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High-strength Mg-Li-Al-Y-Ca alloy and preparation method thereof

A high-strength, calcium alloy technology, applied in the field of metal materials, can solve the problems of low strength and low-density plasticity, and achieve the effects of improving mechanical properties, easy industrial production, and simple processing technology.

Inactive Publication Date: 2017-03-22
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the Li content is higher than 10.3wt%, the matrix phase is a body-centered cubic β-Li solid solution formed by Mg dissolved in Li. This type of alloy has a significant weight reduction effect, has a very low density and good plasticity, but low intensity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Preparation of high-strength magnesium-lithium-aluminum-yttrium-calcium alloy.

[0028] The high-strength magnesium-lithium-aluminum-yttrium-calcium alloy of this embodiment comprises the following components in weight percent: 92.49wt% of Mg, 4wt% of Li, 2wt% of Al, 1wt% of Y, 0.5wt% Ca, a total amount of 0.01wt% impurity elements Si, Fe, Cu and Ni (wt% refers to the percentage of the weight of each component in the total weight of the target alloy, the total weight is Mg, Li, Al and various intermediate total weight of the alloy).

[0029] The preparation method of the high-strength magnesium-lithium-aluminum-yttrium-calcium alloy is as follows:

[0030] Melting process: the whole melting process is in SF 6 / CO 2 Under the condition of mixed gas protection. Take by weighing pure Mg, pure Al, Mg-Y intermediate alloy (Mg-25wt%Y alloy, also known as Mg-Y25 alloy or Mg-25Y alloy, the weight of Y accounts for the total weight of Mg-25wt%Y alloy 25%, the wei...

Embodiment 2

[0034] Example 2: Preparation of high-strength magnesium-lithium-aluminum-yttrium-calcium alloy.

[0035] The high-strength magnesium-lithium-aluminum-yttrium-calcium alloy of this embodiment contains the following components by weight percentage: 84.985wt% of Mg, 8wt% of Li, 4wt% of Al, 2wt% of Y, 1wt% of Ca, the impurity elements Si, Fe, Cu and Ni (wt%) that the total amount is 0.015wt% (wt% refers to the percentage that the weight of each component accounts for the total weight of target alloy, and this total weight is Mg, Li, Al and various master alloys total weight).

[0036] The preparation method of the high-strength magnesium-lithium-aluminum-yttrium-calcium alloy is as follows:

[0037] Melting process: the whole melting process is in SF 6 / CO 2 Under the condition of mixed gas protection. Take by weighing pure Mg, pure Al, Mg-Y intermediate alloy (Mg-25wt%Y alloy, also known as Mg-Y25 alloy or Mg-25Y alloy, the weight of Y accounts for the total weight of Mg-25wt%...

Embodiment 3

[0041] Example 3: Preparation of high-strength magnesium-lithium-aluminum-yttrium-calcium alloy.

[0042] The high-strength magnesium-lithium-aluminum-yttrium-calcium alloy of this embodiment comprises the following components in weight percent: 77.492wt% of Mg, 12wt% of Li, 6wt% of Al, 3wt% of Y, 1.5wt% Ca, a total amount of 0.008wt% impurity elements Si, Fe, Cu and Ni (wt% refers to the percentage of the weight of each component in the total weight of the target alloy, the total weight is Mg, Li, Al and various intermediate total weight of the alloy).

[0043] The preparation method of the high-strength magnesium-lithium-aluminum-yttrium-calcium alloy is as follows:

[0044] Melting process: the whole melting process is in SF 6 / CO 2 Under the condition of mixed gas protection. Take by weighing pure Mg, pure Al, Mg-Y intermediate alloy (Mg-25wt%Y alloy, also known as Mg-Y25 alloy or Mg-25Y alloy, the weight of Y accounts for the total weight of Mg-25wt%Y alloy 25%, the ...

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Abstract

The invention belongs to the technical field of metal materials and relates to a high-strength Mg-Li-Al-Y-Ca alloy and a preparation method thereof. The alloy is prepared from components in percentage by weight as follows: 4wt%-12wt% of Li, 2wt%-6wt% of Al, 1wt%-3wt% of Y, 0.5wt%-1.5wt% of Ca and the balance of Mg and impurity elements including Si, Fe, Cu and Ni, and the total quantity of the impurity elements is smaller than 0.02wt%. The alloy is prepared with the method comprising steps as follows: (1) material baking, (2) material addition, (3) casting, (4) plastic deformation, and (5) heat treatment technology. Certain mass of Y elements and certain mass of Ca elements are added to a Mg-Li-Al alloy, a strengthening phase having the high heat stability is introduced into an alloy solidification structure; meanwhile, the solidification structure is promoted to be refined; and the high-strength Mg-Li-Al-Y-Ca alloy has the relatively low density and the excellent mechanical property through plastic deformation and the heat treatment technology.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and relates to a magnesium alloy and a preparation method thereof, in particular to a high-strength magnesium-lithium-aluminum-yttrium-calcium alloy and a preparation method thereof. Background technique [0002] Magnesium (Mg) alloy has the advantages of low density, wide range of sources, high specific strength and specific stiffness, etc., and is known as "the green engineering material of the 21st century". By adding lithium (Li) to the magnesium alloy and alloying it, the density of the magnesium alloy can be further reduced and its plasticity can be improved, so it has broad application prospects in the fields of aviation and aerospace that require high weight reduction. At present, a major problem restricting the application of magnesium-lithium alloys is the low strength, which is difficult to meet the requirements of engineering applications. Therefore, the development of new hi...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22C23/02C22C1/03C22F1/06
CPCC22C23/00C22C1/03C22C23/02C22F1/06
Inventor 张扬封爱成杨梅李小平卢雅琳
Owner JIANGSU UNIV OF TECH
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