CN103334038B - A kind of alkaline earth magnesium alloy plate treatment process - Google Patents
A kind of alkaline earth magnesium alloy plate treatment process Download PDFInfo
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- CN103334038B CN103334038B CN201310171555.8A CN201310171555A CN103334038B CN 103334038 B CN103334038 B CN 103334038B CN 201310171555 A CN201310171555 A CN 201310171555A CN 103334038 B CN103334038 B CN 103334038B
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Abstract
The invention discloses a kind of alkaline earth magnesium alloy and sheet material founding treatment process thereof, comprise A1:7.5%-8.3%, Ca:1.0%-1.3%, Sr:0.2%-0.4%, Mn:0.2%-0.4%, surplus is Mg.Pure magnesium ingot and fine aluminium ingot is added, mixed gas protected with SF6 and CO2 under about 550 DEG C; Adopt the heat-up rate of 10 DEG C/min to be rapidly heated, after fusing, use molybdenum bar uniform stirring solution again; Be warming up to 720-750 DEG C, add Mg-Ca master alloy, Al-Sr master alloy, melts while stirring, completely latter static about 15 minutes of fusing, and temperature remains unchanged; Again static, about 20 minutes, cast between 690 DEG C-750 DEG C, casting mold was preheated to 200 DEG C.Present invention improves the form of second-phase in alkaline earth series heat resistance magnesium alloy, the comprehensive mechanical property of obtained alkaline earth magnesium alloy plate is more excellent.
Description
Technical field
The invention belongs to alloy material production field, particularly relate to a kind of alkaline earth magnesium alloy and sheet material founding treatment process thereof.
Background technology
Magnesium alloy has low density, high specific strength and specific rigidity, electric-conductivity heat-conductivity high, excellent damping characteristics and capability of electromagnetic shielding, good cast form performance and machinability, and be easy to recycle, thus have broad application prospects in fields such as aerospace, automobile making, household electrical appliances instrument, telecommunications, and become very important modern industry material.Mg-Al base alloy is owing to having good die casting, processing and mechanical property, and this alloy has that density is little, specific tenacity and specific rigidity advantages of higher, is current most widely used Magnesium Alloys.In recent years, the requirement of energy-conserving and environment-protective and automotive light weight technology has promoted magnesium alloy in the large-scale development of automotive field and application, most commercial magnesium alloy mainly Mg-Al system alloy, and the second-phase mainly eutectic β phase in Mg-Al system alloy, intensity and the toughness of its relative content, shape, distribution and size alloy all have a great impact.
Alloying improves one of the most frequently used and most effective means of magnesium alloy mechanical property.The alloying element added in Mg-Al system heat resistance magnesium alloy, is broadly divided into three classes: rare earth element, alkaline earth element and other alloying elements.Adopt rare earth element as alloy element important in magnesium alloy, there is crystal grain thinning, improve castability and improve the good characteristic such as room temperature and mechanical behavior under high temperature, but magnesium-rare earth cost is higher, limits its business-like application.Substitute the rare earth element in magnesium alloy with alkaline earth element Ca, not only can reduce costs, and can guaranteed performance.Therefore, add alkaline earth element Ca and carry out alloying, improve the comprehensive mechanical property of existing heat resistance magnesium alloy, and then exploitation is containing the heat resistance magnesium alloy of Ca, just become an important research direction, it not only can the microstructure of Refining Mg Alloy, improves the castability of magnesium alloy, can also improve magnesium alloy mechanical property.Current, attach great importance to the applied research of Ca in high-strength heat-resistant magnesium alloy, can start with from fire retardation, refined crystalline strengthening and dispersion-strengthened, carry heavy alloyed comprehensive mechanical property.
Magnesium-alloy material has direct casting and moulding machine-shaping, due to the large and poor mechanical property of the usual coarse grains of cast article, component segregation, its over-all properties advantage is difficult to bring into play, major part product such as important structured materials such as sheet material, tubing, section bar can only be produced with moulding moulding process, Here it is wrought magnesium alloys.Although the potentiality that magnesium alloy is widely used, the moulding difference of magnesium alloy, processing difficulties becomes the technical bottleneck of its large-scale production and application always, therefore improve wrought magnesium alloys moulding be its complete processing progress and quality product improve in the urgent need to.
Summary of the invention
The object of the invention is to the deficiency existed for prior art, there is provided a kind of have compared with high-ductility and intensity alkaline earth magnesium alloy materials and contribute to improving the casting method of this alkaline earth Magnesium Alloy form, with the treatment process of this alkaline earth magnesium alloy plate made.
For achieving the above object, technical scheme of the present invention is:
A kind of alkaline earth magnesium alloy, each composition comprised and weight percent thereof are: Al:7.5%-8.3%, Ca:1.0%-1.3%, Sr:0.2%-0.4%, Mn:0.2%-0.4%, and surplus is Mg.
A casting method for alkaline earth magnesium alloy, is preheated to garnet under about 550 DEG C, adds pure magnesium ingot and fine aluminium ingot by crucible, mixed gas protected with SF6 and CO2; Adopt the heat-up rate of 10 DEG C/min to be rapidly heated, after the alloy melting by the time added, use molybdenum bar uniform stirring solution again; Be warming up to 720-750 DEG C, add Mg-Ca master alloy, Al-Sr master alloy, melts while stirring, completely latter static about 15 minutes of fusing, and temperature remains unchanged; Again static, about 20 minutes, cast between 690 DEG C-750 DEG C, casting mold was preheated to 200 DEG C.
A kind of alkaline earth magnesium alloy plate treatment process, is characterized in that, first carry out solid solution treatment process: 400 DEG C of insulation 10h; Extrusion process: extrusion temperature 200 DEG C, extrusion ratio is 14: 1, extruding rate 2mm/min; Carry out aging treatment process again: 180 DEG C of insulation 42h.
In the present invention, raw material selection pure magnesium ingot, fine aluminium ingot, Mg-Ca master alloy, Al-Sr master alloy and MnCl2, prepare Mg-8Al-1.0Ca cast magnesium alloys, aluminum magnesium alloy is contained for higher, due to the uneven crystallization in process of setting, be easy to separate out the netted β phase of continuous print along grain boundaries, such tissue morphology is in the process used, especially during applied at elevated temperature, second-phase is easy to dissolve, thus low-alloyed mechanical property and work-ing life fall, after certain solution heat treatment, netted second-phase uniform dissolution is in matrix, like this after further timeliness, netted tissue disappears, tentatively improve the mechanical property of alloy.
Consider common magnesium alloy casting method, although the form of second-phase can be improved, eliminate netted β phase, the hardness of alloy and intensity comparatively as cast condition are improved to some extent, but owing to being attended by growing up of crystal grain in the process of solid solution, the average hardness value of alloy is compared with cast alloy, and increasing degree is not very high.The raising of intensity and plasticity is compared to the Mg-Al base alloy ratio of other series as AZ91, AZ31 etc., and its mechanical property is relatively low.For this reason, the present invention adopts best thermal treatment process scheme, for cast alloy after solid solution Homogenization Treatments, then carries out extrusion process with the extrusion ratio of 14: 1, extrusion temperature 200 DEG C.The aging technique in technology one is adopted to carry out ageing treatment more further.Due in the process of crimp, magnesium alloy is easy to occurrence dynamics recrystallize, significantly can reduce the size of crystal grain simultaneously, thus provide more forming core core for the precipitation of second-phase in ag(e)ing process, also for the precipitation of spherical second-phase stores a large amount of distortional strain energies and strain energy, the tissue morphology of tiny grain-size and spherical second-phase can possess higher plasticity and intensity simultaneously, thus produces a kind of cheap alkaline earth series wrought magnesium alloys with excellent comprehensive mechanical property.
Have employed technique scheme, beneficial effect of the present invention is: 1) aluminium is the main strengthening element in alloy, its solubleness in the magnesium alloy reaches as high as 12.7%, there is obvious thermal effectiveness, use the solution strengthening effect of Al in Mg and timeliness strengthening effect, thus improve the intensity of Mg-Al alloy.2) calcium is a kind of alkaline earth element of cheapness, can be solid-solution in β-Mg17Al12 mutually in, improve the form of β phase, improve the stability of second-phase simultaneously; Expensive rare earth element is replaced with calcium constituent, can be cost-saving, realize light-weighted object simultaneously.3) under Ca and crimp acting in conjunction, second-phase netted in alloy presents spherical particle Dispersed precipitate on matrix, such tissue morphology determines this alloy and has excellent intensity and plasticity, magnesium alloy plate of the present invention tensile strength at room temperature reaches as high as 320Mpa, and elongation can reach 20.3%.
Embodiment
Below in conjunction with embodiment, the present invention is further described.
Embodiment: selection raw material for standby by weight percentage: Al:7.5%-8.3%, Ca:1.0%-1.3%, Sr:0.2%-0.4%, Mn:0.2%-0.4%, surplus is Mg.Crucible is preheated to garnet under about 550 DEG C, adds pure magnesium ingot and fine aluminium ingot, mixed gas protected with SF6 and CO2; Adopt the heat-up rate of 10 DEG C/min to be rapidly heated, after the alloy melting by the time added, use molybdenum bar uniform stirring solution again; Be warming up to 720-750 DEG C, add Mg-Ca master alloy, Al-Sr master alloy, melts while stirring, completely latter static about 15 minutes of fusing, and temperature remains unchanged; Again static, about 20 minutes, cast between 690 DEG C-750 DEG C, casting mold was preheated to 200 DEG C.Gained alloy first carries out solid solution treatment process: 400 DEG C of insulation 10h; Extrusion process: extrusion temperature 200 DEG C, extrusion ratio is 14: 1, extruding rate 2mm/min; Carry out aging treatment process again: 180 DEG C of insulation 42h, obtain alkaline earth magnesium alloy plate.
As follows to the mechanics properties testing contrast of obtained magnesium alloy materials and the sheet alloy after solid solution extruding+ageing treatment:
Known, obtained alkaline earth magnesium alloy plate comprehensive mechanical property is more excellent.
The present invention is not limited to above-mentioned concrete embodiment, and those of ordinary skill in the art is from above-mentioned design, and without performing creative labour, done all conversion, all drop within protection scope of the present invention.
Claims (1)
1. an alkaline earth magnesium alloy plate treatment process, is characterized in that, described alkaline earth magnesium alloy comprises the composition of following mass percent: Al:7.5%-8.3%, Ca:1.0%-1.3%, Sr:0.2%-0.4%, Mn:0.2%-0.4%, and surplus is Mg; Described alkaline earth magnesium alloy plate is prepared by following steps successively:
1), by crucible be preheated to garnet at 550 DEG C, add pure magnesium ingot and fine aluminium ingot, use SF
6with CO
2mixed gas protected;
2), adopt the heat-up rate of 10 DEG C/min to be rapidly heated, after the alloy melting by the time added, use molybdenum bar uniform stirring liquation again;
3), be warming up to 720-750 DEG C, add Mg-Ca master alloy, Al-Sr master alloy, melts while stirring, and leave standstill 15 minutes after fusing completely, temperature remains unchanged;
4), again leave standstill 20 minutes, cast between 690 DEG C-750 DEG C, casting mold need be preheated to 200 DEG C;
5), gained alloy cast ingot is carried out solid solution treatment process: 400 DEG C of insulation 10h;
6), by the alloy cast ingot of solid solution treatment process carry out extrusion process: extrusion temperature 200 DEG C, extrusion ratio is 14: 1, extruding rate 2mm/min;
7), by the sheet material of extrusion process aging treatment process is carried out: 180 DEG C of insulation 42h, obtain alkaline earth magnesium alloy plate.
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| WO2019098269A1 (en) * | 2017-11-17 | 2019-05-23 | 住友電気工業株式会社 | Magnesium alloy and magnesium alloy member |
| CN109913720B (en) * | 2019-03-27 | 2020-11-24 | 东北大学 | High-calcium high-aluminum-content high-elasticity-modulus magnesium-based composite material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101476072A (en) * | 2009-01-19 | 2009-07-08 | 湖南大学 | Temperature distortion resistant magnesium alloy containing Ca and Sr |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101476072A (en) * | 2009-01-19 | 2009-07-08 | 湖南大学 | Temperature distortion resistant magnesium alloy containing Ca and Sr |
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