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Mg-Li-based composite material

A composite material and matrix alloy technology, applied in the field of Mg-Li-based composite materials, can solve the problems of difficult control, failure of the composite material strengthening process to reach the practical stage, process complexity, etc., and achieve the effect of improving mass ratio strength

Active Publication Date: 2013-04-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, due to the complexity of the process and the difficulty of control, the strengthening process of composite materials has not reached the practical stage. The alloy that has formed a brand is currently only LA141 (its composition ratio is Mg-14Li-1Al)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1. According to the ingredients of Mg-mLi-nB-lC, where m=33, n=25l=8, the balance is Mg.

[0015] 2. Metal Mg, Li and B 4 C powder was placed in an argon-protected resistance heating furnace and heated to 370°C.

[0016] 3. Stir the metal after melting until B 4 The C powder powder is completely immersed in it, and then cooled with the furnace; the pre-mixed alloy Mg-33Li-25B-8C is obtained;

[0017] 4. Compress the cooled ingot into 10×10×3 Mg-33Li-25B-8C fragments for later use;

[0018] 5. Press metal magnesium, metal lithium, Mg-33Li-25B-8C into Mg-14Li-1Al-6B 4 Proportion of component C: first, metal magnesium and metal lithium are heated together in an argon protection furnace to 590-610°C and melted, then Mg-33Li-25B-8C pieces are added and stirred at the same time;

[0019] 6. Stop stirring, continue to raise the temperature until 700°C, keep it warm for 30 minutes, and cool down with the furnace;

[0020] 7. After cooling, extrude at 250°C to form a round ...

Embodiment 2

[0022] 1. According to the ingredients of Mg-mLi-nB-lC, where m=25, n=30l=5, the balance is Mg.

[0023] 2. Metal Mg, Li and B 4 C powder was placed in an argon-protected resistance heating furnace and heated to 370°C.

[0024] 3. Stir the metal after melting until B 4 The C powder powder is completely immersed in it, and then cooled with the furnace; the pre-mixed alloy Mg-33Li-25B-8C is obtained;

[0025] 4. Compress the cooled ingot into 10×10×3 Mg-33Li-25B-8C fragments for later use;

[0026] 5. Press metal magnesium, metal lithium, Mg-33Li-25B-8C into Mg-15Li-6B 4 Proportion of component C: first, metal magnesium and metal lithium are heated together in an argon protection furnace to 590-610°C and melted, then Mg-33Li-25B-8C pieces are added and stirred at the same time;

[0027] 6. Stop stirring, continue to raise the temperature until 700°C, keep it warm for 45 minutes, and cool down with the furnace;

[0028] 7. After cooling, extrude at 250°C to form a round bar ...

Embodiment 3

[0030] 1. According to the ingredients of Mg-mLi-nB-lC, where m=35, n=35l=15, the balance is Mg.

[0031] 2. Metal Mg, Li and B 4 C powder was placed in an argon-protected resistance heating furnace and heated to 370°C.

[0032] 3. Stir the metal after melting until B 4 The C powder powder is completely immersed in it, and then cooled with the furnace; the pre-mixed alloy Mg-33Li-25B-8C is obtained;

[0033] 4. Compress the cooled ingot into 10×10×3 Mg-33Li-25B-8C fragments for later use;

[0034] 5. Press metal magnesium, metal lithium, Mg-33Li-25B-8C into Mg-14Li-1Al-0.5Y-7B 4 Proportion of component C: first, metal magnesium and metal lithium are heated together in an argon protection furnace to 590-610°C and melted, then Mg-33Li-25B-8C pieces are added and stirred at the same time;

[0035] 6. Stop stirring, continue to raise the temperature until 700°C, keep it warm for 60 minutes, and cool down with the furnace;

[0036] 7. After cooling, extrude at 250°C to form a ...

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Abstract

The invention discloses a Mg-Li-based composite material. The component proportion of the composite material is (Mg-xLi-uM)-yB-zC, wherein x is 5 to 18, y is 2 to 10, z is 0.5 to 3, u is 0 to 4, and M is an alloy element such as Al. The phase composition is a Mg-Li-based alloy of a body centered cubic structure; and B, C and matrix alloy form a compound reinforcing phase. The reinforcing phase has good interface bonding strength with the matrix and is dispersed in the matrix. The compound reinforced Mg-Li-based alloy ingot blank can be extruded, forced, hot-rolled and cold-rolled into corresponding bars and plates. By adopting the component proportion of Mg-xLi-uM-yB-zC, when x is 13.5 to 14.5, y is 4.4 to 7.0, z is 1.2 to 3, u is 1 and M is Al, the room temperature tensile strength of the bars obtained by extruding and forging reaches 300 to 340MPa, the density of the bars is 1.39 to 1.50 g / cm<3>, and the elongation of the bars is 8 to 15 percent. The tensile strength of the composite material is 2 times tensile strength (162MPa) of the Mg-Li-based composite material prepared in the prior art.

Description

technical field [0001] The invention discloses a Mg-Li based composite material, which belongs to the technical field of metal composite material preparation. Background technique [0002] Mg-Li based alloy is the alloy material with the highest specific strength (material strength / material density) so far. Mainly used in aerospace, aviation and other fields. Low strength and low corrosion resistance are the weaknesses of this material. At present, the method of adding trace alloy elements (Al, Zn, Ag, Y, etc.) is mainly used to strengthen the alloy. The use of composite materials to strengthen alloys with high-strength particles or fibers has always been one of the directions of the materials industry. B 4 C and B fibers are reinforcing components that can strengthen the alloy without increasing the density of the alloy too much. But at high temperature, the Mg-Li base alloy with high lithium content will corrode them, and the strengthening effect of the reinforcing com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C32/00
Inventor 刘志坚任国安杨晓亮周萍闫立奇
Owner CENT SOUTH UNIV