaxed grains, α in the structure 2 The phase has a strong silk texture. The deformed structure after single-phase solution treatment at 1340°C for 5 minutes is as follows: Figure 4 It can be seen from the figure that the lamellar interfaces of most grains in the structure are parallel or nearly parallel to the extrusion direction. In this tissue (extrusion ratio is 11) α 2 The reverse pole diagram of the phase is shown in Figure 5 It can be seen from the figure that α 2 The...

Embodiment 3- Embodiment 4

[0044] Prepared Ti-47Al-2Cr-2Nb-0.15B alloy, the alloy α phase transition temperature T α It was determined to be 1340°C by metallographic method. The alloy was subjected to sheath hot extrusion deformation at temperatures of 1250°C and 1340°C, and the extrusion ratio was 8. α in the final deformed tissue and deformed tissue 2 Opposite pole figures are as Figure 6 and Figure 7 shown. It can be seen from the figure that in the deformed tissue α 2 The phase grains are fine and uniform, which are equiaxed grains and lamellar grains respectively. In the structure, α 2 The phase has a strong silk texture. The alloy 1340 ℃ single-phase solid solution treatment structure is as follows Figure 8 It can be seen from the figure that the lamellar interfaces of most grains in the structure are parallel or nearly parallel to the extrusion direction. Table 1 shows the microstructure characteristics of the above-mentioned deformed microstructure and the subsequent α-single-phase s...

Embodiment 5

[0046] Prepared Ti-47Al-2Cr-2Nb-0.15B alloy, the alloy α phase transition temperature T α It was determined to be 1340°C by metallographic method. The alloy was subjected to three-pass near-isothermal forging deformation at 1300°C, 1280°C and 1250°C in sequence, and the final reduction was 65%. α in the final deformed tissue and deformed tissue 2 Opposite pole figures are as Figure 9 and Figure 10 shown. It can be seen from the figure that in the deformed tissue α 2 The equiaxed grains are fine and uniform, and most of the α 2 The phase direction is parallel to the pressing direction. The alloy 1340 ℃ single-phase solid solution treatment structure is as follows Figure 11 It can be seen from the figure that the lamellar interfaces of most grains in the structure are vertical or nearly perpendicular to the direction of pressing. Table 1 shows the microstructure characteristics of the above-mentioned deformed microstructure and the subsequent α-single-phase solution-...

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Abstract

The invention relates to and belongs to the field of a gamma-TiAl-based alloy intermetallic compound and particularly relates to a preparation method for a gamma-TiAl alloy fine fully lamellar microstructure with a preferred oriented lamellar interface. According to the method, the fine fully lamellar microstructure with the preferred oriented lamellar interface is obtained on the basis of microstructure texture evolution of a gamma-TiAl alloy in the thermal deformation and the subsequent thermal treatment process. The preparation method has the technical characteristics as follows: a, a thermal deformation process is adopted to process the gamma-TiAl alloy; b, an alpha2 phase in a gamma-TiAl alloy deformed microstructure has strong deformation texture;c, the deformed microstructure is subjected to alpha single-phase region solution treatment and solution time is controlled to avoid abnormal growth of alpha crystal grains so as to obtain the fine fully lamellar microstructure. The method disclosed by the invention can effectively solve the problem of poor room temperature plasticity of the gamma-TiAl alloy fully lamellar microstructure and obtains the gamma-TiAl alloy fine fully lamellar microstructure with the preferred oriented lamellar interface and excellent comprehensive mechanical property in the bearing direction.

Description

technical field [0001] The invention relates to the field of gamma-TiAl-based alloy intermetallic compounds, in particular to a method for preparing a fine full-lamellar structure of a gamma-TiAl alloy with preferential orientation of the lamellar interface. Background technique [0002] γ-TiAl alloy has the characteristics of low density, high specific strength, high specific modulus, good flame retardancy and oxidation resistance, etc. It has broad application prospects in high-temperature structural components in aerospace and automobiles. The high-temperature structural application of γ-TiAl alloy generally adopts the full lamellar structure with excellent high-temperature mechanical properties, but the poor room temperature plasticity of this structure restricts its practical application. [0003] Previous studies have shown that the room temperature plasticity of the full lamellar structure can be improved by refining the lamellar grain size through thermal deformation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/00C22F1/18
Inventor 刘仁慈刘冬崔玉友杨锐
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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