Antiflaming aluminum-lithium alloy including Sc and Te and machining process thereof

An aluminum-lithium alloy and alloy technology, applied in the field of alloys, can solve the problems of restricting the industrial application of Be and Ca, unsatisfactory combustion resistance, damage to the mechanical properties of aluminum-lithium alloys, etc. Plasticity and viscosity, the effect of reducing the content of flame retardant elements

Inactive Publication Date: 2018-03-23
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
It was reported earlier that the addition of Be and Ca to Al-Li alloys can significantly improve the oxidation resistance of Al-Li alloys, but Be is highly toxic, and excessive Ca will seriously damage the mechanical properties of Al-Li alloys, which greatly limits the performance of Be. Industrial Application of Li and Ca in Flame Retardant Al-Li Alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] An aluminum-lithium alloy containing Sc and Te with combustion resistance when smelted at 710 degrees. By weight percentage, the chemical composition of the alloy is: Li: 5.3wt.%, Sc: 2.6wt.%, Sr: 4.7wt.%, Te: 1.2wt.%, Si: 2.1wt.%, Sn: 1.6wt% .%, Er: 0.8wt.%, Yb: 0.2wt.%, Nd: 0.3wt.%, the balance is aluminum. The preparation method of the alloy: the above-mentioned raw materials are added into an induction furnace in an atmospheric environment, and a silicon carbide crucible is used. Induction heating to 710 degrees to form an alloy solution, and fully stirring for about 10 minutes using the electromagnetic effect. The alloy liquid was cast into a water glass mold at 710 degrees for 10 minutes for casting. The ingot is deformed at room temperature, and the rolling reduction per pass is 6%. Every 3 passes of rolling requires an intermediate heat treatment to eliminate work hardening. The process is: 210 degrees, 2.4 hours; the final heat treatment process after rollin...

Embodiment 2

[0020]An aluminum-lithium alloy containing Sc and Te with combustion resistance when smelted at 700 degrees. By weight percentage, the chemical composition of the alloy is: Li: 5.2wt.%, Sc: 2.2wt.%, Sr: 4.7wt.%, Te: 1.2wt.%, Si: 2.6wt.%, Sn: 1.4wt% .%, Er: 0.9wt.%, Yb: 0.6wt.%, Nd: 0.3wt.%, the balance is aluminum. The preparation method of the alloy: the above-mentioned raw materials are added into an induction furnace in an atmospheric environment, and a silicon carbide crucible is used. Induction heating to 700 degrees to form an alloy solution, and fully stirring for about 10 minutes by electromagnetic effect. The alloy liquid was cast into a water glass mold at 700 degrees for 10 minutes for casting. The ingot is deformed at room temperature, and the rolling reduction per pass is 8%. Every 3 passes of rolling requires an intermediate heat treatment to eliminate work hardening. The process is: 210 degrees, 2.4 hours; the final heat treatment process after rolling is: va...

Embodiment 3

[0022] An aluminum-lithium alloy containing Sc and Te with combustion resistance when smelted at 730 degrees. By weight percentage, the chemical composition of the alloy is: Li: 5.8wt.%, Sc: 2.1wt.%, Sr: 5.9wt.%, Te: 1.4wt.%, Si: 3.5wt.%, Sn: 1.3wt% .%, Er: 0.7wt.%, Yb: 0.3wt.%, Nd: 0.2wt.%, and the balance is aluminum. The preparation method of the alloy: the above-mentioned raw materials are added into an induction furnace in an atmospheric environment, and a silicon carbide crucible is used. Induction heating to 730 degrees to form an alloy solution, and fully stirring for about 10 minutes using the electromagnetic effect. The alloy liquid was poured into a water glass mold at 730 degrees for 10 minutes for casting. The ingot is deformed at room temperature, and the rolling reduction per pass is 8%. Every 3 passes of rolling requires an intermediate heat treatment to eliminate work hardening. The process is: 210 degrees, 2.4 hours; the final heat treatment process after ...

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Abstract

The invention discloses a flame-retardant aluminum-lithium alloy containing Sc and Te when smelted between 700-800 degrees and a processing technology thereof. In terms of weight percentage, the chemical composition of the alloy is: Li: 2.0‑6.0wt.%, Sc: 2.0‑3.0wt.%, Sr: 4.0‑8.0wt.%, Te: 1.0‑2.0wt.%, Si: 2.0 ‑4.0wt.%, Sn: 1.0‑2.0wt.%, Er: 0.5‑1.5wt.%, Yb: 0.2‑0.8wt.%, Nd: 0.2‑0.4wt.%, and the balance is aluminum. The alloy melt has extremely excellent flame retardancy under static conditions. In the dynamic process, when the surface film is destroyed by violent stirring, it can still be regenerated quickly, successfully hindering the oxidative combustion of the alloy.

Description

technical field [0001] The invention relates to the technical field of alloys, in particular to an aluminum-lithium alloy. Background technique [0002] Lithium has a very small density (0.53 g / cm 3 ), which is 1 / 14 of steel, 1 / 5 of aluminum, and 1 / 3 of magnesium. When lithium is added to aluminum, it forms the very light aluminum-lithium alloy structural material to date. It has good specific strength and elastic modulus, and its density is only 2.4g / cm 3 . With the increase of lithium content, the density of aluminum-lithium alloy can be further reduced, and it has more excellent cold and hot deformation ability, better corrosion resistance and suitable ductility. In general, the density of the aluminum alloy can be reduced by 3% and the modulus can be increased by 6% for every 1 wt.% lithium added. [0003] Aluminum-lithium alloy has excellent mechanical properties, high damping performance for shock absorption and noise reduction, as well as anti-radiation and anti-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C21/02C22C1/02C22F1/04C22F1/02C22F1/043
CPCC22C21/00C22C1/026C22C21/02C22F1/02C22F1/04C22F1/043
Inventor 杨长江
Owner GUANGZHOU YUZHI TECH CO LTD
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