CN104862568A - High-strength rare earth metal wrought magnesium alloy - Google Patents
High-strength rare earth metal wrought magnesium alloy Download PDFInfo
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- CN104862568A CN104862568A CN201510332723.6A CN201510332723A CN104862568A CN 104862568 A CN104862568 A CN 104862568A CN 201510332723 A CN201510332723 A CN 201510332723A CN 104862568 A CN104862568 A CN 104862568A
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Abstract
The invention relates to a technology of magnesium alloys, in particular to a high-strength rare earth metal wrought magnesium alloy and a preparation method thereof. The high-strength rare earth metal wrought magnesium alloy comprises the following composition ingredients in percent by weight: 5-6 percent of Zn, 1-3 percent of Al, 0.3-0.7 percent of Ce, 0.3-0.7 percent of Sn, less than or equal to 0.15 percent of inevitable impurities, and the balance of Mg. Through the addition of Ce and Sn, the performance of the high-strength rare earth metal wrought magnesium alloy is improved effectively, the tensile strength is up to 312-345 MPa, the yield strength is up to 203-268 MPa, the elongation is up to 11-19 percent, and the high-strength rare earth metal wrought magnesium alloy has the advantages of being simple in process, convenient to operate, and low in cost.
Description
Technical field
The present invention relates to magnesium alloy materials, particularly a kind of Mg-Zn-Al-Ce-Sn alloy, and the preparation method of this alloy material.
Background technology
In engineering metal material, the most outstanding feature of magnesium material is that quality is light.Magnesium alloy has specific tenacity, specific rigidity is high, and damping property is good, the series of advantages such as capability of resistance to radiation is strong, is following very important structural metallic materials and functional materials.Along with countries in the world are more and more paid attention to the energy and environment protection, there is new situation in the research and development of magnesium, and magnesium material becomes the new engineering material emerged rapidly.
In Mg-Zn system alloy, Zn is main constituent element, and the maximum solid solution degree of Zn in magnesium is 6.2%, and temperature decline solid solubility reduces, can heat treatment reinforcement.Zinc in alloy has the dual function of solution strengthening and ageing strengthening, and when Zn content is 5 ~ 6%, alloy strength reaches maximum.Under room temperature, the solid solubility of Al in Mg is about 2%, and a small amount of Al has the effect of solution strengthening.
Rare-Earth Ce has very wholesome effect to magnesium alloy, not only constitute Mg-Re alloy system, and to Mg-Al, the alloy systems such as Mg-Zn all have to be affected very significantly, and its Main Function has: crystal grain thinning, purification melt, raising Alloy At Room Temperature intensity, the thermostability improving alloy mechanical property, raising alloy corrosion resistance energy etc.
Interpolation Sn is combined with a small amount of aluminium is in the magnesium alloy very useful, and Sn can improve the ductility of magnesium alloy, reduces tearing tendency during hot-work.
Summary of the invention
The invention provides a kind of rare earth wrought magnesium alloys with high strength.
The technical side that the present invention adopts is as follows: a kind of high-strength rare earth wrought magnesium alloys Mg-Zn-Al-Ce-Sn, and by mass percentage, its moiety is: Zn:5 ~ 6%; Al:1 ~ 3%; Ce:0.3 ~ 0.7%; Sn:0.3 ~ 0.7%; Inevitable impurity≤0.15%; All the other are magnesium.
As a kind of optimal way of the present invention, the mass percent of zinc, aluminium, cerium, tin is: Zn:5.7%; Al:2.2%; Ce:0.60%; Sn:0.45%
High-strength magnesium alloy material of the present invention, through casting rod, homogenizing, extruding, solid solution+ageing treatment, tensile strength reaches 312-345MPa, and yield strength reaches 203-268MPa, and unit elongation reaches 11-19%.
Owing to the addition of rare earth element ce in magnesium alloy materials of the present invention, not only the refinement tissue of alloy, improves the castability of alloy, and hinder growing up of recrystal grain in follow-up deformation process, refinement Deformation structure, put forward heavy alloyed mechanical property.Sn can improve the ductility of magnesium alloy, reduces tearing tendency during hot-work.Therefore, magnesium alloy of the present invention is applicable to extrusion molding.
Meanwhile, the present invention also provides a kind of preparation method of high-strength rare earth wrought magnesium alloys, and what adopt in the method is component, the content of above-described magnesium alloy, comprises step:
(1) melt: be placed in iron ware by magnesium ingot and melt, melting process adopts SO2+SF6 gas shield.
(2) alloying: be warming up to 660-670 DEG C and add aluminium, zinc, tin, is warming up to 740-760 DEG C and adds cerium; Blowing argon gas stirs to ensure being uniformly distributed of alloying element.
(3) refining: add refining agent when 720-750 DEG C, refining time 20min.
(4) cooling is left standstill: after refining completes with at 660-690 DEG C, leave standstill 40min; ;
(5) semicontinuous casting rod: be warming up to 700-720 DEG C and carry out semicontinuous casting rod;
(6) extrusion processing: after casting rod is incubated 12 hours Homogenization Treatments at 330 DEG C, dispute over trifles, the ingot casting of disputing over trifles is carried out at temperature 370-380 DEG C deformation processing and become goods.
(7) fixation rates: 420 DEG C of solution treatment in * 2 hours, 180 DEG C of * 16 hours ageing treatment.
Magnesium alloy materials of the present invention adopts the founding of conventional foundry ingot preparation means, and technique is simple, has industrial application and is worth, and makes existing industrial condition just direct production can go out high-strength deformation magnesium-rare earth.Extrude in general industryization, roll, just can deformation processing on the deformation processing equipment such as forging, there is simple, the easy to operate and advantage that cost is low of technique.
Embodiment
Embodiment 1:
High-strength rare earth wrought magnesium alloys, is made up of the raw material of following mass percent: zinc 5.9%, aluminium 3.0%, cerium 0.65%, tin 0.65%, and surplus is magnesium and impurity.Preparation method's method of high-strength rare earth wrought magnesium alloys, adopts following steps: a, is melted in iron ware by magnesium ingot, and melting process adopts SO2+SF6 gas shield; B, be warming up to 665 DEG C subsequently and add aluminium, zinc, tin successively, 740-760 DEG C adds cerium; C, magnesium alloy fused mass add refining agent blowing argon gas and stir refining 20 minutes 735 DEG C time, are cooled to 680 DEG C of standing 40min; D, magnesium alloy fused mass is warming up to 715 DEG C carries out semicontinuous casting rod, casting rod diameter of phi 136mm; E, be incubated at casting rod 330 DEG C after 12 hours Homogenization Treatments, dispute over trifles to diameter of phi 130mm, the ingot casting of disputing over trifles is squeezed into the bar that diameter is Φ 25mm at temperature 375 DEG C.F.420 DEG C solution treatment in * 2 hours, 180 DEG C of * 16 hours ageing treatment.After the timeliness of the bar obtained after adopting above-mentioned technique to extrude, the room temperature tensile properties of bar is: tensile strength >=312MPa, yield strength >=228MPa, unit elongation >=16%.
Embodiment 2:
High-strength rare earth wrought magnesium alloys, is made up of the raw material of following mass percent: zinc 5.2%, aluminium 1.2%, cerium 0.35%, tin 0.35%, and surplus is magnesium and impurity.Preparation method's method of high-strength rare earth wrought magnesium alloys, adopts following steps: a, is melted in iron ware by magnesium ingot, and melting process adopts SO2+SF6 gas shield; B, be warming up to 665 DEG C subsequently and add aluminium, zinc, tin successively, 740-760 DEG C adds cerium; C, magnesium alloy fused mass add refining agent blowing argon gas and stir refining 20 minutes 738 DEG C time, are cooled to 683 DEG C of standing 40min; D, magnesium alloy fused mass is warming up to 712 DEG C carries out semicontinuous casting rod, casting rod diameter of phi 136mm; E, be incubated at casting rod 330 DEG C after 12 hours Homogenization Treatments, dispute over trifles to diameter of phi 130mm, the ingot casting of disputing over trifles is squeezed into the bar that diameter is Φ 25mm at temperature 378 DEG C.F.420 DEG C solution treatment in * 2 hours, 180 DEG C of * 16 hours ageing treatment.After the timeliness of the bar obtained after adopting above-mentioned technique to extrude, the room temperature tensile properties of bar is: tensile strength >=305MPa, yield strength >=203MPa, unit elongation >=11%.
Embodiment 3:
High-strength rare earth wrought magnesium alloys, is made up of the raw material of following mass percent: zinc 5.7%, aluminium 2.2%, cerium 0.60%, tin 0.45%, and surplus is magnesium and impurity.Preparation method's method of high-strength rare earth wrought magnesium alloys, adopts following steps: a, is melted in iron ware by magnesium ingot, and melting process adopts SO2+SF6 gas shield; B, be warming up to 665 DEG C subsequently and add aluminium, zinc, tin successively, 740-760 DEG C adds cerium; C, magnesium alloy fused mass add refining agent blowing argon gas and stir refining 20 minutes 732 DEG C time, are cooled to 675 DEG C of standing 40min; D, magnesium alloy fused mass is warming up to 717 DEG C carries out semicontinuous casting rod, casting rod diameter of phi 136mm; E, be incubated at casting rod 330 DEG C after 12 hours Homogenization Treatments, dispute over trifles to diameter of phi 130mm, the ingot casting of disputing over trifles is squeezed into the bar that diameter is Φ 25mm at temperature 374 DEG C.F.420 DEG C solution treatment in * 2 hours, 180 DEG C of * 16 hours ageing treatment.After the timeliness of the bar obtained after adopting above-mentioned technique to extrude, the room temperature tensile properties of bar is: tensile strength is σ
b=345MPa, yield strength σ
0.2=268MPa, unit elongation is δ=19%.
Embodiment 4:
High-strength rare earth wrought magnesium alloys, is made up of the raw material of following mass percent: zinc 5.5%, aluminium 2.0%, cerium 0.45%, tin 0.60%, and surplus is magnesium and impurity.Preparation method's method of high-strength rare earth wrought magnesium alloys, adopts following steps: a, is melted in iron ware by magnesium ingot, and melting process adopts SO2+SF6 gas shield; B, be warming up to 665 DEG C subsequently and add aluminium, zinc, tin successively, 740-760 DEG C adds cerium; C, magnesium alloy fused mass add refining agent blowing argon gas and stir refining 20 minutes 740 DEG C time, are cooled to 675 DEG C of standing 40min; D, magnesium alloy fused mass is warming up to 715 DEG C carries out semicontinuous casting rod, casting rod diameter of phi 136mm; E, be incubated at casting rod 330 DEG C after 12 hours Homogenization Treatments, dispute over trifles to diameter of phi 130mm, the ingot casting of disputing over trifles is squeezed into the bar that diameter is Φ 25mm at temperature 378 DEG C.F.420 DEG C solution treatment in * 2 hours, 180 DEG C of * 16 hours ageing treatment.After the timeliness of the bar obtained after adopting above-mentioned technique to extrude, the room temperature tensile properties of bar is: tensile strength is σ
b=322MPa, yield strength σ
0.2=248MPa, unit elongation is δ=15%.
Embodiment 5:
High-strength rare earth wrought magnesium alloys, is made up of the raw material of following mass percent: zinc 5.5%, aluminium 2.5%, cerium 0.50%, tin 0.50%, and surplus is magnesium and impurity.Preparation method's method of high-strength rare earth wrought magnesium alloys, adopts following steps: a, is melted in iron ware by magnesium ingot, and melting process adopts SO2+SF6 gas shield; B, be warming up to 665 DEG C subsequently and add aluminium, zinc, tin successively, 740-760 DEG C adds cerium; C, magnesium alloy fused mass add refining agent blowing argon gas and stir refining 20 minutes 732 DEG C time, are cooled to 685 DEG C of standing 40min; D, magnesium alloy fused mass is warming up to 718 DEG C carries out semicontinuous casting rod, casting rod diameter of phi 136mm; E, be incubated at casting rod 330 DEG C after 12 hours Homogenization Treatments, dispute over trifles to diameter of phi 130mm, the ingot casting of disputing over trifles is squeezed into the bar that diameter is Φ 25mm at temperature 378 DEG C.F.420 DEG C solution treatment in * 2 hours, 180 DEG C of * 16 hours ageing treatment.After the timeliness of the bar obtained after adopting above-mentioned technique to extrude, the room temperature tensile properties of bar is: tensile strength is σ
b=330MPa, yield strength σ
0.2=242MPa, unit elongation is δ=14%.
Claims (3)
1. a high-strength rare earth wrought magnesium alloys, is characterized in that: comprise magnesium, zinc, aluminium, cerium, tin, the mass percent of each component is: Zn:5 ~ 6%; Al:1 ~ 3%; Ce0.3 ~ 0.7%; Sn0.3 ~ 0.7%; Inevitable impurity≤0.15%; All the other are magnesium.
2. high-ductility rare earth wrought magnesium alloys according to claim 1, is characterized in that: the mass percent of zinc, aluminium, cerium, tin is: Zn:5.7%; Al:2.2%; Ce:0.60%; Sn:0.45%.
3. a preparation method for high-strength rare earth wrought magnesium alloys, is characterized in that comprising step:
(1) melt: be placed in iron ware by magnesium ingot and melt, melting process adopts SO
2+ SF
6gas shield;
(2) alloying: be warming up to 660-670 DEG C and add aluminium, zinc, tin, is warming up to 740-760 DEG C and adds cerium, and alloying process stirs alloy melt, to ensure being uniformly distributed of alloying element;
(3) refining: add refining agent when 720-750 DEG C, refining agent consumption accounts for the 1-2% of furnace charge total amount, refining time 15min;
(4) cooling is left standstill: after refining completes with at 660-690 DEG C, leave standstill 40min;
(5) semicontinuous casting rod: be warming up to 700-720 DEG C and carry out semicontinuous casting rod;
(6) extrusion processing: after casting rod is incubated 12 hours Homogenization Treatments at 330 DEG C, dispute over trifles, the ingot casting of disputing over trifles is carried out at temperature 370-380 DEG C deformation processing and become goods.
(7) fixation rates: 420 DEG C of solution treatment in * 2 hours, 180 DEG C of * 16 hours ageing treatment.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1789457A (en) * | 2004-12-17 | 2006-06-21 | 长沙市美克科技开发有限公司 | Thin-grain high-plasticity rare earth-containing wrought magnesium alloys |
| CN103695741A (en) * | 2013-12-16 | 2014-04-02 | 中国科学院金属研究所 | Mg-Zn-Al-Sn-Mn series magnesium alloy and preparation method thereof |
| CN104388786A (en) * | 2014-11-27 | 2015-03-04 | 重庆大学 | High-strength high-plasticity Mg-Zn-Al-Sn magnesium alloy |
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2015
- 2015-06-17 CN CN201510332723.6A patent/CN104862568A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1789457A (en) * | 2004-12-17 | 2006-06-21 | 长沙市美克科技开发有限公司 | Thin-grain high-plasticity rare earth-containing wrought magnesium alloys |
| CN103695741A (en) * | 2013-12-16 | 2014-04-02 | 中国科学院金属研究所 | Mg-Zn-Al-Sn-Mn series magnesium alloy and preparation method thereof |
| CN104388786A (en) * | 2014-11-27 | 2015-03-04 | 重庆大学 | High-strength high-plasticity Mg-Zn-Al-Sn magnesium alloy |
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Application publication date: 20150826 |