Combustion resistant Al-Li-Ta alloy

An alloy, aluminum-lithium alloy technology, applied in the field of alloys, can solve the problem that the anti-combustion performance cannot meet the requirements, etc., and achieve the effect of reducing the content of flame retardant elements, reducing the amount of use, and improving the flame retardant effect.

Inactive Publication Date: 2018-01-23
GUANGZHOU YUZHI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a structural material, it is far from enough to meet the requirements of only having combustion resistance during smelting. More importantly, the final aluminum-lithium alloy product must also have satisfactory mechanical strength, at least reaching the level commonly used. Mechanical properties of Al-Li alloys

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] An Al-Li-Ta aluminum-lithium alloy with combustion resistance when smelted at 710 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 5.1wt.%, Ta: 1.2wt.%, Sr: 4.6wt.%, In: 1.2wt.%, Gd: 0.3wt.%, Dy: 0.2wt .%, Ho: 0.1wt.%, B: 1.4wt.%, 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: 270 degrees, 1.5 hours. The final heat treatment process after rolling is: vacuum solution treat...

Embodiment 2

[0021]An Al-Li-Ta aluminum-lithium alloy with combustion resistance when smelted at 740 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 5.8wt.%, Ta: 1.7%, Sr: 2.6wt.%, In: 2.3wt.%, Gd: 0.4wt.%, Dy: 0.3wt.% , Ho: 0.2wt.%, B: 1.6wt.%, 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 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 8% in each pass. Every 3 passes of rolling requires an intermediate heat treatment to eliminate work hardening, the process is: 270 degrees, 1.5 hours. The final heat treatment process after rolling is: vacuum solution t...

Embodiment 3

[0023] An Al-Li-Ta aluminum-lithium alloy with combustion resistance when smelted at 760 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 4.6wt.%, Ta: 1.3wt.%, Sr: 4.2wt.%, In: 3.6wt.%, Gd: 0.3wt.%, Dy: 0.2wt .%, Ho: 0.1wt.%, B: 1.8wt.%, 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 760 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 760°C for 10 minutes for casting. The ingot was deformed at room temperature with a rolling reduction of 9% per pass. Every 3 passes of rolling requires an intermediate heat treatment to eliminate work hardening, the process is: 270 degrees, 1.5 hours. The final heat treatment process after rolling is: vacuum solution treatment...

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Abstract

The invention discloses an Al-Li-Ta aluminum and lithium alloy and a machining technology thereof. The Al-Li-Ta aluminum and lithium alloy is smelted at the temperature of 700-800 DEG C and has a combustion resistant property. The Al-Li-Ta alloy is composed of, by weight, 2.0-6.0% of Li, 1.0-2.0% of Ta, 2.0-8.0% of Sr, 1.0-4.0% of In, 0.2-0.6% of Gd, 0.2-0.4% of Dy, 0.1-0.2% of Ho, 1.0-2.5% of B and the balance aluminum. By adopting the optimized alloying method, the utilization amount of the alloy elements can be reduced greatly, a very good combustion resistant effect can be achieved, and the combustion point of the alloy rises sharply while the content of the combustion resistant elements is reduced obviously. The purpose that the alloy can be subjected to heat preservation and standingfor 5 hours without obvious combustion under the atmosphere environment within the range of 700-800 DEG C. The alloy material has the mechanical property of a traditional aluminum and lithium alloy,the yield strength is 400-650 MPa, the tensile strength is 500-750 MPa, and the ductility is 4-15%. Meanwhile, the alloy has the high heat conductivity property which the traditional aluminum and lithium alloy does not have, the heat conductivity coefficient is 120-140W / m.K, while the heat conductivity coefficient of the traditional aluminum and lithium alloy is about 85W / m.K.

Description

technical field [0001] The invention relates to the technical field of alloys, in particular to an aluminum-lithium alloy. Background technique [0002] Lithium is the lightest metal element in the world. When lithium is added to aluminum, an aluminum-lithium alloy is formed. Lithium can both reduce the density of aluminum and increase the modulus of elasticity. Generally speaking, for every 1wt.% lithium added to aluminum metal, the density of aluminum alloy will decrease by about 3%, while its modulus of elasticity will increase by about 6%, making it a strong competitive product for composite materials. Aluminum-lithium alloys are mainly developed for the weight reduction of aircraft and aerospace equipment, so they are also mainly used in the aerospace field, nuclear reactor materials, tank armor-piercing bombs, torpedoes and other weapon structural parts. In addition, it is also fully used in the fields of automobiles and robots. Aluminum-lithium alloys are mainly us...

Claims

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Application Information

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