Beryllium containing double phase alpha+beta magnesium-lithium alloy and processing technology thereof

A magnesium-lithium alloy, dual-phase technology, applied in the field of alloys, can solve problems such as difficult deformation processing, difficult secondary molding, poor mechanical properties, etc., and achieve the effect of optimizing heat treatment parameters

Inactive Publication Date: 2018-01-16
GUANGZHOU YUZHI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these strengthening effects decrease rapidly with the increase of temperature, and the obtained alloy materials have relatively poor mechanical properties at room temperature
Magnesium-lithium-zinc alloys belong to the precipitation hardening type, and the cost is relatively low, but the mechanical properties of this type of alloy are relatively poor at room temperature
Moreover, existing magnesium-lithium alloys generally have problems such as low high-temperature strength, poor casting performance, and long slag treatment process.
In addition, in recent years, the high-temperature-resistant and high-strength magnesium-lithium alloy formulations that have appeared internationally all contain precious elements, which are not suitable for large-scale industrial production and application.
The α-phase is a close-packed hexagonal crystal, which has poor plastic deformation ability, difficult deformation processing, low processing efficiency, and difficult to further secondary molding, resulting in a very low share of deformed α-phase magnesium-lithium alloys on the market, which seriously restricts its ( Large-scale application of sheets, profiles, pipes, etc.) in aerospace and electronics industries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A beryllium-containing and dual-phase α+β magnesium-lithium alloy. According to the weight ratio, the composition of the alloy is: Li: 9.2wt.%, Be: 0.2wt.%, Sb: 1.3wt.%, Cr: 0.3wt.%, V: 0.1wt.%, Pb: 0.3wt. %, Se: 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. Inductively heat to 750 degrees to form an alloy solution, and use the electromagnetic stirring effect to fully stir for about 10 minutes. The alloy liquid is kept at 750 degrees for 10 minutes and then cast into water glass or graphite molds for casting. The ingot was subjected to deformation treatment at room temperature, and the rolling reduction in each pass was 25%. Every 3 passes of rolling requires an intermediate heat treatment to eliminate work hardening. The process is: 300 degrees for 1 hour. The final heat treatment process after rolling is: vacuum solu...

Embodiment 2

[0017] A beryllium-containing and dual-phase α+β magnesium-lithium alloy. According to the weight ratio, the composition of the alloy is: Li: 9.6wt.%, Be: 0.4wt.%, Sb: 2.6wt.%, Cr: 0.3wt.%, V: 0.1wt.%, Pb: 0.2wt. %, Se: 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. Inductively heat to 750 degrees to form an alloy solution, and use the electromagnetic stirring effect to fully stir for about 10 minutes. The alloy liquid is kept at 750 degrees for 10 minutes and then cast into water glass or graphite molds for casting. The ingot was subjected to deformation treatment at room temperature, and the rolling reduction in each pass was 25%. Every 3 passes of rolling requires an intermediate heat treatment to eliminate work hardening. The process is: 300 degrees for 1 hour. The final heat treatment process after rolling is: vacuum solu...

Embodiment 3

[0019] A beryllium-containing and dual-phase α+β magnesium-lithium alloy. According to the weight ratio, the composition of the alloy is: Li: 8.4wt.%, Be: 0.3wt.%, Sb: 1.6wt.%, Cr: 0.3wt.%, V: 0.1wt.%, Pb: 0.3wt. %, Se: 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. Inductively heat to 750 degrees to form an alloy solution, and use the electromagnetic stirring effect to fully stir for about 10 minutes. The alloy liquid is kept at 750 degrees for 10 minutes and then cast into water glass or graphite molds for casting. The ingot was subjected to deformation treatment at room temperature, and the rolling reduction in each pass was 25%. Every 3 passes of rolling requires an intermediate heat treatment to eliminate work hardening. The process is: 300 degrees for 1 hour. The final heat treatment process after rolling is: vacuum solu...

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Abstract

The invention discloses a beryllium containing double phase alpha+beta magnesium-lithium alloy and a processing technology thereof. The alloy is composed of the following components in percentage by weight: 6.0 to 10.0 wt.% of Li, 0.2 to 0.4 wt.% of Be, 1.0 to 3.0 wt.% of Sb, 0.2 to 0.4 wt.% of Cr, 0.1 to 0.2 wt.% of V, 0.2 to 0.4 wt.% of Pb, 0.2 to 0.3 wt.% of Se, and the balance being magnesium.The formula of the alloy is optimized, the melting technology and heat treatment parameters are also optimized, the high temperature phase and strengthening phase of the magnesium-lithium alloy are perfectly matched, and finally the multi-component magnesium-lithium alloy with a strong heatproof performance is obtained. At a room temperature, the magnesium-lithium alloy has the following indexes:yield strength: 120-145 MPa, tensile strength: 170-195 MPa, and elongation rate: 7-12%. At a temperature of 100 DEG C, the magnesium-lithium alloy has the following indexes: yield strength: 120-140 MPa, tensile strength: 165-170 MPa, and elongation rate: 12-16% The alloy melting method is simple, the production cost is low, and the alloy is suitable for industrial large scale application.

Description

technical field [0001] The invention relates to the technical field of alloys, in particular to a magnesium-lithium alloy. Background technique [0002] The density of lithium is only 0.53g / cm 3 , adding it to magnesium to form a magnesium-lithium alloy. The density of magnesium-lithium alloy is much lighter than that of general magnesium alloy (the density is usually 1.35 ~ 1.65g / cm 3 ). Compared with new materials such as steel, magnesium alloys, titanium alloys, aluminum alloys, engineering plastics, and carbon fiber composites, magnesium-lithium alloys have outstanding advantages, mainly in: (1) low density, high specific strength, and high specific modulus. The density of magnesium-lithium alloy is lower than that of common magnesium alloy, which is 1 / 2 to 3 / 5 of that of aluminum alloy. It is the smallest density among metal structural materials, and it is not much different from plastics. Its specific strength (breaking strength / density) is greater than aluminum al...

Claims

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Application Information

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