CN1614063A - Preparation of high-strength creep resistant deforming magnesium alloy - Google Patents
Preparation of high-strength creep resistant deforming magnesium alloy Download PDFInfo
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Abstract
The invention was involved in the preparation method of high intensity creep resistance magnesium alloy. The alloy consist of 3-9%Al, 0.1-0.5%Mn, 0.1-3%Ca, 0.05-1.0%Zn, 0.05-1.0%Si, lower than 0.02% impurity and the rest was Mg. Industrial pure magnesium was melted completely under the protection of agent of fusion, adding commercially pure aluminium, industrial pure zinc, industrial calcium, Al-Mn interalloy and Al-Si interalloy. After all the metals were melted, mix them equably and removed the surface scum and then cast them. The method was with low cost, simple technology and high efficiency. The strength of extension under room temperature/high temperature, yield strength, extensibility and creep resistance were improved obviously. The technology combined grain refining with shape change and the application range of Mg-Al magnesium alloy was increased.
Description
Technical field
That the present invention relates to is a kind of preparation technology of wrought magnesium alloys, specifically is a kind of preparation technology of high-strength creep resistant deforming magnesium alloy, is used for material processing field.
Background technology
Along with China's aerospace, car industry, magnesium alloy have high specific tenacity, specific rigidity, than elastic feel quantity, become the focus that material supplier author pays close attention to day by day.At present, the development scale of magnesium alloy aspect practical application has only 1/50 of Aluminum, and 1/160 of Iron And Steel Industry, its major cause are that 90% magnesium alloy component obtains from the die casting mode, has limited the kind and the type of product; Most of magnesium alloy structural parts are confined to the not high small volume part of requirement of strength.And magnesium alloy thermal distortion (as extruding, rolling etc.) back alloy organizing obtains refinement, and casting flaw is eliminated, and has higher intensity than cast magnesium alloys, ductility, more diversified mechanical property.Conventional Mg-Al base magnesium alloy such as AM50A, AZ31 and AZ91D etc. have good castability, cheap cost, but its room-temperature mechanical property is obviously not enough, serious system its further application.
According to famous Hall-Page (Hall-Petch) formula, grain refining can obviously improve the intensity of magnesium alloy.For Mg-Al base magnesium alloy, can add β (Mg thick in the alloying element refined cast structure
17Al
12) phase, obtain tinyly, the grain-boundary strengthening phase of disperse also can be by viscous deformation refined cast structure.For the raising of creep resistance, Si, Ca etc. are widely regarded as and improve magnesium alloy strength and stable on heating beneficial element.
Find by literature search, people such as Zhai Qiuya are at " Xi'an University of Technology's journal " (2002,18:254～257) in " crimp is to AZ31 magnesium alloy tissue and Effect on Performance " literary composition of delivering on, adopt AZ31 casting rod, utilizing extrusion ratio is 16～64 to push, experimental result is thought, crimp is the crystal grain of refinement magnesium alloy significantly, grain size is reduced to 35 μ m of extruding attitude by 400 μ m of as cast condition, tensile strength is brought up to 270～280MPa, and unit elongation is between 12%～16%.But because this extrusion process adopts an extrusion molding, squeeze is big, and unhomogeneity of deformation and stress distribution unevenness increase, and work hardening is serious, thereby has limited the range of application of this technology.
Summary of the invention
The objective of the invention is to overcome existing wrought magnesium alloys preparation technology's deficiency, propose a kind of preparation technology of high-strength creep resistant deforming magnesium alloy, make it, overcome merely with Mg by adding the compound enhancing magnesium alloy of Ca and Si
2Si phase or Al
2Ca strengthens the insufficient problem of magnesium alloy creep resistance, simultaneously by deformation technique, make alloy the crystal grain fragmentation, organize more refinement, composition is more even, inside is finer and close.This technology be refined crystalline strengthening and working hardening in the preparation method of the high-strength creep resistant magnesium alloy of one, enlarged Mg-Al base Application of Magnesium scope.
The present invention is achieved by the following technical solutions, each composition and the weight percent thereof of described high-strength creep resistant deforming magnesium alloy are: 3-9%Al, 0.1-3%Ca, 0.1-1%Mn, 0.05-1.0%Zn, 0.05-1.0%Si, impurity element Fe＜0.005%, Cu＜0.015%, Ni＜0.002%, all the other are Mg.Preparation technology is as follows: under gas or insulating covering agent protective condition; after pure magnesium melted fully, respectively with commercial-purity aluminium, technical pure calcium, industrial-purity zinc, Al-Mn master alloy, Al-Si master alloy form added alloy element Al; Ca; Mn, Zn, Si; after treating that alloying element all dissolves; stir with instrument it is mixed, cast after dragging for surface scum, then ingot casting is carried out viscous deformation (push or roll).
Below technology of the present invention is further specified, step is as follows:
(1) melting Mg: in smelting furnace, add the pure magnesium of oven dry, the heating melting;
(2) add Al, Mn and Zn: add commercial-purity aluminium, industrial-purity zinc and Al-Mn master alloy at 680 ℃～700 ℃;
(3) add Ca and Si: add technical pure calcium down at 720 ℃, the Al-Si master alloy is incubated and stirred 3～6 minutes after 20 minutes, so that Ca and Si fully melt;
(4) casting: continue insulation 15 minutes down at 720 ℃, after treating that alloying element all dissolves, stirring alloy liquid with instrument makes composition even, under 720 ℃～730 ℃ pouring temperature, left standstill 10 minutes, cast after dragging for surface scum then, castmethod can adopt die casting, low-pressure casting, permanent mold casting or sand casting;
(5) viscous deformation: ingot casting is handled 3～8h 380～420 ℃ of homogenizing, 410 ℃ of insulations 30～60 minutes, adopts extruding or binding technology to carry out plastic working then.
Described extrusion process, adopt in following two kinds any one:
1. as cast condition is directly pushed, and carries out the extruding first time when die temperature is 400 ℃, and extrusion ratio is 9～20; Then, extrusion 310 ℃ of insulations 30 minutes, is carried out the second time and pushes under 300 ℃ of the mould temperature, extrusion ratio is 9～20.
2. push after the solid solution, ingot casting carries out the extruding first time at 415 ℃ of solid solution 20h when die temperature is 400 ℃, and extrusion ratio is 9～20; Then, extrusion 310 ℃ of insulations 30 minutes, is carried out the second time and pushes under 300 ℃ of the mould temperature, extrusion ratio is 9～20.
Described binding technology, ingot casting is handled 3～8h 380～420 ℃ of homogenizing, 410 ℃ of insulations 30～60 minutes, rolling 9 passages that circulate then, the compression ratio of each passage is 15%, heating is 10 minutes before each passage is rolling.
Compared with prior art, the obvious refinement of the microstructure of wrought magnesium alloys of the present invention, Al
2The Ca pattern changes tiny particulate state into by thick Chinese character shape, becomes isolated disperse by continuous distribution and distributes.With the Mg-5Al-1Ca--1Si alloy is example, and it is 10 μ m (binding technology) that grain-size is fallen sharply by 40 μ m, and room temperature tensile strength, yield strength and unit elongation reach 302MPa, 146MPa, 16% respectively.High temperature 150 ℃ of tensile strength, yield strength and unit elongation are respectively 179MPa, 136MPa, 32%.Impelling strength improves more than 45%.Under the 200 ℃/50Mpa creep condition, the steady state creep speed of alloy is 2.6 * 10
-8%S
-1, and the steady state creep speed of AZ91 magnesium alloy is 7.7 * 10 under the same terms
-5%S
-1, promptly the high temperature creep-resisting performance of new alloy improves nearly 2 orders of magnitude than AZ91 magnesium alloy commonly used at present, surpasses the level of AE42 heat resistance magnesium alloy, and cost of alloy is then suitable with AZ91, and is more much lower than AE42 and ZE41.
Embodiment
Content in conjunction with technical solution of the present invention provides following examples:
Embodiment 1:
Alloying constituent (weight percent): 3.0%Al, 3.0%Ca, 0.05%Si, 0.1%Mn, 1%Zn, impurity element are less than 0.02%, and all the other are Mg.
Preparation technology's concrete steps of wrought magnesium alloys are: (1) adds pure magnesium according to mentioned component configuration alloy in electrical crucible, the heating melting is spread a small amount of insulating covering agent (JDF) simultaneously in crucible bottom; (2) treat that magnesium melts fully after, add commercial-purity aluminiums, industrial-purity zinc, Al-10Mn master alloy at 680 ℃; (3) add Al-20Si master alloy, technical pure calcium at 720 ℃, be incubated after 20 minutes and stirred 3 minutes, so that Ca and Si fully melt; (4) continue insulation 15 minutes down at 720 ℃, after treating that alloying element all dissolves, stir alloy liquid with instrument and make composition even, under 720 ℃ pouring temperature, left standstill 10 minutes, drag for then and in the low-pressure casting stove, adopt nitrogen to give behind the surface scum to compress into capable low-pressure casting; (5) ingot casting is handled 3h 420 ℃ of homogenizing, is incubated 30 minutes down at 410 ℃, adopts the direct extrusion process of as cast condition, carries out the extruding first time when die temperature is 400 ℃, and extrusion ratio is 20; Then, extrusion 310 ℃ of insulations 30 minutes, is carried out the second time and pushes under 300 ℃ of the mould temperature, extrusion ratio is 9.The grain size of the alloy of present embodiment is that 15 μ m, room temperature tensile strength, yield strength and unit elongation reach 290MPa, 135MPa, 11% respectively.High temperature 150 ℃ of tensile strength, yield strength and unit elongation are respectively 172MPa, 125MPa, 28%.
Embodiment 2:
Alloying constituent (weight percent): 9.0%Al, 0.1%Ca, 1%Si, 0.3%Mn, 0.1%Zn, impurity element are less than 0.02%, and all the other are Mg.
Preparation technology's concrete steps of wrought magnesium alloys are: (1) adds pure magnesium according to mentioned component configuration alloy in electrical crucible, adopt FS simultaneously
60.5%/CO
2Mixed gas protected; (2) treat that magnesium melts fully after, add commercial-purity aluminiums, industrial-purity zinc, Al-10Mn master alloy at 700 ℃; (3) add Al-20Si master alloy, technical pure calcium at 720 ℃, be incubated after 20 minutes and stirred 6 minutes, so that Ca and Si fully melt; (4) continue insulation 15 minutes down at 720 ℃, after treating that alloying element all dissolves, stir alloy liquid with instrument and make composition even, under 730 ℃ pouring temperature, left standstill 10 minutes, drag for then and in the low-pressure casting stove, adopt nitrogen to give behind the surface scum to compress into capable low-pressure casting.(5) ingot casting is handled 5h 380 ℃ of homogenizing, adopts extrusion process after the solid solution then, and ingot casting is at 415 ℃ of solid solution 20h, 410 ℃ of insulations 60 minutes down, carries out first time and push when die temperature is 400 ℃ then, and extrusion ratio is 9; Then, extrusion 310 ℃ of insulations 30 minutes, is carried out the second time and pushes under 300 ℃ of the mould temperature, extrusion ratio is 20.The grain size of the alloy of present embodiment is that 10 μ m, room temperature tensile strength, yield strength and unit elongation reach 300MPa, 145MPa, 15% respectively.High temperature 150 ℃ of tensile strength, yield strength and unit elongation are respectively 180MPa, 130MPa, 35%.
Embodiment 3:
Alloying constituent (weight percent): 4.0%Al, 2%Ca, 0.1%Si, 1%Mn, 0.05%Zn, impurity element are less than 0.02%, and all the other are Mg.
Preparation technology's concrete steps of wrought magnesium alloys are: (1) adds pure magnesium according to mentioned component configuration alloy in electrical crucible, the heating melting is spread a small amount of insulating covering agent (JDF) simultaneously in crucible bottom; (2) treat that magnesium melts fully after, add commercial-purity aluminiums, industrial-purity zinc, Al-10Mn master alloy at 690 ℃; (3) add Al-20Si master alloy, technical pure calcium at 720 ℃, be incubated after 20 minutes and stirred 4 minutes, so that Ca and Si fully melt; (4) continue insulation 15 minutes down at 720 ℃, after treating that alloying element all dissolves, stir alloy liquid with instrument and make composition even, under 730 ℃ pouring temperature, left standstill 10 minutes, drag for then and in the low-pressure casting stove, adopt nitrogen to give behind the surface scum to compress into capable low-pressure casting.(5) ingot casting is handled 8h 400 ℃ of homogenizing, is incubated 40 minutes down at 410 ℃, rolling 9 passages that circulate then, and the compression ratio of each passage is 15%, heating is 10 minutes before each passage is rolling.The grain size of the alloy of present embodiment is that 8 μ m, room temperature tensile strength, yield strength and unit elongation reach 292MPa, 147MPa, 14% respectively.High temperature 150 ℃ of tensile strength, yield strength and unit elongation are respectively 178MPa, 131MPa, 36%.
Embodiment 4:
Alloying constituent (weight percent): 5.0%Al, 1.0%Ca, 1%Si, 0.3%Mn, 0.1%Zn, impurity element are less than 0.02%, and all the other are Mg.
Preparation technology's concrete steps of wrought magnesium alloys are: (1) adds pure magnesium according to mentioned component configuration alloy in electrical crucible, FS is adopted in the heating melting simultaneously
60.5%/CO
2Mixed gas protected; (2) treat that magnesium melts fully after, add commercial-purity aluminiums, industrial-purity zinc, Al-10Mn master alloy at 700 ℃; (3) add Al-20Si master alloy, technical pure calcium at 720 ℃, be incubated after 20 minutes and stirred 6 minutes, so that Ca and Si fully melt; (4) continue insulation 15 minutes down at 720 ℃, after treating that alloying element all dissolves, stir alloy liquid with instrument and make composition even, under 730 ℃ pouring temperature, left standstill 10 minutes, drag for then and in the low-pressure casting stove, adopt nitrogen to give behind the surface scum to compress into capable low-pressure casting.(5) ingot casting is handled 3h 400 ℃ of homogenizing, is incubated 60 minutes down at 410 ℃, adopts the direct extrusion process of as cast condition, carries out the extruding first time when die temperature is 400 ℃, and extrusion ratio is 16; Then, extrusion 310 ℃ of insulations 30 minutes, is carried out the second time and pushes under 300 ℃ of the mould temperature, extrusion ratio is 13.The grain size of the alloy of present embodiment is that 10 μ m, room temperature tensile strength, yield strength and unit elongation reach 302MPa, 146MPa, 16% respectively.High temperature 150 ℃ of tensile strength, yield strength and unit elongation are respectively 179MPa, 136MPa, 32%.
Claims (5)
1; a kind of preparation technology of high-strength creep resistant deforming magnesium alloy; it is characterized in that; described magnesium alloy component and weight percent thereof are: 3-9%Al; 0.1-1%Mn, 0.1-3%Ca, 0.05-1.0%Zn; 0.05-1.0%Si; impurity element Fe＜0.005%, Cu＜0.015%, Ni＜0.002%; all the other are Mg; preparation technology is as follows: under gas or insulating covering agent protective condition, after pure magnesium melted fully, respectively with commercial-purity aluminium; technical pure calcium; industrial-purity zinc; Al-Mn master alloy and Al-Si master alloy form add alloy element Al; Ca; Mn, Zn, Si; after treating that alloying element all dissolves; stir with instrument it is mixed, cast after dragging for surface scum, then ingot casting is carried out viscous deformation.
2, the preparation technology of high-strength creep resistant deforming magnesium alloy according to claim 1 is characterized in that, below it is done further to limit, and step is as follows:
(1) melting Mg: in smelting furnace, add the pure magnesium of oven dry, the heating melting;
(2) add Al, Mn and Zn: add commercial-purity aluminium, industrial-purity zinc and Al-Mn master alloy at 680 ℃～700 ℃;
(3) add Ca and Si: add technical pure calcium down at 720 ℃, the Al-Si master alloy is incubated and stirred 3～6 minutes after 20 minutes, so that Ca and Si fully melt;
(4) casting: continue down insulation 15 minutes at 720 ℃, treat that alloying element all after the dissolving, stirs alloy liquid with instrument and makes composition even, under 720 ℃～730 ℃ pouring temperature, left standstill 10 minutes, cast after dragging for surface scum then;
(5) distortion: ingot casting is handled 3～8h 380～420 ℃ of homogenizing, 410 ℃ of insulations 30～60 minutes, adopts extrusion process or binding technology plastic working.
3, the preparation technology of high-strength creep resistant deforming magnesium alloy according to claim 2 is characterized in that, described extrusion process adopts in following two kinds any one:
1. as cast condition is directly pushed, and carries out first time extruding when die temperature is 400 ℃, and extrusion ratio is 9～20, then, extrusion 310 ℃ of insulations 30 minutes, is carried out the second time under 300 ℃ of the mould temperature and pushes, and extrusion ratio is 9～20;
2. push after the solid solution, ingot casting is at 415 ℃ of solid solution 20h, carries out the extruding first time when die temperature is 400 ℃, and extrusion ratio is 9～20, then, extrusion 310 ℃ of insulations 30 minutes, carried out the second time under 300 ℃ of the mould temperature and pushes, and extrusion ratio is 9～20.
4, the preparation technology of high-strength creep resistant deforming magnesium alloy according to claim 2 is characterized in that, described binding technology, and rolling 9 passages that circulate, the compression ratio of each passage is 15%, heating is 10 minutes before each passage is rolling.
5, the preparation technology of high-strength creep resistant deforming magnesium alloy according to claim 1 and 2 is characterized in that, castmethod adopts die casting, low-pressure casting, permanent mold casting or sand casting.
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| CN100545286C (en) * | 2006-09-29 | 2009-09-30 | 上海交通大学 | High-strength creep resistant magnesium alloy and preparation method thereof |
| CN102052190B (en) * | 2009-10-27 | 2013-05-08 | 株式会社日立制作所 | Cast heat-resistant rare earth magnesium alloy engine piston and preparation method thereof |
| CN103290289A (en) * | 2013-04-03 | 2013-09-11 | 常州华晨铸造有限公司 | Magnesium alloy and preparation method thereof |
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| CN104561709A (en) * | 2014-12-04 | 2015-04-29 | 沈阳工业大学 | High-creep-performance casting magnesium alloy and preparation method thereof |
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| CN108690942A (en) * | 2018-06-22 | 2018-10-23 | 中南大学 | A method of improving magnesium alloy high temperature creep-resistant property using Grain Boundaries |
| CN108950333A (en) * | 2018-07-16 | 2018-12-07 | 江苏理工学院 | A kind of high-performance Mg-Al-Zn-Mn-Ca magnesium alloy and preparation method thereof |
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| US4149882A (en) * | 1974-12-30 | 1979-04-17 | Magnesium Elektron Limited | Magnesium alloys |
| RU2157422C1 (en) * | 1999-08-04 | 2000-10-10 | Открытое акционерное общество "АВИСМА титано-магниевый комбинат" | Method of production of high-purity magnesium alloy |
| CN1109115C (en) * | 2000-03-29 | 2003-05-21 | 上海交通大学 | Heat-resistant flame-retarded compression casting magnesium alloy and smelting cast technology thereof |
| EP1339888B1 (en) * | 2000-09-26 | 2011-04-13 | Kwang Seon Shin | High strength magnesium alloy |
| CN1113971C (en) * | 2001-08-14 | 2003-07-09 | 上海交通大学 | Structure refinement founding process of magnesium alloy containing Mg2Si reinforcing phase |
| CN1515697A (en) * | 2003-01-07 | 2004-07-28 | 死海镁有限公司 | Creep eresistant magnesium alloy with improved casting property |
| CN1190511C (en) * | 2003-01-28 | 2005-02-23 | 东南大学 | Heat-resistant light metals magnesium alloy |
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| CN102052190B (en) * | 2009-10-27 | 2013-05-08 | 株式会社日立制作所 | Cast heat-resistant rare earth magnesium alloy engine piston and preparation method thereof |
| CN104302798A (en) * | 2012-06-26 | 2015-01-21 | 百多力股份公司 | Magnesium-zinc-calcium alloy, method for production thereof, and use thereof |
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| CN106191585A (en) * | 2015-05-27 | 2016-12-07 | 本田技研工业株式会社 | Heat-resistant magnesium alloy and manufacture method thereof |
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| CN108690942A (en) * | 2018-06-22 | 2018-10-23 | 中南大学 | A method of improving magnesium alloy high temperature creep-resistant property using Grain Boundaries |
| CN108690942B (en) * | 2018-06-22 | 2020-06-19 | 中南大学 | Method for improving high-temperature creep resistance of magnesium alloy by utilizing bent grain boundary |
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Granted publication date: 20070214 Termination date: 20200929 |
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