CN101914712B - Extrusion deformation process of high-strength magnesium alloy thick plate - Google Patents
Extrusion deformation process of high-strength magnesium alloy thick plate Download PDFInfo
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- CN101914712B CN101914712B CN2010102196780A CN201010219678A CN101914712B CN 101914712 B CN101914712 B CN 101914712B CN 2010102196780 A CN2010102196780 A CN 2010102196780A CN 201010219678 A CN201010219678 A CN 201010219678A CN 101914712 B CN101914712 B CN 101914712B
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Abstract
The invention relates to an extrusion deformation process of a high-strength magnesium alloy thick plate. The alloy comprises the following components in percentage by weight: 6 to 13 percent of Gd, 2 to 6 percent of Y, 0.3 to 0.8 percent of Zr and the balance of Mg and inevitable impurity elements. When the magnesium alloy is adopted to cast a blank semi-continuously, the extrusion process comprises the following steps of: homogenizing the alloy blank, quickly cooling the alloy blank, peeling off the alloy blank, heating an extrusion die to 340 to 450 DEG C, heating the alloy blank to 350 to 460 DEG C, keeping the temperature for 1 to 3 hours, and extruding the alloy blank on a 1,800T/3,600T horizontal oil hydraulic machine, wherein the extrusion ratio is 11-15.The specifications of the extruded plate include: the thickness is 10 to 35mm; the width is 50 to 80mm; and the length is more than 2,000mm. After extrusion and isothermal aging treatment, the tensile strength of the alloy is more than 460MPa, the yield strength is more than 390MPa and extension rate is more than 3 percent. The demands of the fields, such as transportation or freight tools, communications and electronics, aviation and the like, for the high-strength magnesium alloy can be satisfied; and the application range of the magnesium alloy is widened.
Description
Technical field
The present invention relates to the crimp field of magnesiumalloy, particularly a kind of extrusion deformation process of high-strength magnesium alloy thick plate.
Background technology
Magnesiumalloy is the lightest available metal structured material; Have low density, high specific strength, advantages such as thermal conductivity is good, cushioning ability is strong, be prone to cutting, recyclable and dimensional stabilizing; Have extremely important using value and wide application prospect in fields such as automobile, electronic communication, aerospace and national defense and military, be described as " 21 century green engineering material ".Magnesium is one of the abundantest element of reserves on the earth, is tending towards exhausted today in a lot of important meals, and accelerate development magnesiumalloy metallic substance is one of important measures that realize Sustainable development.Compare with cast magnesium alloys, wrought magnesium alloys has excellent comprehensive performances, higher intensity with mould, toughness, be more suitable in making large-sized structural parts and satisfying the diversified requirement of structure.The application of magnesiumalloy on large-sized structural parts is following application trend; And China's large-size high-tensile degree deformed magnesium alloy material also is in the laboratory development stage; All be lower than 350MPa with magnesium alloy strength at present; Lack the present China of the magnesium alloy plate of big specification high performance magnesium alloy board, especially intensity more than 400MPa and also be in blank.
Magnesium has the close-packed hexagonal crystalline structure, and symmetry is low, and axial ratio (c/a) value is 1.623 (near ideal solid matter values 1.633), and slip system is few under room temperature and the low temperature, and plastic deformation ability is poor, and intensity is low, has seriously limited Application of Magnesium.In all magnesium alloy plastic deformation modes, material during extrusion deformation receives three-dimensional compressive stress, can bring into play material plasticity to greatest extent, and after distortion effective refinement alloy grain, make material mechanical performance obtain raising by a relatively large margin.As seen from the above analysis, research and development intensity has the important project using value greater than the extrusion deformation process of the high-strength magnesium alloy of 400MPa to producing the high-strength magnesium alloy slab.
Summary of the invention
The object of the invention is to provide a kind of extrusion deformation process of high-strength magnesium alloy thick plate.Through designing big specification magnesium alloy plate extrusion mould; Regulate processing parameters such as ingot blank extrusion temperature, extrusion mould temperature, extrusion speed and extrusion ratio; Seek a kind of extrusion deformation process of new high-strength magnesium alloy thick plate, after final thermal treatment, make the intensity＞460MPa of magnesium alloy thick plate.
High-strength magnesium alloy of the present invention is formed (wt%) by following component:
Gd:6-13%, Y:2-6%, Zr:0.3-0.8%, Cu≤0.001%, Ni≤0.001%, Fe≤0.015%, Si≤0.01%, Mn≤0.005%, impurity≤0.10%, Mg: surplus.
Extrusion deformation process of the present invention comprises following concrete steps:
(1) the magnesiumalloy blank is carried out homogenizing and handle, fast the peeling of cooling back;
(2) add hot-extrusion mold and container, its temperature is 340 ℃-450 ℃;
(3) will pass through the magnesiumalloy blank that homogenizing is handled; Behind insulation 1-3h under 350 ℃ of-460 ℃ of temperature; Put into the container that has heated; Pushing (the blank specification is pushed on the 1800T horizontal (double action) oil hydraulic when Φ 210mm is following, and the blank specification is pushed on the 3600T horizontal (double action) oil hydraulic when Φ 210mm-310mm) on the 1800T/3600T horizontal (double action) oil hydraulic, extrusion ratio is 11-27;
(4) extruding back alloy is handled through 220 ℃/20h isothermal aging.
The mechanical property of magnesiumalloy extruded product receives condition effect such as ingot blank extrusion temperature, extrusion mould temperature, extrusion speed, extrusion ratio.Increase significantly crystal grain thinning of extrusion ratio, and that the intensity of magnesiumalloy and plasticity are influenced by grain size is particularly evident, crystal grain is more little, and its intensity and unit elongation are high more.Suitably reduce extrusion temperature and can avoid recrystal grain to grow up, thereby improve the intensity of extruded product.Characteristics of the present invention are: 1. on the basis of optimizing extrusion speed, extrusion temperature and die temperature, through utilizing the major diameter magnesium ingot, increased extrusion ratio, thereby obtained high-intensity magnesiumalloy press slab goods; Utilize the extruding of large-sized plates timber die when 2. pushing, obtain the high-strength magnesium alloy slab of tensile strength greater than 460MPa through cooperating thermal treatment process.
Description of drawings:
Fig. 1 is 450 ℃ of sheet material extruding attitude alloy optical microstructures for extrusion temperature.(a) extruding attitude alloy t * s face; (b) extruding attitude alloy s * 1; (c) extruding attitude alloy t * 1;
Fig. 2 is that 340 ℃ of sheet material extruding attitude alloy optical microstructures are real for extrusion temperature.(a) extruding attitude alloy t * s face; (b) extruding attitude alloy s * 1; (c) extruding attitude alloy t * 1;
Fig. 3 is the extrusion plate synoptic diagram;
Fig. 4 is wide 150mm, thick 20mm extrusion plate photomacrograph.
The present invention has been a large amount of contrast experiments through regulating above-mentioned parameter.Below in conjunction with accompanying drawing and embodiment the present invention is further specified.These embodiment are used to explain the present invention, rather than limitation of the present invention, conceive under the prerequisite in the present invention technology of the present invention is improved, and all belong to the scope of the present invention's protection.
Embodiment:
Embodiment 1:
Present embodiment employing magnesiumalloy semicontinuous casting blank (specification is: Φ 210mm, length is greater than 5000mm), extruding back sheet material specification is: wide 150mm, and thick 20mm, length is 3000mm, internal diameter of the container is 205mm.
The homogenizing of at first the magnesiumalloy blank being carried out 455 ℃/5h+545 ℃/15h is handled cooling back peeling fast; Then add hot-extrusion mold and container, its temperature is 450 ℃, with putting into container behind magnesiumalloy blank heating to the 460 ℃ insulation 2h, on 3600 tons of horizontal (double action) oil hydraulics, pushes then, and extrusion ratio is 11; Extruding attitude alloy optical microstructure is as shown in Figure 1, and optical microstructure can find out that complete dynamic recrystallization has taken place in extrusion process, and crystal grain is tiny, grain-size is about 13.5 μ m through the extruding vertical section; Extruded product macroscopic view picture is shown in accompanying drawing 4; Squeezing prod carries out Mechanics Performance Testing according to GB/T228-2002 after 220 ℃/20h isothermal aging is handled, the result sees table 1.
Embodiment 2:
Present embodiment employing magnesiumalloy semicontinuous casting blank (specification is: Φ 210mm, length is greater than 5000mm), extruding back sheet material specification is: wide 150mm, and thick 20mm, length is 3000mm, internal diameter of the container is 205mm.
The homogenizing of at first the magnesiumalloy blank being carried out 455 ℃/5h+545 ℃/15h is handled cooling back peeling fast; Then add hot-extrusion mold and container, its temperature is 400 ℃, with putting into container behind magnesiumalloy blank heating to the 390 ℃ insulation 2h, on 3600 tons of horizontal (double action) oil hydraulics, pushes then, and extrusion ratio is 11; Extruding attitude alloy optical microstructure is as shown in Figure 1, and optical microstructure can find out that complete dynamic recrystallization has taken place in extrusion process, and crystal grain is tiny, grain-size is about 8 μ m through the extruding vertical section, and to compare crystal grain more tiny with embodiment 1; Extruded product macroscopic view picture is shown in accompanying drawing 4; Squeezing prod carries out Mechanics Performance Testing according to GB/T228-2002 after 220 ℃/20h isothermal aging is handled, the result sees table 2.
Table 1 embodiment 1 extrusion plate room temperature tensile mechanical property
Table 2 embodiment 2 extrusion plate room temperature tensile mechanical properties
Claims (3)
1. the extrusion deformation process of a high-strength magnesium alloy thick plate, the weight percent composition of each composition of alloy is than being Gd:6-13%, Y:2-6%; Zr:0.3-0.8%, Cu≤0.001%, Ni≤0.001%; Fe≤0.015%, Si≤0.01%, Mn≤0.005%; Impurity≤0.10%, all the other are Mg, may further comprise the steps:
A. the magnesiumalloy blank is carried out homogenizing and handle, fast the peeling of cooling back;
B. add hot-extrusion mold and container, make its temperature remain on 340 ℃-450 ℃;
The magnesiumalloy blank that c. will pass through the homogenizing processing is behind insulation 1-3h under 350 ℃ of-460 ℃ of temperature; Put into pre-heated container; On horizontal oil pressure extrusion machine, push, extrusion ratio is 11-17, and extruding back sheet material specification is: thick 10mm-35mm; Wide 50mm-180mm, length is greater than 2000mm;
D. extruding back alloy is through the thermal treatment of 220 ℃/20h isothermal aging.
2. according to the said high-strength magnesium alloy thick plate extrusion deformation process of claim 1, it is characterized in that: used blank is a magnesiumalloy semicontinuous casting blank, and specification is Φ 97-310mm, and length is greater than 5000mm.
3. according to the said high-strength magnesium alloy thick plate extrusion deformation process of claim 1; It is characterized in that: the blank specification is pushed on the 1800T horizontal (double action) oil hydraulic when Φ 210mm is following, and the blank specification is pushed on the 3600T horizontal (double action) oil hydraulic when Φ 210mm-310mm.
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| CN2010102196780A CN101914712B (en) | 2010-07-07 | 2010-07-07 | Extrusion deformation process of high-strength magnesium alloy thick plate |
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| CN2010102196780A CN101914712B (en) | 2010-07-07 | 2010-07-07 | Extrusion deformation process of high-strength magnesium alloy thick plate |
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| CN101914712B true CN101914712B (en) | 2012-01-04 |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103619506B (en) * | 2011-06-28 | 2016-01-20 | 国立大学法人电气通信大学 | Magnesium alloy materials manufacture method and magnesium alloy bar |
| CN102828134B (en) * | 2012-09-20 | 2014-08-13 | 中南大学 | Three-level aging heat treatment process for nanometer magnesium alloy |
| CN102828133B (en) * | 2012-09-20 | 2014-04-16 | 中南大学 | Method for preparing ultrahigh strength high toughness magnesium alloy |
| CN103014468A (en) * | 2012-12-20 | 2013-04-03 | 常熟市东方特种金属材料厂 | Magnesium-gadolinium-yttrium alloy |
| CN103447432B (en) * | 2013-09-04 | 2015-09-09 | 中南大学 | A kind of isothermal forging process of large scale magnesium alloy parts |
| CN103774069B (en) * | 2014-01-18 | 2016-01-13 | 中南大学 | A kind of forging and forming technology of large size high-strength heat-resistant magnesium alloy slab |
| CN103769817B (en) * | 2014-01-18 | 2016-01-20 | 中南大学 | A kind of forming technology of major diameter high-strength heat-resistant magnesium alloy thick walled cylinder parts |
| CN103878195B (en) * | 2014-03-31 | 2016-02-10 | 重庆市科学技术研究院 | Magnesium alloy plate extruding formation process |
| CN104846245B (en) * | 2014-11-21 | 2017-02-01 | 北汽福田汽车股份有限公司 | Magnesium-lithium alloy electrochemical property control method and magnesium-lithium alloy |
| CN105714168A (en) * | 2016-03-25 | 2016-06-29 | 中国兵器科学研究院宁波分院 | High-yield-strength magnesium alloy and preparation method thereof |
| CN106944799A (en) * | 2017-03-23 | 2017-07-14 | 中南大学 | AQ80M magnesium alloys annular element squeezes forging rolling integrated technique |
| CN106929724B (en) * | 2017-03-23 | 2018-08-14 | 中南大学 | AQ80M magnesium alloy Wide and Thick Slab hot extrusion techniques |
| CN106890865B (en) * | 2017-03-23 | 2018-08-21 | 中南大学 | Major diameter AQ80M magnesium alloy cake materials squeeze forging and integrate forming technology |
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| JP3732600B2 (en) * | 1996-11-15 | 2006-01-05 | 株式会社セイタン | Yttrium-containing magnesium alloy |
| CN101191168B (en) * | 2006-11-23 | 2011-03-30 | 北京有色金属研究总院 | Magnesium alloy and preparation method thereof |
| CN100436624C (en) * | 2007-06-22 | 2008-11-26 | 西安工业大学 | High-intensity thermal deformation resistant magnesium alloy |
| US7708937B2 (en) * | 2008-04-17 | 2010-05-04 | Changchun Institute Of Applied Chemistry Chinese Academy Of Sciences | High-strength, high-toughness, weldable and deformable rare earth magnesium alloy |
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