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Magnesium-lithium alloy having excellent high-temperature mechanical properties and containing single phase beta and machining technique of magnesium-lithium alloy

A technology of high-temperature mechanics and magnesium-lithium alloy, which is applied in the field of alloys, can solve the problems of limited application range and high-temperature performance degradation, and achieve the effects of high thermal cracking tendency, low production cost, and simple smelting and processing methods

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

AI Technical Summary

Problems solved by technology

Generally cast magnesium-lithium alloys and deformed magnesium-lithium alloys are severely restricted in their application range due to high-temperature performance degradation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A single-phase β-containing magnesium-lithium alloy with excellent high-temperature mechanical properties. In terms of weight percentage, the chemical composition of the alloy is: Li: 14.2wt.%, Fe: 0.3wt.%, Cr: 0.1wt.%, Co: 0.2wt.%, Gd: 0.1wt.%, Er: 0.1wt .%, the balance is magnesium. The preparation method of the alloy: add the above-mentioned raw materials into an induction furnace protected by argon gas, and use a silicon carbide crucible. Induction heating to 750 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 750°C for 10 minutes for casting. The final heat treatment process is: vacuum solution treatment at 340°C for 2 hours; vacuum aging treatment at 170°C for 1 hour. The material has the mechanical properties of a traditional magnesium-lithium alloy: the elastic modulus is 56GPa, the yield strength is 112MPa, the tensile strength is 148MPa, and the e...

Embodiment 2

[0017] A single-phase β-containing magnesium-lithium alloy with excellent high-temperature mechanical properties. In terms of weight percentage, the chemical composition of the alloy is: Li: 16.8wt.%, Fe: 0.2wt.%, Cr: 0.1wt.%, Co: 0.1wt.%, Gd: 0.1wt.%, Er: 0.1wt .%, the balance is magnesium. The preparation method of the alloy: add the above-mentioned raw materials into an induction furnace protected by argon gas, and use a silicon carbide crucible. Induction heating to 750 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 750°C for 10 minutes for casting. The final heat treatment process is: vacuum solution treatment at 340°C for 2 hours; vacuum aging treatment at 170°C for 1 hour. The material has the mechanical properties of a traditional magnesium-lithium alloy: the elastic modulus is 66GPa, the yield strength is 97MPa, the tensile strength is 143MPa, and the el...

Embodiment 3

[0019] A single-phase β-containing magnesium-lithium alloy with excellent high-temperature mechanical properties. In terms of weight percentage, the chemical composition of the alloy is: Li: 17.2wt.%, Fe: 0.3wt.%, Cr: 0.2wt.%, Co: 0.2wt.%, Gd: 0.1wt.%, Er: 0.2wt .%, the balance is magnesium. The preparation method of the alloy: add the above-mentioned raw materials into an induction furnace protected by argon gas, and use a silicon carbide crucible. Induction heating to 750 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 750°C for 10 minutes for casting. Remove the casting after it has completely solidified. The final heat treatment process is: vacuum solution treatment at 340°C for 2 hours; vacuum aging treatment at 170°C for 1 hour. The material has the mechanical properties of a traditional magnesium-lithium alloy: the elastic modulus is 58GPa, the yield stren...

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Abstract

The invention discloses a single-phase β-magnesium-lithium alloy with excellent high-temperature mechanical properties and a processing technology thereof. In terms of weight percentage, the composition of the alloy is: Li:12.0‑18.0wt.%, Fe:0.1‑0.6wt.%, Cr:0.1‑0.2wt.%, Co:0.1‑0.2wt.%, Gd:0.1‑ 0.2wt.%, Er: 0.1‑0.2wt.%, the balance is magnesium. The invention provides a novel material science solution to the sharp decrease and deterioration of the mechanical properties of the current magnesium-lithium alloy at about 100 degrees Celsius. The material has the mechanical properties of traditional magnesium-lithium alloys: the elastic modulus is 50-70GPa, the yield strength is 90-120MPa, the tensile strength is 140-160MPa, and the elongation is 6-18%. And it has high-temperature mechanical properties that traditional magnesium-lithium alloys do not have: at 100 degrees, the yield strength is 140-150MPa, while the traditional magnesium-lithium alloy has a yield strength of about 65MPa at 100 degrees. The smelting and processing method of the casting magnesium-lithium alloy is simple, and the production cost is relatively low. While ensuring high-temperature mechanical properties, the service life of the alloy is further improved, which is convenient for large-scale industrial application. The magnesium-lithium alloy of the present invention can be used for manufacturing at an operating temperature below 100 degrees, and has an extremely significant lightening effect.

Description

technical field [0001] The invention relates to the technical field of alloys, in particular to a magnesium-lithium alloy. Background technique [0002] Magnesium-lithium alloy, the lightest metal structure material in the world today, can be prepared by adding lithium to magnesium, and the density can reach 0.96-1.64g / cm according to the application 3 between. Magnesium-lithium alloy materials have excellent mechanical properties of low density, high specific stiffness, high specific strength, high damping performance of shock absorption and noise elimination, as well as anti-radiation and anti-electromagnetic interference performance, representing the technological frontier of magnesium alloy development, known as It is the most green and environmentally friendly revolutionary material for the future. The same size and weight of magnesium-lithium alloy is only half of that of aluminum alloy, but its specific strength is higher than that of aluminum alloy. Compared with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C1/02C22F1/06
CPCC22C23/00C22C1/02C22F1/06
Inventor 杨长江
Owner GUANGZHOU YUZHI TECH CO LTD
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