CN102534329A - Preparation method for magnesium alloy with high strength and large plasticity - Google Patents
Preparation method for magnesium alloy with high strength and large plasticity Download PDFInfo
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- CN102534329A CN102534329A CN2012100862521A CN201210086252A CN102534329A CN 102534329 A CN102534329 A CN 102534329A CN 2012100862521 A CN2012100862521 A CN 2012100862521A CN 201210086252 A CN201210086252 A CN 201210086252A CN 102534329 A CN102534329 A CN 102534329A
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Abstract
The invention relates to a preparation method for magnesium alloy with high strength and large plasticity. The magnesium alloy comprises the following components (weight percentage): 3-6% of aluminum (Al), 1-3% of zinc (Zn), 1.0-2.0% of titanium (Ti), 0.35-0.8% of rhenium (RE) neodymium, yttrium, cerium and gadolinium (Nd, Y, Ce and Gd). The total amount of impurity elements including silicon, ferrum, copper and nickel (Si, Fe, Cu and Ni) is smaller than 0.02%, and the remain is magnesium (Mg). During smelting, pure magnesium, aluminum ingot and zinc ingot are melted in a smelting furnace, and the magnesium alloy is obtained by adding middle alloy in the smelting furnace, and solid solution strengthening treatment and aging treatment are performed on the magnesium alloy. The obtained magnesium alloy is characterized in that compared with AZ, ZK series magnesium alloy for commercial use, the magnesium alloy has the comprehensive performance of integrating high strength (>350MPa), high toughness (extension rate>20%), low density, good anti-flaming performance and the like.
Description
Technical field
The present invention relates to a kind of magnesiumalloy and preparation method thereof, be specifically related to a kind of HS of microalloying preparation, big plasticity magnesium alloy and preparation method thereof of utilizing.Belong to class of metal materials and field of metallurgy.
Background technology
Magnesiumalloy has a wide range of applications in aerospace, military project, electronics, machinery, automobile and other industry, mainly is characteristics such as density is low because it possesses, shock resistance, capability of electromagnetic shielding is good, the specific tenacity specific rigidity high, machinability is good.China develops the magnesiumalloy industry energetically, not only has powerful resources advantage, and great demand is also arranged.
Yet, material such as magnesiumalloy substitution of Al alloy in recent years, the application development in every profession and trade is slower, and major cause is that present magnesiumalloy also exists following significant technical disadvantages:
(1) tensile strength is low: present commercial magnesiumalloy tensile strength all＜280MPa, especially mechanical behavior under high temperature is relatively poor, when temperature raise, its intensity and creep-resistant property descended significantly, had limited its application in fields such as structure, load-bearing;
(2) poor toughness: present commercial magnesiumalloy unit elongation generally＜10% has limited its machine-shaping property.If will improve intensity, then unit elongation will descend greatly, the ZK61 magnesiumalloy the highest like intensity, though its intensity can reach 275-305MPa, its unit elongation is merely 4-7%;
(3) chemically reactive high, be easy to oxidizing fire: will burn at 350 ℃, be difficult to thermo forming;
(4) erosion resistance is poor: matrix is prone to oxidation in air: generally at 3-5 days matrix surfaces oxidation will take place and become ash to black.
Therefore, exploitation magnesiumalloy new preparation technology is developed the novel magnesium alloy with excellent comprehensive performance (lightweight, high-strength, high-ductility, heat-resisting, anti-corrosion), has very important construction value undoubtedly.
Summary of the invention
Deficiency to prior art; The present invention provides HS, high-toughness magnesium alloy of a kind of optimization and preparation method thereof; Through adding alloy element Al, Zn, Ti, RE (Nd, Y, Ce, Gd); Under suitable melting and thermal treatment process condition, improve strength of materials toughness through refined crystalline strengthening, improve the material heat resistance through dispersion-strengthened; Through the strengthening effect that displacement solid solution, gap solid solution improve the strength of materials, make this magnesiumalloy have the mechanical properties such as intensity, unit elongation and hardness more excellent than conventional commercial magnesiumalloy.
Technical scheme of the present invention is: with Mg, Al, Zn is main adding elements; Adopting Al is first component, because Al density is little, and heat-treatable strengthened; Limit solid solubility in Mg sosoloid is 12.7wt %; Solid solubility when room temperature is 2wt%, obtains good timeliness precipitation strength and solid solution strengthening effect for guaranteeing alloy, and the add-on of Al is chosen to be 3-6wt %; Adopting Zn is second component; Zn maximum solid solution degree in Mg is 6.2wt%; But Zn content surpasses at 2.5% o'clock antiseptic property is had negative impact, too many for avoiding alloy density to increase simultaneously, Zn content generally is controlled at below the 2wt%; Zn can improve the susceptibility of stress corrosion, improves the safe range of stress of magnesiumalloy significantly.Adopt RE, Ti as the microalloying element, through the toughness and the use characteristics of improving alloy of dispersion-strengthened with the raising alloy.
A kind of HS provided by the present invention, big plasticity magnesium alloy; Its component (wt%) is: 3-6% Al, 1-3% Zn, 1.0-2.0%Ti, 0.35-0.8% RE (Nd, Y, Ce, Gd); The total amount of impurity element: Si, Fe, Cu and Ni is less than 0.02 %, and surplus is Mg.
HS provided by the invention, big plasticity magnesium alloy preparation method comprise melting technology and thermal treatment process.
The melting technology of Mg-Al-Zn-Ti-RE alloy is: pure magnesium, aluminium, zinc, master alloy Mg-RE and Al-Ti are preheated to 100-180 ℃ earlier, then pure magnesium, aluminium ingot, zinc ingot metal are placed CO
2The melt in furnace mixed gas protected with Ar; The fusing back is warming up to 760-840 ℃ again and adds Mg-RE, Al-Ti master alloy 650-760 ℃ of insulation 25-45 minute, treats after Mg-RE, the fusing of Al-Ti master alloy magnesium liquid to be warming up to 770-860 ℃ of insulation 30-50 minute; Be cooled to 650-800 ℃ again, leave standstill after 10-20 minute and cast, casting is heated to 150-300 ℃ in advance with steel die, makes Mg-Al-Zn-Ti-RE HS of the present invention, big plasticity magnesium alloy.
Thermal treatment process is: the Mg-A-Zn-Ti-RE HS that makes, big plasticity magnesium alloy are carried out solution strengthening handle, temperature is 410-440 ℃, and the time is 4-10 hour, hardening; Magnesiumalloy after solution strengthening is handled is carried out ageing treatment, and temperature is 170-190 ℃, and the time is 20-40 hour.
The substantive distinguishing features that the present invention had is:
(1) utilizes microalloying, form small and dispersed, equally distributed second phase of stablizing, effectively improved the room temperature tensile intensity and the unit elongation of magnesiumalloy.With Mg-3Al-2Zn-2Ti-0.6RE (30%Nd, 60%Y, 10%Ce) is example, and room temperature tensile strength is 295MPa after bakingout process, and unit elongation is 23.5 %; With Mg-6Al-2Zn-2Ti-0.8RE (30%Nd, 50%Y, 20%Gd) is example, and room temperature tensile strength is 360MPa after bakingout process, and unit elongation is 19%; And the room temperature tensile strength of the commercial deformed magnesium alloy of AZ series is up to 305MPa, and unit elongation is 11 %.The mechanical property of Mg-Al-Zn-Ti-RE alloy is apparently higher than the commercial deformed magnesium alloy of AZ series.
(2) adopt Mg-RE, Al-Ti master alloy to come to add indirectly RE, Ti element, can significantly reduce the smelting temperature of alloy and reduce the residence time of alloy under comparatively high temps, reduce volatilization; Equally distributed second phase of stablizing of disperse that microalloying forms also can be used as the grain growth of core thinning microstructure when effectively hindering the magnesiumalloy heat, improves its high-temperature stability greatly.
(3) adopt CO
2Carry out gas melting protection with 1: 20 ratio of Ar mixed gas; Adopt the interim type of heating of temperature according to liquid fused different steps; Form basic, normal, high temperature chemical conversion film resist technology, reduced the volatilization and the slag inclusion of melt liquid, ensured the pure and quality of ingot casting.
(4) solid solution and the ag(e)ing behavio(u)r of alloy under differing temps carried out comprehensive research, obtained solution treatment and the aging treatment process optimized; Alloy can be given full play to its solution strengthening and ageing strengthening effect under this treatment process.
EmbodimentBelow technical scheme of the present invention is described in detail through concrete embodiment.
Embodiment 1
Melting 1kg magnesiumalloy is taken pure magnesium ingot (purity 99.95%) 960g, zinc ingot metal (purity 99.99%) 18g, master alloy (Al-20Ti) 10g, (Mg-50Nd) 3.6g, (Mg-50Y) 7.2g, (Mg-50Ce) 1.2g.
Press the mentioned component alloyage, its founding is: pure magnesium ingot, zinc ingot metal, master alloy Mg-RE and Al-Ti are preheated to 120-140 ℃ earlier, then pure magnesium, zinc ingot metal are placed CO
2The melt in furnace mixed gas protected with Ar; The fusing back was 720-760 ℃ of insulation 25-35 minute; Be warming up to 760-800 ℃ and add Mg-RE, Al-Ti master alloy; Treat that after Mg-RE, Al-Ti master alloy melt magnesium liquid being warming up to 770-785 ℃ of insulation was cooled to 750-770 ℃ after 30 minutes; Leave standstill after 10-20 minute and cast, casting is heated to 150-200 ℃ in advance with steel die, obtains Mg-Al-Zn-Ti-RE HS of the present invention, big plasticity magnesium alloy.
Heat treatment of alloy technology is: 415 ℃ of solution treatment 6 hours, 175 ℃ of isothermal agings 24 hours.
Present embodiment gained alloy, room temperature tensile strength is 295MPa after bakingout process, unit elongation is 23.5 %.
Embodiment 2
Melting 1kg magnesiumalloy is taken pure magnesium ingot (purity 99.99%) 884g, aluminium ingot (purity 99.7%) 5g, zinc ingot metal (purity 99.99%) 20g, master alloy (Al-20Ti) 75g, (Mg-50Nd) 6.4g, (Mg-50Y) 6.4g, (Mg-50Ce) 3.2g.
Press the mentioned component alloyage, its founding is: pure magnesium ingot, zinc ingot metal, master alloy Mg-RE and Al-Ti are preheated to 120-140 ℃ earlier, then pure magnesium ingot, aluminium ingot, zinc ingot metal are placed CO
2The melt in furnace mixed gas protected with Ar; The fusing back was 740-760 ℃ of insulation 25-35 minute; Be warming up to 780-800 ℃ and add Mg-RE, Al-Ti master alloy; Treat that after Mg-RE, Al-Ti master alloy melt magnesium liquid being warming up to 770-785 ℃ of insulation was cooled to 720-750 ℃ after 30 minutes; Leave standstill after 10-20 minute and cast, casting is heated to 200-300 ℃ in advance with steel die, obtains Mg-Al-Zn-Ti-RE HS of the present invention, big plasticity magnesium alloy.
Heat treatment of alloy technology is: 435 ℃ of solution treatment 6 hours, 185 ℃ of isothermal agings 24 hours.
Present embodiment gained alloy, room temperature tensile strength is 360MPa after bakingout process, unit elongation is 19%.
Claims (7)
1. the preparation method of a HS, big plasticity magnesium alloy is characterized in that this magnesiumalloy has following component (wt%):
3-6% Al, 1-3% Zn, 1.0-2.0%Ti, 0.35-0.8% RE, the total amount of impurity element: Si, Fe, Cu and Ni is less than 0. 02 %, and surplus is Mg; Wherein, Ti and RE add with the master alloy form.
2. HS according to claim 1, big plasticity magnesium alloy; It is characterized in that: its contained component RE is a total amount of rare earth; Be the combination of one or both or three kinds among Nd, Y, Ce, the Gd, when being two kinds, its ratio is 1～1.5 ︰ 1.5 (mass ratio); When being three kinds, its ratio is 3～4 ︰, 4～6 ︰ 1～2 (mass ratio).
3. the preparation method of HS according to claim 1, big plasticity magnesium alloy, it is characterized in that: (1) is preheated to 100-180 ℃ earlier with pure magnesium, aluminium, zinc, master alloy Mg-RE and Al-Ti, then pure magnesium, aluminium ingot, zinc ingot metal is placed CO
2The melt in furnace mixed gas protected with Ar; (2) the fusing back is warming up to 760-840 ℃ again and adds Mg-RE, Al-Ti master alloy 650-760 ℃ of insulation 25-45 minute, treats after Mg-RE, the fusing of Al-Ti master alloy magnesium liquid to be warming up to 770-860 ℃ of insulation 30-50 minute; (3) be cooled to 650-800 ℃ again, leave standstill after 10-20 minute and cast, casting is heated to 150-300 ℃ in advance with steel die, makes Mg-Al-Zn-Ti-RE HS of the present invention, big plasticity magnesium alloy.
4. the preparation method of HS according to claim 3, big plasticity magnesium alloy, it is characterized in that: the composition of this master alloy is following: Al-20Ti, Mg-50Nd, Mg-50Ce, Mg-50Y, Mg-50Gd (wt%).
5. the preparation method of HS according to claim 3, big plasticity magnesium alloy, it is characterized in that: the gas shield classification of employing is: CO
2With Ar blended gas, consist of CO
2︰ Ar=1: 20 (volume ratios).
6. the preparation method of HS according to claim 3, big plasticity magnesium alloy is characterized in that: the Mg-Al-Zn-Ti-RE magnesiumalloy that makes is carried out solution strengthening handle, temperature is 410-440 ℃, and the time is 4-10 hour, hardening.
7. the preparation method of HS according to claim 6, big plasticity magnesium alloy, it is characterized in that: the Mg-Al-Zn-Ti-RE magnesiumalloy after solution strengthening is handled is carried out ageing treatment, and temperature is 170-190 ℃, and the time is 20-40 hour.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103540778A (en) * | 2013-10-25 | 2014-01-29 | 青海柴达木青元泛镁科技有限公司 | Forming method of chemical conversion film of Mg alloy melt |
| CN103774070A (en) * | 2014-01-22 | 2014-05-07 | 赣南师范学院 | Method for preparing Mg-Zn-Al-Cu super-high strength magnesium alloy sheet |
| CN104233029A (en) * | 2014-09-24 | 2014-12-24 | 中南大学 | High-strength degradable magnesium alloy and preparation method thereof |
| CN104498794A (en) * | 2014-12-15 | 2015-04-08 | 镁联科技（芜湖）有限公司 | High-temperature-resistant magnesium alloy, and preparation method and application thereof |
| CN105499921A (en) * | 2015-12-15 | 2016-04-20 | 青海柴达木青元泛镁科技有限公司 | Preparation method of high-strength and high-instant-solubility light fracture ball |
| CN105543744A (en) * | 2015-12-15 | 2016-05-04 | 青海柴达木青元泛镁科技有限公司 | Preparation method of light unmanned plane wing with high strength and low density |
| CN105537865A (en) * | 2015-12-15 | 2016-05-04 | 青海柴达木青元泛镁科技有限公司 | Preparation method of light bicycle frame with high strength and low density |
| CN105951013A (en) * | 2016-06-27 | 2016-09-21 | 湖南航天新材料技术研究院有限公司 | Multi-stage heat treatment strengthening technology of low-alloying magnesium alloy |
| CN106244877A (en) * | 2016-06-08 | 2016-12-21 | 南阳师范学院 | A kind of handset shell magnesium alloy materials and preparation method thereof |
| CN109022979A (en) * | 2018-09-10 | 2018-12-18 | 江苏理工学院 | A kind of high-strength temperature-resistant Mg-Zn-Al-Y-Sb magnesium alloy and preparation method thereof |
| CN109055791A (en) * | 2018-08-23 | 2018-12-21 | 中北大学 | A kind of preparation method of the high-strength magnesium alloy thin plate containing aluminium and titanium |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103540778A (en) * | 2013-10-25 | 2014-01-29 | 青海柴达木青元泛镁科技有限公司 | Forming method of chemical conversion film of Mg alloy melt |
| CN103540778B (en) * | 2013-10-25 | 2016-06-08 | 青海柴达木青元泛镁科技有限公司 | The chemical conversion film forming method of a kind of magnesium alloy fused mass |
| CN103774070A (en) * | 2014-01-22 | 2014-05-07 | 赣南师范学院 | Method for preparing Mg-Zn-Al-Cu super-high strength magnesium alloy sheet |
| CN103774070B (en) * | 2014-01-22 | 2015-11-11 | 赣南师范学院 | The strong magnesium alloy plate material, preparation method of a kind of Mg-Zn-Al-Cu system superelevation |
| CN104233029A (en) * | 2014-09-24 | 2014-12-24 | 中南大学 | High-strength degradable magnesium alloy and preparation method thereof |
| CN104498794A (en) * | 2014-12-15 | 2015-04-08 | 镁联科技（芜湖）有限公司 | High-temperature-resistant magnesium alloy, and preparation method and application thereof |
| CN105543744A (en) * | 2015-12-15 | 2016-05-04 | 青海柴达木青元泛镁科技有限公司 | Preparation method of light unmanned plane wing with high strength and low density |
| CN105537865A (en) * | 2015-12-15 | 2016-05-04 | 青海柴达木青元泛镁科技有限公司 | Preparation method of light bicycle frame with high strength and low density |
| CN105499921A (en) * | 2015-12-15 | 2016-04-20 | 青海柴达木青元泛镁科技有限公司 | Preparation method of high-strength and high-instant-solubility light fracture ball |
| CN105537865B (en) * | 2015-12-15 | 2019-03-26 | 青海柴达木青元泛镁科技有限公司 | A kind of preparation method of high-intensitive, low-density lightweight cycle frame |
| CN106244877A (en) * | 2016-06-08 | 2016-12-21 | 南阳师范学院 | A kind of handset shell magnesium alloy materials and preparation method thereof |
| CN105951013A (en) * | 2016-06-27 | 2016-09-21 | 湖南航天新材料技术研究院有限公司 | Multi-stage heat treatment strengthening technology of low-alloying magnesium alloy |
| CN105951013B (en) * | 2016-06-27 | 2017-12-26 | 长沙新材料产业研究院有限公司 | A kind of low alloying magnesium alloy multistage heat treatment-strengthening process |
| CN109055791A (en) * | 2018-08-23 | 2018-12-21 | 中北大学 | A kind of preparation method of the high-strength magnesium alloy thin plate containing aluminium and titanium |
| CN109022979A (en) * | 2018-09-10 | 2018-12-18 | 江苏理工学院 | A kind of high-strength temperature-resistant Mg-Zn-Al-Y-Sb magnesium alloy and preparation method thereof |
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Application publication date: 20120704 |