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Preparation method of TiAl3 enhanced aluminum-based composite material

A composite material and a technology for reinforcing aluminum matrix, which is applied in the field of preparation of aluminum matrix composite materials, can solve problems such as hindering development and occurrence of macrosegregation, and achieve the effects of convenient operation, uniform distribution and low process cost.

Inactive Publication Date: 2010-11-10
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TiAl produced by the traditional in-situ casting process 3 Reinforced phases are square and needle-shaped, individual whiskers may form, and macro-segregation may appear from time to time
This will hinder its further development

Method used

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  • Preparation method of TiAl3 enhanced aluminum-based composite material
  • Preparation method of TiAl3 enhanced aluminum-based composite material
  • Preparation method of TiAl3 enhanced aluminum-based composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] First cryolite powder (Na 3 AlF 6 ) and titanium powder (Ti) were uniformly mixed and dried at a mass ratio of 0.5:1; the 7075 aluminum alloy was heated and melted in a graphite crucible, and at a temperature of 830°C, the above-mentioned mixed powder was mixed according to the ratio of titanium to 7075 aluminum alloy Add 1wt.% of the mass number to the 7075 aluminum alloy melt, and then extend the ultrasonic horn into the aluminum alloy melt. Under the condition of ultrasonic power of 800W, ultrasonic for 20min; the temperature of the melt is lowered to 740°C , and then continue to sonicate for 4 minutes, pour into the metal model, and take samples after cooling.

Embodiment 2

[0012] First cryolite powder (Na 3 AlF 6 ) and titanium powder (Ti) were uniformly mixed and dried at a mass ratio of 0.5:1; the 7075 aluminum alloy was heated and melted in a graphite crucible; Add 2wt.% of the mass number to the 7075 aluminum alloy melt, and then extend the ultrasonic horn into the aluminum alloy melt. Under the condition of ultrasonic power of 800W, ultrasonic for 25min; the temperature of the melt is lowered to 750°C , and then continue to sonicate for 4 minutes, pour into the metal model, and take samples after cooling.

Embodiment 3

[0014] First cryolite powder (Na 3 A1F 6 ) and titanium powder (Ti) according to the mass ratio of 1:1, uniformly mixed and dried; put the 7075 aluminum alloy into the graphite crucible to heat and melt, and at a temperature of 850°C, mix the above mixed powder according to the ratio of titanium to 7075 aluminum alloy Add 4wt.% of the mass number to the 7075 aluminum alloy melt, and then extend the ultrasonic horn into the aluminum alloy melt. Under the condition of ultrasonic power of 1000W, ultrasonic for 30min; the temperature of the melt is lowered to 760°C , and then continue to sonicate for 4 minutes, pour into the metal model, and take samples after cooling.

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Abstract

The invention discloses a preparation method of a TiAl3 enhanced aluminum-based composite material. The preparation method is characterized by comprising the following steps: uniformly mixing cryolite powder with titanium powder according to the mass ratio of 1-0.5:1 and drying; placing a 7075 aluminum alloy into a graphite crucible and heating and melting; adding the mixed powder into a 7075 aluminum alloy melt according to the ratio that titanium accounts for 1-6 weight percent of the mass fraction of the 7075 aluminum alloy at the temperature of 830-850DEG C; extending an ultrasound amplitude transformer into the aluminum alloy melt and carrying out the ultrasound at the ultrasound power of 800-1,000W for 20-35min; and reducing the melt temperature to be 740-760DEG C and continuously carrying out the ultrasound for 2-6min. The obtained TiAl3 / 7075 aluminum-based composite material has fine crystal grains in the tissue; and the generated TiAl3 enhanced phase has uniform distribution, is in a fine granule shape and has no macrosegregation phenomenon. The process has the advantages of low process cost, simple flow, safety, reliability and convenient operation.

Description

technical field [0001] The invention belongs to the field of metal material preparation, and in particular relates to a preparation method of an aluminum-based composite material. Background technique [0002] Particle-reinforced aluminum matrix composites have many advantages such as specific strength, high specific stiffness, high wear resistance, and high vibration damping. TiAl 3 Because of its good thermoelectric properties, high melting point, high hardness, high elastic modulus and low price, it is an ideal reinforcing phase and has attracted the attention of many scholars. Ti and Al in the particle-reinforced aluminum-matrix composite prepared by the in-situ reaction method will undergo a chemical reaction spontaneously, and the equation is: Ti(s)+3Al(l)=TiAl 3 (s). Composite materials produced by in-situ reaction have the characteristics of good interfacial bonding, no pollution, good thermal stability, and cost saving, so they have gradually attracted attention....

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C21/00
Inventor 揭小平陈小会闫洪
Owner NANCHANG UNIV
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