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Hf (hydrogen fluoride)-contained flame-retardant aluminum-lithium alloy and processing technique thereof

An aluminum-lithium alloy and alloy technology, applied in the field of alloys, can solve the problems of extensive melt treatment process, large tendency of hot cracking, low yield of products, etc., to solve the problems of large tendency of hot cracking, excellent flame retardancy, and increased ignition point of alloys Effect

Inactive Publication Date: 2017-12-01
GUANGZHOU YUZHI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

(5) The dynamic viscosity of aluminum-lithium alloy is low
The Al-Li-Hf aluminum-lithium alloy has a low liquid-solid phase solidification temperature range, which can solve the problems of large thermal cracking tendency during casting, obvious casting voids and porosity, extensive melt treatment process, poor quality, large thermal 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-Hf aluminum-lithium alloy with combustion resistance when smelted at 720 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 4.7wt.%, Hf: 2.9wt.%, Sr: 5.2wt.%, Fe: 0.9wt.%, Ho: 0.2wt.%, Th: 0.4wt .%, Pr: 0.1wt.%, S: 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 720 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 720 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: 240 degrees, 1.6 hours. The final heat treatment process after rolling is: vacuum solution...

Embodiment 2

[0021]An Al-Li-Hf aluminum-lithium alloy with combustion resistance when smelted at 740 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 5.9wt.%, Hf: 2.9wt.%, Sr: 3.6wt.%, Fe: 1.2wt.%, Ho: 0.2wt.%, Th: 0.4wt .%, Pr: 0.1wt.%, S: 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: 240 degrees, 1.6 hours. The final heat treatment process after rolling is: vacuum solutio...

Embodiment 3

[0023] An Al-Li-Hf aluminum-lithium alloy with combustion resistance when smelted at 780 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 4.9wt.%, Hf: 2.6wt.%, Sr: 5.2wt.%, Fe: 0.8wt.%, Ho: 0.2wt.%, Th: 0.6wt .%, Pr: 0.1wt.%, S: 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 780 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 780 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: 240 degrees, 1.6 hours. The final heat treatment process after rolling is: vacuum soluti...

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Abstract

The invention discloses an Al-Li-Hf aluminum-lithium alloy with combustion resistance 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.%, Hf:1.0‑4.0wt.%, Sr:2.0‑6.0wt.%, Fe:0.4‑2.8wt.%, Ho:0.1 ‑0.3wt.%, Th: 0.2‑0.8wt.%, Pr: 0.1‑0.2wt.%, S: 1.0‑2.0wt.%, and the balance is aluminum. The Al-Li-Hf aluminum-lithium alloy proposed by the present invention has extremely excellent flame-retardant performance under static conditions, and can achieve heat preservation and standing for 5 hours in an atmospheric environment within the range of 700-800 degrees without obvious combustion. In the dynamic process, such as stirring and gas blowing of the liquid alloy, when the surface film is destroyed by violent stirring, it can still be regenerated quickly, successfully preventing the oxidative combustion of the alloy. The obtained aluminum-lithium alloy material has the mechanical properties of traditional aluminum-lithium alloys at room temperature, and has high-temperature mechanical properties that traditional aluminum-lithium alloys do not have: at 300 degrees, the yield strength is 350-400MPa, while the traditional material at 300 degrees, yields The strength is about 250-300MPa.

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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IPC IPC(8): C22C21/00C22C1/02C22F1/02C22F1/04
CPCC22C21/00C22C1/026C22F1/02C22F1/04
Inventor 杨长江
Owner GUANGZHOU YUZHI TECH CO LTD
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