Method for testing tensile mechanical performance of TiAl-base alloy

A test method and alloy-based technology, which is applied in the test field of tensile mechanical properties of TiAl-based alloys, can solve the problems of stress concentration and uneven force at the loading position of fixed samples, and achieve good mechanical properties.

Inactive Publication Date: 2010-05-19
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention provides a TiAl-based Test

Method used

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  • Method for testing tensile mechanical performance of TiAl-base alloy
  • Method for testing tensile mechanical performance of TiAl-base alloy
  • Method for testing tensile mechanical performance of TiAl-base alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The SEM in-situ tensile repeated loading and unloading test was performed on the TiAl-based alloy Ti-48Al-2Cr-2Nb with full-lamellar morphology after casting.

[0041] The first step: Ti-48Al-2Cr-2Nb alloy undergoes pretreatment, 175MPa, 1280℃, holding time of 4h hot isostatic pressing, and then annealing treatment at 800℃ for 12h.

[0042] Step 2: Design the sample size for processing and cutting.

[0043] SEM of unnotched specimen Figure 1B As shown, the side thickness dimension Figure 1C Shown. The overall length of the sample is designed to be 35mm, the width of the clamping section 1 is 14mm, the length of the working section 2 is 17mm, and the width is 4mm. The fillet transition between the working section 2 and the clamping section 1 is 2mm at the R1 position. The thickness dimension is modified from the traditional in-situ tensile specimen dimension. One side of the 1'position of the clamping section at both ends is thickened, and the length of the clamping section ...

Embodiment 2

[0052] The Ti-47Al-2Cr-2Nb-1B alloy with full lamella structure was subjected to SEM in-situ tensile repeated loading and unloading tests.

[0053] The first step: First, the TiAl-based alloy ingot is pretreated. The pretreatment includes hot isostatic pressing and post-homogenization annealing. The hot isostatic pressing treatment temperature is 1280℃, the pressure is 175MPa, and the holding time is 4h. The annealing temperature is 800℃, and the holding time is 12h.

[0054] Step 2: Design the sample size for processing and cutting.

[0055] SEM of the notched specimen Figure 1B As shown, the side thickness dimension Figure 1C Shown. The overall length of the sample is designed to be 35mm, the width of the clamping section 1 is 14mm, the length of the working section 2 is 17mm, and the width is 4mm. The fillet transition between the working section 2 and the clamping section 1 is 2mm at the R1 position. The thickness dimension is modified from the traditional in-situ tensile spe...

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Abstract

The invention discloses a method for testing the tensile mechanical performance of TiAl-base alloy, comprising the steps of preparing raw materials, designing the size of a sample under test, processing and cutting the sample under test, processing the surface of the sample under test, loading and unloading the sample under test repeatedly and measuring the sample under test repeatedly. The sample which has no gap and is under the in-situ tension test by a scanning electron microscope (SEM) is designed and is ruptured under uniform stress to increase the plastic deformation region. The sample is tensed by being repeatedly loaded and unloaded with horizontal stress points on a standard mechanical performance curve. The method is particularly suitable for testing the tensile mechanical performance of the brittle material such as the TiAl-base alloy and can ensure that the morphology of the non-uniform plastic deformation of the brittle material such as the TiAl-base alloy which is tensed repeatedly can be observed in detail, the generation of the crack and the plastic deformation region of the brittle material such as the TiAl-base alloy can be observed, and the mechanical performance of the brittle material such as the TiAl-base alloy can be researched well.

Description

Technical field [0001] The invention relates to a test method for the mechanical properties of an alloy, specifically, a test method for the tensile mechanical properties of a TiAl-based alloy. Background technique [0002] TiAl-based alloy has the advantages of higher service temperature, high temperature strength, elastic modulus, better oxidation resistance and creep resistance, making it superior to other metals and alloys and is highly regarded by material workers in the aerospace industry. Attention, become one of the candidate materials in the new generation of high temperature structural materials used in aircraft engines and rocket propulsion systems. At present, the research focus of titanium-aluminum intermetallic compounds is on alloy research and development. However, TiAl-based alloys have lower room temperature plasticity, high temperature strength and fracture toughness, and the alloy can produce a large degree of damage under a small load, which seriously hinder...

Claims

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Application Information

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IPC IPC(8): G01N3/32G01N1/44G01N1/32
Inventor 马岳毛广杰宫声凯
Owner BEIHANG UNIV
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