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Low-rare-earth high-strength wrought magnesium alloy containing neodymium and yttrium and preparation method of low-rare-earth high-strength wrought magnesium alloy

A deformed magnesium alloy, high-strength technology, applied in the field of magnesium alloys, can solve the problems of poor yield strength and poor strength of deformed magnesium alloys, and achieve the effects of increasing strength, hindering growth, and facilitating popularization and application

Inactive Publication Date: 2021-03-09
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a low-cost low-rare-earth high-strength magnesium alloy, which can solve the problem of poor strength of existing deformed magnesium alloys, especially those with poor yield strength, on the basis of reducing the cost as much as possible. question

Method used

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  • Low-rare-earth high-strength wrought magnesium alloy containing neodymium and yttrium and preparation method of low-rare-earth high-strength wrought magnesium alloy
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  • Low-rare-earth high-strength wrought magnesium alloy containing neodymium and yttrium and preparation method of low-rare-earth high-strength wrought magnesium alloy

Examples

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Effect test

Embodiment 1

[0023] Example 1: The low rare earth magnesium alloy containing neodymium and yttrium in this example includes (percentage by weight): Zn 5.67wt.%, Zr 0.47wt.%, Nd 0.45wt.%, Y 0.72wt. %, unavoidable impurities <0.10wt.%; the balance is Mg.

[0024] Its preparation method comprises the following steps:

[0025] a) Alloy melting and casting:

[0026] Casting by semi-continuous method, first put pure magnesium in a stainless steel crucible and preheat it to 200 ° C with the furnace, keep it for 1 hour; then pass in protective gas, in SF 6 +CO 2 Under the protection of gas, the induction furnace is heated up and melted; after the pure magnesium is melted, the temperature of the melt is raised to 720°C, and the preheated and dried Mg-Y and Mg-Nd master alloys are added to the magnesium melt. When adding, the intermediate alloy block should quickly enter below the liquid surface, and stir evenly after melting; when the temperature rises to 690°C, add pure zinc particles according...

Embodiment 2

[0031] Embodiment 2: The low rare earth magnesium alloy containing neodymium and yttrium in this embodiment includes the following components by weight percentage: Zn5.70wt.%, Zr 0.64 wt.%, Nd 0.48 wt.%, Y 0.73 wt.%, unavoidable Impurities <0.10wt.%; the balance is Mg.

[0032] Its alloy smelting and casting-machining-homogenization-hot extrusion-aging treatment methods are the same as in Example 1.

Embodiment 3

[0033] Embodiment 3: The low rare earth magnesium alloy containing neodymium and yttrium in this embodiment includes the following components by weight percentage: Zn6.40wt.%, Zr 0.59 wt.%, Nd 0.46 wt.%, Y 1.00 wt.%, unavoidable Impurities <0.10wt.%; the balance is Mg.

[0034] The method of alloy smelting and casting-machining-homogenization-hot extrusion-aging treatment is the same as that of Example 1, except that the extrusion ratio is 10:1.

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Abstract

The invention provides a high-strength wrought magnesium alloy containing rare earth neodymium and yttrium. The alloy comprises the following components in percentages by mass: 5.50-6.50wt.% of Zn, 0.47-0.80wt.% of Zr, 0.45-0.50wt.% of Nd, 0.72-1.00wt.% of Y, less than 0.10wt.% of inevitable impurities and the balance of Mg. A preparation method comprises the following steps: homogenizing a magnesium alloy ingot containing rare earth neodymium and yttrium, and then performing hot extrusion. Crystal grains are remarkably refined, meanwhile, neodymium, yttrium and elements such as magnesium andzinc in the alloy form second phases, and the second phases are re-crushed and distributed into fine dispersed strengthening phases in the hot extrusion process, so that growth of recrystallized crystal grains in the hot deformation process can be effectively hindered, a matrix is strengthened, and good mechanical properties can be obtained; and after hot extrusion, low-temperature aging treatmentis performed, so that the strength can be further improved, and the tensile strength after aging exceeds 400 MPa and is higher than that of most commercial magnesium alloys at present. The alloy is low in cost, a conventional smelting hot extrusion process is adopted, and the alloy has good operability and practicability and is convenient to popularize and apply.

Description

technical field [0001] The invention relates to a magnesium alloy, in particular to a low-rare-earth high-strength deformable magnesium alloy containing neodymium and yttrium and a preparation method thereof. Background technique [0002] Magnesium alloy has the advantages of low density, good thermal and electrical conductivity, high specific strength and specific modulus, and has abundant magnesium reserves and is easy to recycle, so it has received more and more attention in the field of metal structural materials. The recovery of magnesium alloy is relatively simple, and its corrosion products will not pollute the atmospheric environment and land environment. Magnesium's low density reduces vehicle weight, which improves fuel efficiency and reduces greenhouse gas emissions. This is the reason why magnesium alloy materials are called "green metal structural engineering materials in the 21st century". However, due to the low absolute strength and poor plastic deformation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/04C22C1/03C22F1/06C21D8/06C21D9/00C21D1/773C22F1/02
CPCC21D1/773C21D8/06C21D9/0075C22C1/03C22C23/04C22F1/02C22F1/06
Inventor 陈先华王子怡李建波潘复生
Owner CHONGQING UNIV
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