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Equiaxed grain refinement of titanium silicon binary alloy microscopic constitution

A binary alloy and microstructure technology, which is applied in the field of heat treatment of titanium-silicon binary alloy materials, can solve problems affecting the performance of the alloy, uneven grain distribution and size, etc., with flexible methods and a wide range of size selection , The treatment process is simple and feasible

Inactive Publication Date: 2009-06-24
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Ti in the microstructure of titanium-silicon as-cast alloy 5 Si 3 The grain orientation of the phase is different, and the grain distribution and size are very uneven, which will affect the performance of the alloy

Method used

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  • Equiaxed grain refinement of titanium silicon binary alloy microscopic constitution
  • Equiaxed grain refinement of titanium silicon binary alloy microscopic constitution
  • Equiaxed grain refinement of titanium silicon binary alloy microscopic constitution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put the bulk Ti-13.67Si (at%) eutectic cast alloy into the resistance furnace, then raise the temperature in the resistance furnace cavity from room temperature to 1100 °C at a rate of 5 °C per minute, and increase the temperature at 1100 °C After maintaining the temperature at ℃ for 120 minutes, turn off the power supply of the resistance furnace, and allow the alloy material to cool down to room temperature with the furnace. Ti in microstructure of alloy after treatment 5 Si 3 The phase transition becomes nearly equiaxed, and the average grain diameter is refined to 1-6 μm. The scanning electron microscope photos of its microstructure are shown in figure 1 . The hardness of the alloy was tested with HV-3 Vickers hardness tester. Under the same test conditions, the hardness of the treated alloy was 31HV higher than that of the as-cast alloy.

Embodiment 2

[0024] Put the bulk Ti-13.67Si (at%) eutectic cast alloy into the resistance furnace, then raise the temperature in the resistance furnace chamber from room temperature to 1200 °C at a rate of 5 °C per minute, and then increase the temperature at 1200 °C After maintaining the temperature at ℃ for 120 minutes, turn off the power supply of the resistance furnace, and allow the alloy material to cool down to room temperature with the furnace. Ti in microstructure of alloy after treatment 5 Si 3 The phase transition becomes nearly equiaxed, and the average grain diameter is refined to 1-8 μm. The scanning electron micrographs of the microstructure are shown in figure 2 . The hardness of the alloy was tested with HV-3 Vickers hardness tester. Under the same test conditions, the hardness of the treated alloy was 56HV higher than that of the as-cast alloy.

Embodiment 3

[0026] Put the bulk Ti-8Si (at%) hypoeutectic cast alloy into the resistance furnace, then the temperature in the resistance furnace chamber is raised from room temperature to 1100 °C at a rate of 5 °C per minute, and at 1100 °C After maintaining the temperature at ℃ for 120 minutes, turn off the power supply of the resistance furnace, and allow the alloy material to cool down to room temperature with the furnace. Ti in microstructure of alloy after treatment 5 Si 3 The phase transition becomes nearly equiaxed, the average grain diameter is refined to 5-10 μm, and the metallographic photo of the microstructure is shown in image 3 . The hardness of the alloy was tested with HV-3 Vickers hardness tester. Under the same test conditions, the hardness of the treated alloy was 141HV higher than that of the as-cast alloy.

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Abstract

A titanium silicon binary alloy microscopic constitution equiaxial grain refining technique comprises: materials are heated to higher temperature of beta phrase area for high temperature treatment, and then cooled; titanium silicon eutectic alloy material is heated to the temperature which is higher than a beta transition point and lower than 1000 DEG C for heat preservation, and then cooled, or processed by titanium timber heat treatment at the temperature of 550-750 DEG C after the heat treatment is finished at the beta single-phase temperature area. The technique can eliminate strip or block Ti5Si3 phrase in the titanium silicon binary cast state alloy microscopic constitution, and leads the average diameter of wild phase Ti5Si3 crystal grains to be thinned to be 1-20mum. The titanium silicon binary cast state alloy microscopic constitution can reach equiaxial grain refining.

Description

1. Technical field [0001] The invention relates to the technical field of material heat treatment, in particular to a heat treatment process for obtaining a titanium-silicon binary alloy material with a fine equiaxed microstructure. 2. Background technology [0002] Titanium alloys have the advantages of high specific strength, good plasticity, corrosion resistance, and excellent biocompatibility, and are widely used in aerospace, navigation, automobile, chemical industry, biomedicine, leisure industry and other fields. The casting performance of Ti-Si eutectic alloy is excellent, its melting point is low (the alloy melting point of eutectic composition is only 1350 ℃), the crystallization interval is small, and the fluidity is good. As a new type of cast titanium alloy, it has a different strengthening mechanism from traditional titanium alloys: the tough α-Ti is used as the matrix, and the hard and brittle phase is the intermetallic compound Ti with high melting point and ...

Claims

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Application Information

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IPC IPC(8): C22F1/18
Inventor 湛永钟张新疆
Owner GUANGXI UNIV
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