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Method for determining orientation of beta phase of titanium alloy by microstructure morphology

A microstructure and titanium alloy technology, applied in the direction of measuring devices, instruments, and material analysis through optical means, can solve the problems that the orientation and shape cannot be observed and analyzed, the visible area is small, and the cost is high, etc., to achieve fast Automated calibration, improved scope of application, and improved efficiency

Active Publication Date: 2019-01-15
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for determining the β-phase orientation of titanium alloys from the microstructure, to solve the existing technical means in determining the β-phase orientation in titanium alloys. Corresponding to observation and analysis, the visual area is small, the problem of low efficiency and high cost

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  • Method for determining orientation of beta phase of titanium alloy by microstructure morphology

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Embodiment

[0035] Objective: To determine the original β-orientation of TA19 (Ti-6Al-2Sn-4Zr-2Mo-0.1Si) alloy.

[0036] 1. The TA19 alloy sample of Φ15×12 was kept at 10°C above the β phase transition temperature for 10 minutes, and then cooled to room temperature with the furnace to obtain a Widmanstatten tissue sample.

[0037] 2. Using the Widmanstatten tissue sample obtained in step 1 to prepare a thin-section sample for transmission electron microscope observation.

[0038] 3. Use a transmission electron microscope to observe the α bundle in the thin-section sample obtained in step 2, combine the imaging mode with the diffraction mode, and determine the habitual surface {hkl} when the α phase is precipitated from the β phase in the TA19 alloy βh .

[0039] 4. According to the crystallographic symmetry relationship of the β phase, determine the habitual surface {hkl} obtained in step 3 βh i equivalent crystal planes (h 1 k 1 l 1 ) βh ,(h 2 k 2 l 2 ) βh ,(h 3 k 3 l 3 ) β...

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Abstract

The invention belongs to the field of microstructure analysis of titanium alloys and crystallography, and relates to a method for determining the orientation of the beta phase of a titanium alloy by amicrostructure morphology. According to the crystal orientation relation between the alpha phase and the beta phase, the orientation of the original beta phase is calculated reversely and the orientation of the precipitated alpha phase can be determined at the same time by an ordinary microstructure morphology. The requirements of sample preparation are reduced, and the efficiency of data collection and analysis is improved, so that the limitations for device conditions and capabilities are relaxed; therefor, the crystal orientation measurement and analysis can be realized by an ordinary low-cost optical microscope, thereby greatly improving the application range of the method, and reducing the testing cost. Meanwhile, after the drawing of a map and the establishment of a database are completed, the automatic calibration of the crystal orientation can be rapidly achieved by the expansion application of big data and image recognition technology, so that the efficiency is improved.

Description

technical field [0001] The invention belongs to the field of titanium alloy microstructure analysis and crystallography, and relates to a method for determining the beta-phase orientation of titanium alloy from the microstructure morphology. Background technique [0002] Titanium alloy has won the reputation of the fourth metal because of its low density, high strength and toughness, and corrosion resistance. It is widely used in national strategic fields such as aviation and aerospace, and civilian fields such as medicine and chemical industry. Due to the allotropic transformation of high-temperature cubic β phase and low-temperature hexagonal close-packed α phase following the Burgers orientation relationship, titanium alloys present a specific microstructure. In the microstructure evolution analysis and control of titanium alloys and the study of macro- and micro-mechanical behavior, the orientation of the original β-phase is very critical. It is the basis and starting po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/2202G01N23/2206G01N21/84G01N23/2251
CPCG01N21/84G01N23/2202G01N23/2206G01N23/2251
Inventor 周毅曹京霞黄旭
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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