CN101914712A - Extrusion deformation process of high-strength magnesium alloy thick plate - Google Patents
Extrusion deformation process of high-strength magnesium alloy thick plate Download PDFInfo
- Publication number
- CN101914712A CN101914712A CN 201010219678 CN201010219678A CN101914712A CN 101914712 A CN101914712 A CN 101914712A CN 201010219678 CN201010219678 CN 201010219678 CN 201010219678 A CN201010219678 A CN 201010219678A CN 101914712 A CN101914712 A CN 101914712A
- Authority
- CN
- China
- Prior art keywords
- alloy
- magnesium alloy
- blank
- extrusion
- strength
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 43
- 238000001125 extrusion Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000000956 alloy Substances 0.000 claims abstract description 22
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 21
- REDXJYDRNCIFBQ-UHFFFAOYSA-N aluminium(3+) Chemical class data:image/svg+xml;base64,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 data:image/svg+xml;base64,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 [Al+3] REDXJYDRNCIFBQ-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000011777 magnesium Substances 0.000 claims abstract description 7
- 230000032683 aging Effects 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 229910052727 yttrium Inorganic materials 0.000 claims abstract description 3
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 10
- 238000001192 hot extrusion Methods 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 3
- 238000007669 thermal treatment Methods 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 2
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 238000004642 transportation engineering Methods 0.000 abstract 1
- 230000003287 optical Effects 0.000 description 6
- 229910052749 magnesium Inorganic materials 0.000 description 5
- 230000018109 developmental process Effects 0.000 description 4
- 235000012438 extruded product Nutrition 0.000 description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N magnesium Chemical compound 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[Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 4
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- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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- 239000002184 metal Substances 0.000 description 1
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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 magnesium alloy, particularly a kind of extrusion deformation process of high-strength magnesium alloy thick plate.
Background technology
Magnesium alloy is the lightest available metal structured material, have low density, high specific strength, advantages such as thermal conductivity is good, cushioning ability is strong, easily 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 magnesium alloy 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 and mould, toughness, be more suitable in making large-sized structural parts and satisfying the diversified requirement of structure.The application of magnesium alloy 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, now all be lower than 350MPa with magnesium alloy strength, 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 is subjected to 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 by a relatively large margin raising.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.By 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 magnesium alloy 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 be through the magnesium alloy blank of homogenizing processing, behind insulation 1-3h under 350 ℃ of-460 ℃ of temperature, put into the container that has heated, (the blank specification is pushed on the 1800T horizontal (double action) oil hydraulic when Φ 210mm is following pushing on the 1800T/3600T horizontal (double action) oil hydraulic, the blank specification is pushed on the 3600T horizontal (double action) oil hydraulic when Φ 210mm-310mm), extrusion ratio is 11-27;
(4) extruding back alloy is handled through 220 ℃/20h isothermal aging.
The mechanical property of magnesium alloy extruded product is subjected to 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 magnesium alloy 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, by utilizing the major diameter magnesium ingot, increased extrusion ratio, thereby obtained high-intensity magnesium alloy 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 by 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 by regulating above-mentioned parameter.The present invention is further described below in conjunction with drawings and Examples.These embodiment are used to illustrate 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 protection of the invention.
Embodiment:
Embodiment 1:
Present embodiment employing magnesium alloy 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.
At first the magnesium alloy blank is carried out the homogenizing of 455 ℃/5h+545 ℃/15h and handle, fast the peeling of cooling back; Then add hot-extrusion mold and container, its temperature is 450 ℃, with putting into container behind magnesium alloy blank heating to the 460 ℃ insulation 2h, pushes on 3600 tons of horizontal (double action) oil hydraulics then, and extrusion ratio is 11; Extruding attitude alloy optical microstructure by extruding vertical section optical microstructure as can be seen, complete dynamic recrystallization has taken place, and crystal grain is tiny as shown in Figure 1 in extrusion process, grain-size is about 13.5 μ m; Extruded product macroscopic view picture as shown in Figure 4; Squeezing prod carries out Mechanics Performance Testing according to GB/T228-2002 after 220 ℃/20h isothermal aging is handled, the results are shown in Table 1.
Embodiment 2:
Present embodiment employing magnesium alloy 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.
At first the magnesium alloy blank is carried out the homogenizing of 455 ℃/5h+545 ℃/15h and handle, fast the peeling of cooling back; Then add hot-extrusion mold and container, its temperature is 400 ℃, with putting into container behind magnesium alloy blank heating to the 390 ℃ insulation 2h, pushes on 3600 tons of horizontal (double action) oil hydraulics then, and extrusion ratio is 11; Extruding attitude alloy optical microstructure by extruding vertical section optical microstructure as can be seen, complete dynamic recrystallization has taken place, and crystal grain is tiny as shown in Figure 1 in extrusion process, grain-size is about 8 μ m, and to compare crystal grain more tiny with embodiment 1; Extruded product macroscopic view picture as shown in Figure 4; Squeezing prod carries out Mechanics Performance Testing according to GB/T228-2002 after 220 ℃/20h isothermal aging is handled, the results are shown in 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 and the impurity element that can not remove, may further comprise the steps:
A. the magnesium alloy 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 ℃;
C. the magnesium alloy blank that will handle through homogenizing 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, 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 described high-strength magnesium alloy thick plate extrusion deformation process of claim 1, it is characterized in that: used blank is a magnesium alloy semicontinuous casting blank, and specification is Φ 97-310mm, and length is greater than 5000mm.
3. according to the described 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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| CN102828133A (en) * | 2012-09-20 | 2012-12-19 | 中南大学 | Method for preparing ultrahigh strength high toughness magnesium alloy |
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