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High-strength and toughness magnesium-lithium alloy and method for preparing high-strength and toughness magnesium-lithium alloy by cumulative stack rolling welding process

A magnesium-lithium alloy, high-strength and toughness technology, applied in the direction of metal rolling, can solve the problem of limited improvement ability, achieve the effect of low equipment cost, increase fatigue limit, and improve alloy strength

Inactive Publication Date: 2016-08-24
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above two methods have improved the strength of magnesium-lithium alloys to a certain extent, the improvement ability is limited

Method used

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  • High-strength and toughness magnesium-lithium alloy and method for preparing high-strength and toughness magnesium-lithium alloy by cumulative stack rolling welding process
  • High-strength and toughness magnesium-lithium alloy and method for preparing high-strength and toughness magnesium-lithium alloy by cumulative stack rolling welding process
  • High-strength and toughness magnesium-lithium alloy and method for preparing high-strength and toughness magnesium-lithium alloy by cumulative stack rolling welding process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The chemical composition (mass percentage) of the alloy is: Li: 8.9%, Al: 3.4%, Zn: 1.3%, the total amount of unavoidable Fe, Cu, Ni, Mn, Si and other impurities is less than 0.03%, and the balance is Mg.

[0037] Plastic deformation processing of magnesium-lithium alloy ingot into alloy plate casting and processing technology is as follows:

[0038] a) weighing according to the proportion, and melting in a vacuum induction melting furnace to obtain the cast alloy.

[0039] b) Homogenize the as-cast alloy, the annealing temperature is 250°C, and the annealing time is 12h. The homogenized magnesium-lithium alloy ingot is rolled, the rolling temperature is 300°C, and the holding time before rolling is 1h.

[0040] c) Stress-relief annealing is performed on the heat-deformed plate, the annealing temperature is 250° C., and the annealing time is 1 h.

[0041] The processing technology of cumulative rolling of alloy plates:

[0042] d) Cut the stacked sheet to be accumula...

Embodiment 2

[0049] The chemical composition (mass percentage) of the alloy is: Li: 8.1%, Al: 3.1%, Zn: 1.2%, the total amount of unavoidable impurities such as Fe, Cu, Ni, Mn, Si, etc. is less than 0.03%, and the balance is Mg.

[0050] Plastic deformation processing of magnesium-lithium alloy ingot into alloy plate casting and processing technology is as follows:

[0051] a) weighing according to the proportion, and melting in a vacuum induction melting furnace to obtain the cast alloy.

[0052] b) Perform homogenization annealing on the as-cast alloy, the annealing temperature is 300° C., and the annealing time is 10 h. The homogenized magnesium-lithium alloy ingot was rolled, the rolling temperature was 350°C, and the holding time before rolling was 0.5h.

[0053] c) Stress-relief annealing is performed on the heat-deformed plate, the annealing temperature is 300° C., and the annealing time is 1 h.

[0054] The processing technology of cumulative rolling of alloy plates:

[0055] d)...

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Abstract

The invention provides a high-strength / toughness magnesium lithium alloy and a preparation method thereof by an accumulative roll bonding process. The method comprises the following steps: a) carrying out homogenizing treatment on a smelted magnesium lithium alloy cast ingot; b) carrying out thermal deformation processing to obtain a magnesium lithium alloy plate; c) carrying out stress-relief annealing; d) cutting the plate for accumulative roll bonding into two pieces with equal size, and carrying out surface treatment; e) fixing the two Mg-Li alloy plates; f) rolling; g) repeating the roll bonding according to the steps d)-f) 4-6 times; and h) carrying out annealing treatment. The obtained alloy comprises the following components in percentage by mass: 7.5-9.5% of Li, 2.5-3.5% of Al, 0.5-1.5% of Zn, less than 0.03% of inevitable impurities (Fe, Cu, Ni, Mn and Si), and the balance of Mg. The magnesium lithium alloy is reinforced according to the specific alloying elements and proportioning thereof, and subjected to multipass accumulative roll bonding at proper temperature to refine the magnesium lithium alloy crystal grains, so that the alloy has higher strength on the premise of keeping favorable plasticity.

Description

technical field [0001] The invention relates to a magnesium-lithium alloy material. The invention also relates to a method for preparing a high-strength and toughness magnesium-lithium alloy through a cumulative rolling welding process. Background technique [0002] Magnesium-lithium alloy is the alloy material with the smallest density so far, also known as ultra-light alloy. It has high specific strength, specific stiffness, good high and low temperature toughness, excellent damping and shock absorption, electromagnetic shielding and machining performance, etc. It is the most ideal and suitable for aerospace, automobile, 3C industry, medical equipment and other fields. It is one of the structural materials with great development potential. [0003] However, due to the inherent lattice structure characteristics of magnesium-lithium alloys, the slip system is less than other commonly used metals, and the plastic deformation ability is unstable. Moreover, due to the low ab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22F1/06B21B1/38
CPCB21B1/38B21B2001/386C22C23/00C22F1/06
Inventor 巫瑞智王天资马旭东杨金亮张景怀张密林
Owner HARBIN ENG UNIV
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