Ti-containing flame-retardant aluminum lithium alloy and processing process thereof

An aluminum-lithium alloy and alloy technology, applied in the field of alloys, can solve problems such as high thermal cracking tendency, low product yield, and poor quality, and achieve the effects of reducing the content of flame-retardant elements, increasing the ignition point of the alloy, and good flame-retardant effect

Inactive Publication Date: 2017-11-28
GUANGZHOU YUZHI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(5) The dynamic viscosity of aluminum-lithium alloy is low
The Al-Li-Ti aluminum-lithium alloy has a low liquid-solid phase solidification temperature range, which can solve the problem of large hot cracking tendency during casting, obvious casting voids and porosity, extensive melt treatment process, poor quality, large hot cracking tendency, and poor casting performance. Poor, low product yield, low high temperature strength, poor reusability of waste materials and slag materials and other technical problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] An Al-Li-Ti aluminum-lithium alloy with combustion resistance when smelted at 710 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 3.5wt.%, Ti: 1.8wt.%, Sr: 2.6wt.%, Mg: 2.2wt.%, Eu: 0.3wt.%, Sn: 0.9wt .%, Th: 0.2wt.%, S: 0.8wt.%, B: 0.6wt.%, the balance is aluminum. The preparation method of the alloy: add the above-mentioned raw materials into the induction furnace under the atmospheric environment, and use a silicon carbide crucible. Induction heating to 710 degrees to form an alloy solution, and use the electromagnetic effect to fully stir for about 10 minutes. The alloy liquid is poured into a water glass mold at 710°C for 10 minutes for casting. The ingot was deformed at room temperature with a rolling reduction of 6% in each pass. Every 3 passes of rolling requires an intermediate heat treatment to eliminate work hardening, the process is: 320 degrees, 1.5 hours. The final heat treatment process after rolling is: vacuum so...

Embodiment 2

[0021]An Al-Li-Ti aluminum-lithium alloy with combustion resistance when smelted at 740 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 4.8wt.%, Ti: 1.3wt.%, Sr: 2.6wt.%, Mg: 2.3wt.%, Eu: 0.3wt.%, Sn: 0.9wt .%,Th: 0.2wt.%, S: 0.8wt.%, B: 0.9wt.%, the balance is aluminum. The preparation method of the alloy: add the above-mentioned raw materials into the induction furnace under the atmospheric environment, and use a silicon carbide crucible. Induction heating to 740 degrees to form an alloy solution, and use the electromagnetic effect to fully stir for about 10 minutes. The alloy liquid is poured into a water glass mold at 740 degrees for 10 minutes for casting. The ingots were deformed at room temperature with a rolling reduction of 7% per pass. Every 3 passes of rolling requires an intermediate heat treatment to eliminate work hardening, the process is: 320 degrees, 1.5 hours. The final heat treatment process after rolling is: vacuum ...

Embodiment 3

[0023] An Al-Li-Ti aluminum-lithium alloy with combustion resistance when smelted at 790 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 5.4wt.%, Ti: 1.9wt.%, Sr: 2.3wt.%, Mg: 2.4wt.%, Eu: 0.3wt.%, Sn: 0.9wt .%,Th: 0.2wt.%, S: 0.9wt.%, B: 0.8wt.%, the balance is aluminum. The preparation method of the alloy: add the above-mentioned raw materials into the induction furnace under the atmospheric environment, and use a silicon carbide crucible. Induction heating to 790 degrees to form an alloy solution, and use the electromagnetic effect to fully stir for about 10 minutes. The alloy liquid is poured into a water glass mold at 790 degrees for 10 minutes for casting. The ingot was deformed at room temperature with a rolling reduction of 6% in each pass. Every 3 passes of rolling requires an intermediate heat treatment to eliminate work hardening, the process is: 320 degrees, 1.5 hours. The final heat treatment process after rolling is: vacu...

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Abstract

The invention discloses Al-Li-Ti aluminum lithium alloy with combustion resistance during smelting between 700 DEG C and 800 DEG C and a processing process thereof. The Al-Li-Ti aluminum lithium alloy comprises the following chemical components in percentage by weight: 2.0-6.0 percent of Li, 1.0-2.0 percent of Ti, 2.0-4.0 percent of Sr, 2.0-3.0 percent of Mg, 0.2-0.4 percent of Eu, 0.8-2.0 percent of Sn, 0.2-0.3 percent of Th, 0.5-1.4 percent of S, 0.4-1.8 percent of B and the balance of aluminum. The Al-Li-Ti aluminum lithium alloy disclosed by the invention has extremely excellent flame retardant property in a static state and can achieve no obvious combustion after heat preservation in an atmospheric environment within the temperature range of 700-800 DEG C and standing for 5 hours. In the dynamic process, such as in the processes of liquid alloy stirring, air-blowing and melt treatment, when being damaged by intense stirring, a surface film of the aluminum lithium alloy can be rapidly regenerated, so that the oxidative combustion of the alloy is successfully impeded. The obtained aluminum lithium alloy has mechanical properties of traditional aluminum lithium alloy at a room temperature and also has high-temperature mechanical properties of which the traditional aluminum lithium alloy are not available; under 300 DEG C, the yield strength is 350-400 MPa; when a traditional material is under 300 DEG C, the yield strength is about 250-300 MPa.

Description

technical field [0001] The invention relates to the technical field of alloys, in particular to an aluminum-lithium alloy. Background technique [0002] Adding lithium as an alloying element to aluminum forms an aluminum-lithium alloy. Lithium can both reduce the density of aluminum and increase the modulus of elasticity. Generally, for every 1wt.% lithium added to an aluminum alloy, the density decreases by about 3%, while its modulus of elasticity increases by about 6%. Aluminum-lithium alloys are mainly developed for the weight reduction of aircraft and aerospace equipment, so they are mainly used in the aerospace field, as well as ordnance and nuclear reactor materials, tank armor-piercing bombs, torpedoes and other weapon structural parts. Aluminum-lithium alloys have been used in military aircraft, civil airliners and helicopters, mainly for fuselage frames, hatches, fuel tanks, etc. Using aluminum-lithium alloy to manufacture aircraft can reduce its weight by 14.6w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/06C22C21/00C22C1/02C22F1/04C22F1/02C22F1/047
CPCC22C1/026C22C21/00C22C21/06C22F1/02C22F1/04C22F1/047
Inventor 杨长江
Owner GUANGZHOU YUZHI TECH CO LTD
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