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High-strength high-ductility Mg-Ga-Li-series magnesium alloy capable of quickly realizing ageing strengthening and preparation method thereof

A technology of aging strengthening and magnesium alloy, which is applied to the improvement of process efficiency, additive manufacturing, energy efficiency, etc., can solve the problems of aging strengthening effect description, etc., and achieve the effect of high strengthening efficiency and good biocompatibility

Active Publication Date: 2020-04-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solution aging heat treatment was carried out in the preparation and processing method of this material, but the aging strengthening effect was not explained

Method used

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  • High-strength high-ductility Mg-Ga-Li-series magnesium alloy capable of quickly realizing ageing strengthening and preparation method thereof
  • High-strength high-ductility Mg-Ga-Li-series magnesium alloy capable of quickly realizing ageing strengthening and preparation method thereof
  • High-strength high-ductility Mg-Ga-Li-series magnesium alloy capable of quickly realizing ageing strengthening and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: Plastic deformation strengthening of Mg-Ga-Li ternary magnesium alloy

[0037] The process route is as follows: casting → homogenization heat treatment → extrusion → annealing → finished material.

[0038] The compositions of the inventive alloys 1-10 are within the following ranges: the Ga content is 3-8.5%, the Li content is 0.5-3%, and the rest is Mg, as shown in Table 1-1. Inventive example alloys use pure magnesium, pure gallium and Mg-Li intermediate alloys as raw materials, put them into a vacuum induction heating furnace according to the composition ratio of Table 1-1, then vacuumize and feed inert gas, and start to heat up after the air pressure is stable, at 680 Refining at ~750°C for 5-20 minutes, casting, cooling to obtain ingots. Carry out homogenization heat treatment on the slab, and the process system is 250-500 ° C for 1-48 hours. Then squeeze it. The extrusion temperature is 150-450° C., the single-pass extrusion ratio is 10-90, 2-10 p...

Embodiment 2

[0043] Example 2: Rapid aging strengthening of Mg-Ga-Li quaternary magnesium alloy additive manufacturing shaped materials

[0044] The process route is as follows: casting→homogenizing heat treatment→additive manufacturing (3D printing)→rapid aging→finished material.

[0045] The composition of the inventive alloys 11-18 is within the following ranges: the Ga content is 3-8.5%, the Li content is 0.5-3%, and the rest is Mg. On this basis, a trace alloying element is further added, as shown in Table 2 -1 shown. The alloy composition in the table is expressed according to the international practice, and the alloy composition of Invention Example 11 is illustrated, the content of Ga is 3%, the content of Li is 0.8%, the content of Ce is 0.1%, and the balance is Mg. Among them, Mg, Sn and Ce elements are added as pure substances, and Li is added as Mg-Li master alloy. Inventive example alloys described in the table were made into ingots according to the process system in Example...

Embodiment 3

[0050] Example 3: Solid solution rapid aging strengthening of Mg-Ga-Li series quaternary magnesium alloy forged into profiles

[0051] The process route is as follows: casting→homogenizing heat treatment→forging→solid solution→quenching→rapid aging→finished material.

[0052] The composition of the inventive alloys 19-30 is within the following range: the Ga content is 3-8.5%, the Li content is 0.5-3%, and the rest is Mg. On this basis, a trace alloying element is further added, as shown in Table 3 -1 shown. Except that Li is added as Mg-Li master alloy, other elements are added in the form of pure substances. Inventive example alloys described in the table were made into ingots according to the process system in Example 1 and subjected to homogenization heat treatment. Then forging is carried out, the forging temperature is 250-450° C., and the deformation amount is 10-90%, so as to obtain a forged profile. Then solid solution quenching is carried out, and the process syst...

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Abstract

The invention provides a high-strength high-ductility Mg-Ga-Li-series magnesium alloy capable of quickly realizing ageing strengthening and a preparation method thereof. The alloy is prepared from thefollowing components in percentage by weight: 3-8.5% of Ga, 0.5-3% of Li and the balance Mg; and the alloy further can contain at least one of Zn, Ca, Sr, Si, Zr, a rare-earth element Re, Mn, Ag, Cuand Na. The alloy provided by the invention can be quickly formed by an additive manufacturing (3D printing) technology, further can be subjected to solid-solution thermal treatment to obtain an Mg-based supersaturated solid solution, and can achieve an ageing strengthening value within 20 hours through quick aging thermal treatment. The high-strength high-ductility Mg-Ga-Li-series magnesium alloyhas room-temperature tensile yield strength higher than 200 MPa, and has elongation higher than 10%. The alloy takes a Mg-Ga-Li ternary phase of a nano scale as a main precipitated phase, is remarkable in ageing strengthening effect, is good in overall performance, and further can be used as a biomedical material for manufacturing a body implant medical device except from being used as a common structure and a high-temperature creep-resistant material.

Description

technical field [0001] The invention relates to a composition design and preparation method of a high-strength and high-plasticity Mg-Ga-Li magnesium alloy, in particular to a high-strength and high-plasticity Mg-Ga-Li that can be manufactured (3D printing) and can be strengthened by rapid aging The invention relates to composition design and preparation method of magnesium alloy, belonging to the field of non-ferrous metal materials and metallurgy. Background technique [0002] Mg and its alloys are one of the lightest structural materials, with high specific strength and specific stiffness, good damping and shock absorption performance, and good biocompatibility, and are widely used in automotive, aerospace, medical devices and other fields. The matrix of Mg and most of its alloys is a close-packed hexagonal structure, which has poor deformation ability at room temperature, high processing cost, and low yield. In addition, the lower strength, corrosion resistance and heat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22F1/06C22C1/04B22F3/105A61L31/02A61L31/14B33Y10/00B33Y80/00
CPCC22C23/00C22F1/06C22F1/002C22C1/0408A61L31/022A61L31/14B33Y10/00B33Y80/00B22F10/00B22F10/28B22F10/64B22F10/18B22F10/25Y02P10/25
Inventor 石章智陈虹廷刘雪峰戴付志张柯
Owner UNIV OF SCI & TECH BEIJING
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