CN110295307A - A kind of ultralight LA141 magnesium lithium alloy deep cooling roll process of high-strength plasticity - Google Patents
A kind of ultralight LA141 magnesium lithium alloy deep cooling roll process of high-strength plasticity Download PDFInfo
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- CN110295307A CN110295307A CN201910589665.3A CN201910589665A CN110295307A CN 110295307 A CN110295307 A CN 110295307A CN 201910589665 A CN201910589665 A CN 201910589665A CN 110295307 A CN110295307 A CN 110295307A
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- lithium alloy
- magnesium lithium
- deep cooling
- ultralight
- rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
Abstract
The present invention relates to magnesium lithium alloy processing technique fields, more particularly to a kind of ultralight LA141 magnesium lithium alloy deep cooling roll process of high-strength plasticity, in order to provide a kind of ultralight LA141 magnesium lithium alloy deep cooling roll process of high-strength plasticity more more excellent than traditional rolling deformation technique.The technique includes the following steps: to obtain magnesium lithium alloy ingot casting and Homogenization Treatments, deep cooling rolling magnesium lithium alloy and detection and analysis according to alloying component and content configuration raw material, melting.Deep cooling rolling magnesium lithium alloy technology of the invention is suitable for processing large scale magnesium lithium alloy production piece due to preparation method simple process, reliable, high-efficient, has important practical value.The tensile strength and elongation percentage of LA141 sheet alloy prepared by the present invention all increase substantially, deep cooling roll after LA141 sample in there is nanoscale twin, nano-twin crystal structure can increase its plasticity while improving alloy strength, have stronger improvement ability to the mechanical performance of plate.
Description
Technical field
The present invention relates to magnesium lithium alloy processing technique fields, close more particularly to a kind of ultralight LA141 magnesium lithium of high-strength plasticity
Golden deep cooling roll process.
Background technique
In China, magnesium and lithium resource are relatively abundanter, and developing good magnesium lithium alloy has long-range strategic importance.Magnesium lithium closes
Gold is used as ultra-light alloy (ρ=1.45~1.65g/cm3), light specific gravity, specific strength is high and has excellent electromagnetic shielding performance, life
Object compatibility and recycling property, have broad application prospects in fields such as space flight, automobile, medical treatment, 3C and sports equipments.Although magnesium
Lithium alloy has many merits and is widely applied, but its lower intensity seriously limits the application of magnesium lithium alloy.Cause
This, the processing technology that exploitation can be effectively improved magnesium lithium alloy mechanical property is extremely important.
LA141 magnesium lithium alloy is a kind of very typical high lithium content magnesium lithium alloy, there is unique body-centered cubic lattic
Structure, there is excellent room temperature forming capacity compared with the magnesium alloy of close-packed hexagonal lattice structure, this characteristic makes to this
Alloy carries out cryogenic forming and is possibly realized.The present invention is based on this characteristics of LA141 magnesium lithium alloy, adopt to LA141 magnesium lithium alloy
It is plastically deformed with deep cooling roll process, it is intended to provide beneficial reference for the Plastic Forming industrial production of magnesium lithium alloy.
Summary of the invention
It is ultralight the purpose of the invention is to provide a kind of high-strength plasticity more more excellent than traditional rolling deformation technique
LA141 magnesium lithium alloy deep cooling roll process.
In order to achieve the object of the present invention, the technical solution adopted is that:
A kind of ultralight LA141 magnesium lithium alloy deep cooling roll process of high-strength plasticity, includes the following steps: according to alloying component and matter
Measure percentage composition and configure raw material: Li:14%, Al:1.0%, remaining is Mg；Raw material is put into the melting kettle of vacuum melting furnace
In, after the completion of charging, recirculated water is opened, covers tightly vacuum induction melting furnace bell, open pumped vacuum systems, makes in furnace pressure 1
× 10-2Pa makes pressure in furnace maintain 0.04-0.05MPa hereinafter, be then passed through argon gas into furnace；Open vaccum sensitive stove
Intermediate frequency induction heating device, smelting temperature are 700 DEG C ± 15 DEG C, and constant temperature is kept for 8-12 minutes, close intermediate frequency induction heating device,
Alloy melt is poured into mold by external rocker arm again, ingot casting is taken out after furnace cooling, and obtained magnesium lithium alloy is carried out
Homogenization Treatments；Deep cooling rolling magnesium lithium alloy is carried out again；Finally, being tested and analyzed.
The raw material Li, the purity of Al, Mg are 99.99%.
The temperature of the magnesium lithium alloy Homogenization Treatments is 200 DEG C, and soaking time is 8 hours.
The blocky sample that the sample of the magnesium lithium alloy deep cooling rolling is 20mm；The process of aluminium lithium alloy deep cooling rolling is will
Sample, which is placed in liquid nitrogen, impregnates 30min, and specimen temperature is made to reach -196 DEG C, and being then repeatedly rolling to final thickness is 2mm.
Mill speed is 10.5mm/s in the operation of rolling, and it is 20%-25% that alloy rolls pushing rate every time, every time
After rolling, sample will be impregnated 10 minutes in liquid nitrogen and be cooled to -196 DEG C.
Compared with prior art, the beneficial effects of the present invention are:
It is big to be suitable for processing due to preparation method simple process, reliable for deep cooling rolling magnesium lithium alloy technology of the invention
Scale magnesium lithium alloy production piece, it is high-efficient, it is easy to spread, it is highly suitable for the LA141 magnesium that preparation has very good mechanical properties
Lithium alloy plate has important practical value.
The tensile strength of LA141 sheet alloy prepared by the present invention can reach 223MPa, respectively than equal fiery state sample
It is higher by 71MPa and 15MPa with the tensile strength of room temperature rolling sample, and the elongation percentage of the plate also increases substantially, respectively
Elongation percentage than equal fiery state sample and room temperature rolling sample improves 4 times and 1.4 times.For body-centered cubic lattic structure
For LA141 magnesium lithium alloy, conventional machining process is difficult to generate twin, however by saturating in the LA141 sample after deep cooling rolls
Radio sem observation has arrived nanoscale twin, and nano-twin crystal structure is typical Plastic phase, can be while improving alloy strength
Increase its plasticity, has stronger improvement ability to the mechanical performance of plate.
Detailed description of the invention
Fig. 1 is the engineering stress strain curve under three kinds of status conditions；
Fig. 2 is the transmission electron microscope photo that deep cooling rolls rear alloy.
Specific embodiment
The invention will be described in further detail with reference to the accompanying drawing:
The present invention relates to magnesium lithium alloy processing technique fields, close more particularly to a kind of ultralight LA141 magnesium lithium of high-strength plasticity
Golden deep cooling roll process.It is super the purpose of the invention is to provide a kind of high-strength plasticity more more excellent than traditional rolling deformation technique
Light LA141 magnesium lithium alloy deep cooling roll process.
In order to achieve the object of the present invention, the technical solution adopted is that:
A kind of ultralight LA141 magnesium lithium alloy deep cooling roll process of high-strength plasticity, includes the following steps: according to alloying component and matter
Measure percentage composition and configure raw material: Li:14%, Al:1.0%, remaining is Mg；Raw material is put into the melting kettle of vacuum melting furnace
In, after the completion of charging, recirculated water is opened, covers tightly vacuum induction melting furnace bell, open pumped vacuum systems, makes in furnace pressure 1
× 10-2Pa makes pressure in furnace maintain 0.04-0.05MPa hereinafter, be then passed through argon gas into furnace；Open vaccum sensitive stove
Intermediate frequency induction heating device, smelting temperature are 700 DEG C ± 15 DEG C, and constant temperature is kept for 8-12 minutes, close intermediate frequency induction heating device,
Alloy melt is poured into mold by external rocker arm again, ingot casting is taken out after furnace cooling, and obtained magnesium lithium alloy is carried out
Homogenization Treatments；Deep cooling rolling magnesium lithium alloy is carried out again；Finally, being tested and analyzed.
The raw material Li, the purity of Al, Mg are 99.99%.
The temperature of the magnesium lithium alloy Homogenization Treatments is 200 DEG C, and soaking time is 8 hours.
The blocky sample that the sample of the magnesium lithium alloy deep cooling rolling is 20mm；The process of aluminium lithium alloy deep cooling rolling is will
Sample, which is placed in liquid nitrogen, impregnates 30min, and specimen temperature is made to reach -196 DEG C, and being then repeatedly rolling to final thickness is 2mm.
Mill speed is 10.5mm/s in the operation of rolling, and it is 20%-25% that alloy rolls pushing rate every time, every time
After rolling, sample will be impregnated 10 minutes in liquid nitrogen.
Compared with prior art, the beneficial effects of the present invention are:
It is big to be suitable for processing due to preparation method simple process, reliable for deep cooling rolling magnesium lithium alloy technology of the invention
Scale magnesium lithium alloy production piece, it is high-efficient, it is easy to spread, it is highly suitable for the LA141 magnesium that preparation has very good mechanical properties
Lithium alloy plate has important practical value；
The tensile strength of LA141 sheet alloy prepared by the present invention can reach 223MPa, respectively than equal fiery state sample
It is higher by 71MPa and 15MPa with the tensile strength of room temperature rolling sample, and the elongation percentage of the plate also increases substantially, respectively
Elongation percentage than equal fiery state sample and room temperature rolling sample improves 4 times and 1.4 times.For body-centered cubic lattic structure
For LA141 magnesium lithium alloy, conventional machining process is difficult to generate twin, however by saturating in the LA141 sample after deep cooling rolls
Radio sem observation has arrived nanoscale twin.Nano-twin crystal structure is typical Plastic phase, can be while improving alloy strength
Increase its plasticity, has stronger improvement ability to the mechanical performance of plate.
It is further described below:
A kind of technique that LA141 magnesium lithium alloy progress deep cooling ultralight for high-strength plasticity rolls:
1. configured raw material is put into the melting kettle of vacuum melting furnace, after the completion of charging, recirculated water is opened, is covered tightly
Vacuum induction melting furnace bell.Pumped vacuum systems is opened, makes in furnace pressure 1 × 10-2Pa or less.Then argon is passed through into furnace
Gas makes pressure in furnace maintain 0.04-0.05MPa.The intermediate frequency induction heating device of vaccum sensitive stove is opened, smelting temperature is about
700 DEG C ± 15 DEG C, constant temperature is kept for 8-12 minutes at this temperature, closes high-frequency induction heating apparatus.Then pass through external rocker arm
Alloy melt is poured into ready-made pre- cold mold, ingot casting is taken out after furnace cooling.
2. obtained magnesium lithium alloy ingot to be kept the temperature to 8 hours progress Homogenization Treatments in 200 DEG C of heat-treatment furnace.Magnesium lithium closes
The ingredient and mass percentage of the plate of gold are Li:13.9%, Al:1.1%, remaining is magnesium.Homogenizing annealing state LA141
The room-temperature mechanical property of magnesium lithium alloy are as follows: ultimate tensile strength 152MPa, elongation percentage 6.3%.
3. magnesium lithium alloy ingot is cut into the blocky sample that original depth is 20mm using wire cutting before rolling, then by sample
It is placed in liquid nitrogen and impregnates 30min, specimen temperature is made to reach -196 DEG C.Roller diameter is 200mm, and revolving speed is 700 revs/min, is closed
Golden draught per pass is 20%~25%, and finish to gauge is with a thickness of 2mm.In the entire operation of rolling, roll is not preheated, and is not also used
Any lubricant.And after rolling per pass, all sample is impregnated into 10min in liquid nitrogen, repeat multi-pass and roll
System is until final deformation amount.The ultimate tensile strength of the LA141 magnesium lithium alloy plate is 223MPa, elongation percentage 25.8%.
Compare a kind of case: pair rolling technique carried out at room temperature for ultralight LA141 magnesium lithium alloy
Sheet coupon is from sheet alloy in embodiment 1, and homogenizing annealing processing mode is the same as embodiment 1.It is utilized before rolling
Magnesium lithium alloy ingot is cut into the blocky sample that original depth is 20mm by wire cutting, and the operation of rolling carries out at room temperature, roller diameter
For 200mm, revolving speed is 700 revs/min, and alloy draught per pass is 20%~25%, and finish to gauge is with a thickness of 2mm.Entirely rolling
During system, roll is not preheated, and does not also use any lubricant.Multi- pass rolling is carried out until final deformation amount.The LA141 magnesium
The ultimate tensile strength of lithium alloy plate is 208MPa, elongation percentage 18.5%.The intensity of the comparative example magnesium lithium alloy material and
Plasticity is worse than embodiment 1, this explanation, which rolls rolling mill practice by using deep cooling, can effectively improve the strong of LA141 magnesium lithium alloy plate
Degree, plasticity.
In summary: the present invention relates to magnesium lithium alloy processing technique fields, ultralight more particularly to a kind of high-strength plasticity
LA141 magnesium lithium alloy deep cooling roll process, in order to which a kind of high-strength modeling more more excellent than traditional rolling deformation technique is provided
The ultralight LA141 magnesium lithium alloy deep cooling roll process of property.The technique include the following steps: according to alloying component and content configuration raw material,
Melting obtains magnesium lithium alloy ingot casting and Homogenization Treatments, deep cooling rolling magnesium lithium alloy and detection and analysis.Deep cooling rolling of the invention
Magnesium lithium alloy technology is suitable for processing large scale magnesium lithium alloy production piece, efficiency due to preparation method simple process, reliable
Height, it is easy to spread, there is important practical value.The tensile strength and elongation percentage of LA141 sheet alloy prepared by the present invention are all
Increase substantially, deep cooling roll after LA141 sample in there is nanoscale twin, nano-twin crystal structure can be to improve alloy strong
Increase its plasticity while spending, has stronger improvement ability to the mechanical performance of plate.
Claims (5)
1. a kind of ultralight LA141 magnesium lithium alloy deep cooling roll process of high-strength plasticity, which comprises the steps of:
(1) configure raw material according to alloying component and mass percentage: Li:14%, Al:1.0%, remaining is Mg；
(2) raw material is put into the melting kettle of vacuum melting furnace, after the completion of charging, opens recirculated water, it is molten covers tightly vacuum induction
Furnace bell opens pumped vacuum systems, makes in furnace pressure 1 × 10-2Pa makes furnace internal pressure hereinafter, be then passed through argon gas into furnace
0.04-0.05MPa is maintained by force；The intermediate frequency induction heating device for opening vaccum sensitive stove, makes temperature be heated to 700 DEG C ± 15
DEG C, constant temperature is kept for 8-12 minutes；Intermediate frequency induction heating device is closed, then is poured into alloy melt in mold by external rocker arm,
Ingot casting is taken out after furnace cooling, and obtained magnesium lithium alloy ingot casting is subjected to Homogenization Treatments；
(3) it carries out deep cooling and rolls magnesium lithium alloy；
(4) it is tested and analyzed.
2. the ultralight LA141 magnesium lithium alloy deep cooling roll process of a kind of high-strength plasticity according to claim 1, which is characterized in that
The raw material Li, the purity of Al, Mg are 99.99%.
3. the ultralight LA141 magnesium lithium alloy deep cooling roll process of a kind of high-strength plasticity according to claim 1, which is characterized in that
The temperature of the magnesium lithium alloy Homogenization Treatments is 200 DEG C, and soaking time is 8 hours.
4. the ultralight LA141 magnesium lithium alloy deep cooling roll process of a kind of high-strength plasticity according to claim 1, which is characterized in that
The sample of the magnesium lithium alloy deep cooling rolling is the blocky sample of 20mm thickness, and the process of aluminium lithium alloy deep cooling rolling is to put sample
30min is impregnated in liquid nitrogen, specimen temperature is made to reach -196 DEG C, and being then repeatedly rolling to final thickness is 2mm.
5. the ultralight LA141 magnesium lithium alloy deep cooling roll process of a kind of high-strength plasticity according to claim 4, which is characterized in that
Mill speed is 10.5mm/s in the operation of rolling, and it is 20%-25% that aluminium lithium alloy rolls pushing rate every time, and rolling every time
After, sample will be impregnated 10 minutes in liquid nitrogen and be cooled to -196 DEG C.
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Cited By (5)
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| CN111545585A (en) * | 2020-05-15 | 2020-08-18 | 南通南京大学材料工程技术研究院 | Preparation method of ultrahigh-strength pure aluminum |
| CN114000071A (en) * | 2021-10-29 | 2022-02-01 | 内蒙古科技大学 | Cryogenic rolling method of LZ91 magnesium-lithium alloy |
| CN114196859A (en) * | 2021-12-17 | 2022-03-18 | 哈尔滨工程大学 | Method for preparing nanocrystalline-containing high-lithium magnesium lithium alloy by rolling at room temperature |
| CN114231809A (en) * | 2021-12-08 | 2022-03-25 | 南京理工大学 | High-strength high-thermal-stability ultralight magnesium-lithium alloy and preparation method thereof |
| CN115747685A (en) * | 2022-11-18 | 2023-03-07 | 哈尔滨工程大学 | Low-density high-specific-strength beta-phase magnesium-lithium alloy prepared based on deep cooling polyhedral rolling and preparation method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111545585A (en) * | 2020-05-15 | 2020-08-18 | 南通南京大学材料工程技术研究院 | Preparation method of ultrahigh-strength pure aluminum |
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| CN114231809A (en) * | 2021-12-08 | 2022-03-25 | 南京理工大学 | High-strength high-thermal-stability ultralight magnesium-lithium alloy and preparation method thereof |
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| CN114196859A (en) * | 2021-12-17 | 2022-03-18 | 哈尔滨工程大学 | Method for preparing nanocrystalline-containing high-lithium magnesium lithium alloy by rolling at room temperature |
| CN115747685A (en) * | 2022-11-18 | 2023-03-07 | 哈尔滨工程大学 | Low-density high-specific-strength beta-phase magnesium-lithium alloy prepared based on deep cooling polyhedral rolling and preparation method |
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