CN108330422A - A kind of cryogenic treatment process improving magnesium alloy toughness - Google Patents
A kind of cryogenic treatment process improving magnesium alloy toughness Download PDFInfo
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- CN108330422A CN108330422A CN201710034701.0A CN201710034701A CN108330422A CN 108330422 A CN108330422 A CN 108330422A CN 201710034701 A CN201710034701 A CN 201710034701A CN 108330422 A CN108330422 A CN 108330422A
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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
- C22F3/00—Changing the physical structure of non-ferrous metals or alloys by special physical methods, e.g. treatment with neutrons
- C22F3/02—Changing the physical structure of non-ferrous metals or alloys by special physical methods, e.g. treatment with neutrons by solidifying a melt controlled by supersonic waves or electric or magnetic fields
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/02—Use of electric or magnetic effects
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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
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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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
A kind of cryogenic treatment process improving magnesium alloy toughness, belongs to technical field of metal material.The technique includes that step is：(1) mold is preheated to 100 400 DEG C；(2) magnesium alloy fused mass, alloy graining are poured into a mould into the mold of preheating；The rotating excitation field that magnetic field intensity is 0.5 5T can be applied simultaneously in the whole process, mode is：It can not apply or apply magnetic field in casting process, apply magnetic field in process of setting；(3) magnesium alloy after solidification is kept the temperature to 6 48h solution treatment at 390 420 DEG C；(4) magnesium alloy after solution treatment is subjected to quenching treatment；(5) magnesium alloy after quenching treatment is placed in liquid nitrogen 24 48h of processing at 196-209 DEG C, obtains magnesium alloy.By being poured into a mould magnesium alloy under the conditions of rotating excitation field, alloy mechanical property is made to increased；After solid solution and subzero treatment, the toughness of magnesium alloy is greatly improved.The process technological process is simple, is conducive to actual application.
Description
Technical field
The invention belongs to technical field of metal material, and in particular to a kind of cryogenic treatment process improving magnesium alloy toughness.
Background technology
Magnesium alloy since itself has higher specific strength and specific stiffness and good thermal conductivity and dimensional stability,
By it has been recognized that being with development prospect " green material ".In recent years, magnesium alloy in terms of high ferro, automobile making,
It is used widely in terms of telecommunications and in terms of aerospace.But magnesium alloy improves magnesium alloy since its plasticity is poor
Toughness seem and be even more important.
Patent [CN201110041708.8] discloses a kind of preparation method of high-strength high-toughness magnesium alloy Strip,
Method is that the solid solution state magnesium alloy of water quenching cooling is placed in liquid by heat-altered morphology magnesium alloy or after 400-540 DEG C of heat preservation 1-15 hours
Cold deformation is carried out in nitrogen after subzero treatment, also can directly carry out cold deformation to original heat-altered morphology or solid solution state magnesium alloy, finally
5-100 hours are kept the temperature at 100-250 DEG C carries out artificial aging processing.Wherein heat-altered morphology AZ91 magnesium alloys are handled
Afterwards, the compression strength and maximum compression rate of magnesium alloy test specimen are respectively 488MPa and 15.4%.It invents mainly cold using liquid nitrogen
But the extremely low warm deformation under generates a large amount of dislocations, twin etc. and promotes precipitated phase forming core, and the twin generated can also change crystalline substance
Grain, which is orientated, weakens original texture, improves alloy ductility.It is playing the role of similar, but its depth with the present invention in subzero treatment
Cool time is excessively short, only 5-20min.
Patent [CN201310453776.4] discloses a kind of processing method improving magnesium alloy materials intensity and toughness,
Method is the solution treatment carried out successively to magnesium alloy materials and ageing treatment, at the same after ageing treatment to magnesium alloy materials with
Cooling velocity be 1-10 DEG C/min from room temperature be cooled to -196 DEG C progress 12-30h subzero treatment and during subzero treatment
To the ultrasonic field shock treatment that magnesium alloy materials carry out, finally made annealing treatment.After wherein handling AZ61 bars,
Tensile strength reaches 298MPa, elongation 20.5%.The invention is mainly by subzero treatment and during subzero treatment
Ultrasonic field shock treatment after, further played dislocation strengthening, nano twin crystal strengthen effect, to improve the magnesium alloy
The obdurability of material, but the cooling velocity experiment condition of the invention is difficult to control, and the process is more complicated.
Patent [CN201510861466.5] discloses a kind of deep cooling magnetic field processing improving magnesium alloy plastic deformation ability
Method, method are to be reduced to magnesium alloy sample after ultralow temperature according to certain cooling rate with liquid nitrogen to carry out magnetic field under permanent low temperature
It handles, reheating is warming up to temperature after being returned to room temperature after held for some time with certain heating rate, keeps the temperature one section
Furnace cooling after time.After wherein handling AZ31 magnesium alloys, elongation percentage 11.1%, tensile strength 260MPa.Its
Reduction magnesium alloy basal plane texture improves magnesium alloy temperature-room type plasticity processability to realize when mainly being acted on using deep cooling and magnetic coupling
Can, but the invention technique process is various, experimental temperature condition is not easy to control, and production efficiency is relatively low, and the plasticity of alloy is promoted
It is not too apparent.
Therefore, seek one kind and greatly improving magnesium alloy toughness and simple for process, to meet growing technique needs, show
It obtains particularly important.
Invention content
It is an object of the invention to improve the toughness of magnesium alloy, a kind of subzero treatment work improving magnesium alloy toughness is provided
Skill.By being poured into a mould magnesium alloy under the conditions of rotating excitation field, reduces the presence of the Dendritic TiC in process of setting tissue, increase
Probability existing for equiax crystal is added, alloy mechanical property is made to increased；Using solid solution and subzero treatment after, magnesium alloy it is tough
Property is greatly improved.The process technological process is simple, is conducive to actual application.
A kind of cryogenic treatment process of raising magnesium alloy toughness of the present invention, is achieved through the following technical solutions, specific to walk
It is rapid as follows：
(1) mold preheats
Mold is preheated, the mold after being preheated, wherein preheating temperature is 100-400 DEG C；
(2) it pours into a mould and solidifies
Pour into a mould magnesium alloy fused mass into the mold of preheating, after alloy graining, the magnesium alloy after being solidified；Wherein, whole
Rotating excitation field, magnetic field intensity 0.5-5T can be applied during a simultaneously, the mode for applying rotating excitation field is following two sides
One kind in method：
The first：Apply rotating excitation field in cast and process of setting, rotating excitation field is closed after alloy graining；
Second：Do not apply rotating excitation field in casting process, applies rotating excitation field in process of setting, closed after alloy graining
Close rotating excitation field；
(3) solution treatment
Magnesium alloy after solidification is subjected to solution treatment, obtains the magnesium alloy after solution treatment；Wherein, the temperature of solution treatment
Degree is 390-420 DEG C, and the soaking time of solution treatment is 6-48h；
(4) quenching treatment
Magnesium alloy after solution treatment is subjected to quenching treatment, is then cooled to room temperature, the conjunction of the magnesium after quenching treatment is obtained
Gold；Wherein, the mode of quenching treatment is to be put into 75-85 DEG C of water；
(5) subzero treatment
Magnesium alloy after quenching treatment is placed in liquid nitrogen and carries out subzero treatment, obtains magnesium alloy；Wherein, subzero treatment
Temperature is -196--209 DEG C, and the time of subzero treatment is 24-48h.
The magnesium alloy is that the alloy that other elements form is added for basic element with magnesium；The other elements are
One or more of Al, Mn, Zn, Zr, RE, Fe, Co, Mo, Ni or Cu are mixed, and when for several mixing, mixed proportion is to appoint
Meaning ratio.
The magnesium alloy is complex magnesium alloy, preferably Mg-Al systems, Mg-Mn systems, Mg-Zn systems, Mg-RE systems, Mg-Al-
Zn systems, Mg-Al-Mn systems, Mg-Zn-Zr systems, Mg-RE-Zn systems, Mg-RE-Cu systems, Mg-RE-Ni systems, Mg-Al-Mn-Zn systems, Mg-
One kind in Gd-Zn-Zr systems or Mg-Gd-Y-Zr systems.
In the step (1), the preheating, preheating time 1-2h.
In the step (2), the magnesium alloy fused mass be according to group of magnesium alloys distribution ratio weigh raw material, by raw material into
It is obtained after row melting.
A kind of cryogenic treatment process of raising magnesium alloy toughness of the present invention, compared with the prior art, advantage is：
1. the cryogenic treatment process provided by the invention for improving magnesium alloy toughness, process is simple, of low cost, peace
Quan Xinggao is suitable for large-scale promotion application.
2. being poured into a mould magnesium alloy under the conditions of rotating excitation field, equiaxial crystal ratio is increased, improves alloy property, then into
After the solid solution and subzero treatment of one step, the second coarse phase refines in alloy, and is evenly distributed on grain boundaries, and alloy resists
Tensile strength and elongation are significantly improved.Wherein, it is about 10- that crystallite dimension reduces than the alloy under natural coagulation
50%, elongation promotes 100-200% than the alloy of natural coagulation, than being solidified under rotating excitation field at non-solution treatment and non-deep cooling
The alloy of reason promotes about 50-130%.
Description of the drawings
Fig. 1 is the as-cast structure figure of the AZ31 magnesium alloys of natural coagulation；
Fig. 2 is the as-cast structure figure for the AZ31 magnesium alloys that non-solution treatment and non-subzero treatment are solidified under rotating excitation field；
Fig. 3 is the as-cast structure figure of the AZ91 magnesium alloys of natural coagulation；
Fig. 4 is the as-cast structure figure for the AZ91 magnesium alloys that non-solution treatment and non-subzero treatment are solidified under rotating excitation field；
Fig. 5 is the alloy microscopic structure figure of AZ31 magnesium alloys prepared by embodiment 1；
Fig. 6 is the alloy microscopic structure figure of AZ91 magnesium alloys prepared by embodiment 2；
Fig. 7 is the alloy microscopic structure figure of AZ31 magnesium alloys prepared by embodiment 3；
Wherein, the chemical composition and its mass percent that AZ31 magnesium alloys contain be：Al：2.5-3.0%, Zn：0.7-
1.3%, Mn：0.17-0.2%, surplus Mg；
The chemical composition and its mass percent that AZ91 magnesium alloys contain be：Al：8.5-9.5%, Zn：0.45-0.91%,
Mn：0.17-0.4%, Cu：0.01-0.025%, Ni：0.001-0.003%, Fe：0.003-0.006%, surplus Mg.
Specific implementation mode
With reference to embodiment, the present invention is described in further detail.
Embodiment 1
A kind of cryogenic treatment process improving magnesium alloy toughness, magnesium alloy used are AZ31, the group that alloying element contains
Divide and its mass percent is Al：2.5-3.0%, Zn：0.7-1.3%, Mn：0.17-0.2%, surplus Mg；Before use, pressing
Component and its content according to AZ31 magnesium alloys weigh raw material and raw material melting are obtained AZ31 magnesium alloy fused mass.
The cryogenic treatment process of the AZ31 magnesium alloys, is as follows：
(1) mold preheats
Mold is preheated, the mold after being preheated, wherein preheating temperature is 200-300 DEG C, preheating time 1-
2h；
(2) it pours into a mould and solidifies
AZ31 magnesium alloy fused mass, after alloy graining, the AZ31 magnesium alloys after being solidified are poured into a mould into the mold of preheating；Its
In, apply rotating excitation field in cast and process of setting, rotating excitation field, magnetic field intensity 0.5T are closed after alloy graining；
(3) solution treatment
AZ31 magnesium alloys after solidification are subjected to solution treatment, obtain the AZ31 magnesium alloys after solution treatment；Wherein, it is dissolved
The temperature of processing is 400-420 DEG C, and the soaking time of solution treatment is 6h；
(4) quenching treatment
AZ31 magnesium alloys after solution treatment are subjected to quenching treatment, are then cooled to room temperature, after obtaining quenching treatment
AZ31 magnesium alloys；Wherein, the mode of quenching treatment is to be put into 75 DEG C of water；
(5) subzero treatment
AZ31 magnesium alloys after quenching treatment are placed in liquid nitrogen and carry out subzero treatment, obtain AZ31 magnesium alloys；Wherein, deep
The temperature of cold treatment is -196--209 DEG C, and the time of subzero treatment is for 24 hours.
The alloy microscopic structure figure of the AZ31 magnesium alloys of preparation after the present embodiment subzero treatment is shown in that Fig. 5, crystal grain are average
Size is 110 μm, and tensile strength reaches 198MPa, and tensile strength improves 19.3% than natural coagulation AZ31 magnesium alloys, than rotation
Turn to solidify non-solution treatment under magnetic field and the alloy of non-subzero treatment improves 13.1%；
The elongation of the AZ31 magnesium alloys of preparation after the present embodiment subzero treatment is 23.0%, than natural coagulation AZ31 magnesium
Alloy improves 134.6%, and the magnesium alloy than solidifying non-solution treatment and non-subzero treatment under rotating excitation field improves 64.3%.
Embodiment 2
A kind of cryogenic treatment process improving magnesium alloy toughness, alloy used are AZ91, element that alloy contains and its
Mass percent is：Al：8.5-9.5%, Zn：0.45-0.91%, Mn：0.17-0.4%, Cu：0.01-0.025%, Ni：
0.001-0.003%, Fe：0.003-0.006%, surplus Mg.Before use, the component and its content according to AZ91 magnesium alloys claim
Raw material melting is obtained AZ91 magnesium alloy fused mass by content of starting materials.
The cryogenic treatment process of the AZ91 magnesium alloys, is as follows：
(1) mold preheats
Mold is preheated, the mold after being preheated, wherein preheating temperature is 100-200 DEG C, preheating time 1-
2h；
(2) it pours into a mould and solidifies
AZ91 magnesium alloy fused mass, after alloy graining, the AZ91 magnesium alloys after being solidified are poured into a mould into the mold of preheating；Its
In, apply rotating excitation field in cast and process of setting, rotating excitation field, magnetic field intensity 1T are closed after alloy graining；
(3) solution treatment
AZ91 magnesium alloys after solidification are subjected to solution treatment, obtain the AZ91 magnesium alloys after solution treatment；Wherein, it is dissolved
The temperature of processing is 400-420 DEG C, and the soaking time of solution treatment is 36h；
(4) quenching treatment
AZ91 magnesium alloys after solution treatment are subjected to quenching treatment, are then cooled to room temperature, after obtaining quenching treatment
AZ91 magnesium alloys；Wherein, the mode of quenching treatment is to be put into 80 DEG C of water；
(5) subzero treatment
AZ91 magnesium alloys after quenching treatment are placed in liquid nitrogen and carry out subzero treatment, obtain AZ91 magnesium alloys；Wherein, deep
The temperature of cold treatment is -196--209 DEG C, and the time of subzero treatment is for 24 hours.
The alloy microscopic structure figure of the AZ91 magnesium alloys of preparation after the present embodiment subzero treatment is shown in that Fig. 6, crystal grain are average
Size is 98 μm, and tensile strength reaches 255MPa, and tensile strength improves 70.0% than natural coagulation AZ91 magnesium alloys, than rotation
Turn to solidify non-solution treatment under magnetic field and the alloy of non-subzero treatment improves 56.4%；
The elongation of the AZ91 magnesium alloys of preparation after the present embodiment subzero treatment is 12.1%, than natural coagulation AZ91 magnesium
Alloy improves 188.1%, and the magnesium alloy than solidifying non-solution treatment and non-subzero treatment under rotating excitation field improves
142.0%.
Embodiment 3
A kind of cryogenic treatment process improving magnesium alloy toughness, magnesium alloy used are AZ31, the group that alloying element contains
Divide and its mass percent is Al：2.5-3.0%, Zn：0.7-1.3%, Mn：0.17-0.2%, surplus Mg；Before use, pressing
Component and its content according to AZ31 magnesium alloys weigh raw material and raw material melting are obtained AZ31 magnesium alloy fused mass.
The cryogenic treatment process of the AZ31 magnesium alloys, is as follows：
(1) mold preheats
Mold is preheated, the mold after being preheated, wherein preheating temperature is 300-400 DEG C, preheating time 1-
2h；
(2) it pours into a mould and solidifies
AZ31 magnesium alloy fused mass, after alloy graining, the AZ31 magnesium alloys after being solidified are poured into a mould into the mold of preheating；Its
In, do not apply rotating excitation field in casting process, applies rotating excitation field in process of setting, rotary magnetic is closed after alloy graining
, magnetic field intensity 5T；
(3) solution treatment
AZ31 magnesium alloys after solidification are subjected to solution treatment, obtain the AZ31 magnesium alloys after solution treatment；Wherein, it is dissolved
The temperature of processing is 390-420 DEG C, and the soaking time of solution treatment is 48h；
(4) quenching treatment
AZ31 magnesium alloys after solution treatment are subjected to quenching treatment, are then cooled to room temperature, after obtaining quenching treatment
AZ31 magnesium alloys；Wherein, the mode of quenching treatment is to be put into 85 DEG C of water；
(5) subzero treatment
AZ31 magnesium alloys after quenching treatment are placed in liquid nitrogen and carry out subzero treatment, obtain AZ31 magnesium alloys；Wherein, deep
The temperature of cold treatment is -196--209 DEG C, and the time of subzero treatment is 48h.
The alloy microscopic structure figure of the AZ31 magnesium alloys of preparation after the present embodiment subzero treatment is shown in that Fig. 7, crystal grain are flat
Equal size is 90 μm, and tensile strength reaches 183MPa, and tensile strength improves 10.2% than natural coagulation AZ31 magnesium alloys, than rotation
Turn to solidify non-solution treatment under magnetic field and the alloy of non-subzero treatment improves 4.6%；
The elongation of the AZ31 magnesium alloys of preparation after the present embodiment subzero treatment is 19%, is closed than natural coagulation AZ31 magnesium
Gold improves 93.9%, and the magnesium alloy than solidifying non-solution treatment and non-subzero treatment under rotating excitation field improves 35.7%.
Comparative example 1
A kind of cryogenic treatment process of magnesium alloy, with embodiment 1, the difference is that：
In step 2, cast and solidification are added without rotating excitation field, by the way of natural coagulation, do not carry out the solid solution of step 3
Processing, the subzero treatment of the quenching treatment of step 4 and step 5.
The as-cast structure figure of AZ31 magnesium alloys obtained is shown in that Fig. 1, the performance parameter of magnesium alloy obtained are shown in Table 1.
Comparative example 2
A kind of magnesium alloy treatment process, with embodiment 1, the difference is that：
The solution treatment of step 3, the subzero treatment of the quenching treatment of step 4 and step 5 are not carried out.
The as-cast structure figure of AZ31 magnesium alloys obtained is shown in that Fig. 2, the performance parameter of magnesium alloy obtained are shown in Table 1.
Comparative example 3
A kind of cryogenic treatment process of magnesium alloy, with embodiment 2, the difference is that：
In step 2, cast and solidification are added without rotating excitation field, by the way of natural coagulation, do not carry out the solid solution of step 3
Processing, the subzero treatment of the quenching treatment of step 4 and step 5.
The as-cast structure figure of AZ91 magnesium alloys obtained is shown in that Fig. 3, the performance parameter of magnesium alloy obtained are shown in Table 1.
Comparative example 4
A kind of magnesium alloy treatment process, with embodiment 2, the difference is that：
The solution treatment of step 3, the subzero treatment of the quenching treatment of step 4 and step 5 are not carried out.
The as-cast structure figure of AZ91 magnesium alloys obtained is shown in that Fig. 4, the performance parameter of magnesium alloy obtained are shown in Table 1.
The mechanical property of 1 AZ31, AZ91 magnesium alloy of table
In the embodiment above, the AZ systems magnesium alloy of use can also use Mg-Al systems, Mg- in other embodiments
Mn systems, Mg-Zn systems, Mg-RE systems, Mg-Al-Zn systems, Mg-Al-Mn systems, Mg-Zn-Zr systems, Mg-RE-Zn systems, Mg-RE-Cu systems,
Mg-RE-Ni systems, Mg-Gd-Zn-Zr systems or Mg-Gd-Y-Zr systems magnesium alloy.
It is that professional and technical personnel in the field is enable to realize or use this hair for the above description of the disclosed embodiments
It is bright, rather than to the restriction of the claims in the present invention.A variety of modifications to embodiment, the especially modification of magnesium alloy concrete type
It will be apparent to those skilled in the art.General Principle defined in the present invention can not depart from
In the case of the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention is not intended to be limited to this paper institutes
These embodiments shown, and it is to fit to widest range consistent with the principles and novel features disclosed in this article.
Claims (5)
1. a kind of cryogenic treatment process improving magnesium alloy toughness, which is characterized in that be as follows：
(1) mold preheats
Mold is preheated, the mold after being preheated, wherein preheating temperature is 100-400 DEG C；
(2) it pours into a mould and solidifies
Pour into a mould magnesium alloy fused mass into the mold of preheating, after alloy graining, the magnesium alloy after being solidified；Wherein, in entire mistake
Rotating excitation field, magnetic field intensity 0.5-5T can be applied in journey simultaneously, the mode for applying rotating excitation field is in following two methods
One kind：
The first：Apply rotating excitation field in cast and process of setting, rotating excitation field is closed after alloy graining；
Second：Do not apply rotating excitation field in casting process, applies rotating excitation field in process of setting, rotation is closed after alloy graining
Turn magnetic field；
(3) solution treatment
Magnesium alloy after solidification is subjected to solution treatment, obtains the magnesium alloy after solution treatment；Wherein, the temperature of solution treatment is
390-420 DEG C, the soaking time of solution treatment is 6-48h；
(4) quenching treatment
Magnesium alloy after solution treatment is subjected to quenching treatment, then cools to room temperature, obtains the magnesium alloy after quenching treatment；Its
In, the mode of quenching treatment is to be put into 75-85 DEG C of water；
(5) subzero treatment
Magnesium alloy after quenching treatment is placed in liquid nitrogen and carries out subzero treatment, obtains magnesium alloy；Wherein, the temperature of subzero treatment
It it is -196--209 DEG C, the time of subzero treatment is 24-48h.
2. improving the cryogenic treatment process of magnesium alloy toughness as described in claim 1, which is characterized in that the magnesium alloy is
It is the alloy that basic element is added that other elements form with magnesium；The other elements be Al, Mn, Zn, Zr, RE, Fe, Co, Mo,
One or more of Ni or Cu are mixed, and when for several mixing, mixed proportion is arbitrary ratio.
3. improving the cryogenic treatment process of magnesium alloy toughness as described in claim 1, which is characterized in that the magnesium alloy is
Complex magnesium alloy, specially Mg-Al systems, Mg-Mn systems, Mg-Zn systems, Mg-RE systems, Mg-Al-Zn systems, Mg-Al-Mn systems, Mg-Zn-
Zr systems, Mg-RE-Zn systems, Mg-RE-Cu systems, Mg-RE-Ni systems, Mg-Al-Mn-Zn systems, Mg-Gd-Zn-Zr systems or Mg-Gd-Y-Zr
One kind in system.
4. improving the cryogenic treatment process of magnesium alloy toughness as described in claim 1, which is characterized in that the step (1)
In, the preheating, preheating time 1-2h.
5. improving the cryogenic treatment process of magnesium alloy toughness as described in claim 1, which is characterized in that the step (2)
In, the magnesium alloy fused mass is to weigh raw material according to group of magnesium alloys distribution ratio, will be obtained after raw material progress melting.
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| CN109022974A (en) * | 2018-08-24 | 2018-12-18 | 重庆元和利泰镁合金制造有限公司 | A kind of magnesium alloy motor casing production method and motor housing |
| CN109084008A (en) * | 2018-08-27 | 2018-12-25 | 重庆元和利泰镁合金制造有限公司 | Magnesium alloy gear box casing and preparation method thereof |
| CN109735746A (en) * | 2019-03-01 | 2019-05-10 | 吉林大学 | A kind of raising aluminum alloy heat stability and superplastic preparation method |
| CN109837437A (en) * | 2019-02-27 | 2019-06-04 | 吉林大学 | A kind of alternating temperature controlled rolling preparation method for making low content magnesium alloy that there is uniform fine grain |
| CN112680587A (en) * | 2020-11-12 | 2021-04-20 | 淮阴工学院 | Method for improving hardness of aluminum-magnesium alloy welding wire |
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|---|---|
| CN108330422B (en) | 2019-10-01 |
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