CN114000071A - Cryogenic rolling method of LZ91 magnesium-lithium alloy - Google Patents
Cryogenic rolling method of LZ91 magnesium-lithium alloy Download PDFInfo
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- CN114000071A CN114000071A CN202111268546.1A CN202111268546A CN114000071A CN 114000071 A CN114000071 A CN 114000071A CN 202111268546 A CN202111268546 A CN 202111268546A CN 114000071 A CN114000071 A CN 114000071A
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- lithium alloy
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- 238000005096 rolling process Methods 0.000 title claims abstract description 95
- 239000001989 lithium alloy Substances 0.000 title claims abstract description 81
- 229910000733 Li alloy Inorganic materials 0.000 title claims abstract description 79
- GCICAPWZNUIIDV-UHFFFAOYSA-N lithium magnesium Chemical compound [Li].[Mg] GCICAPWZNUIIDV-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 33
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000007788 liquid Substances 0.000 claims abstract description 18
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 18
- 238000001816 cooling Methods 0.000 claims description 17
- 239000011777 magnesium Substances 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 9
- 229910052744 lithium Inorganic materials 0.000 claims description 6
- 239000000314 lubricant Substances 0.000 claims description 5
- 239000000956 alloy Substances 0.000 description 12
- 229910045601 alloy Inorganic materials 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 9
- 238000005097 cold rolling Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 238000001878 scanning electron micrograph Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 229910019400 Mg—Li Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005501 phase interface Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- 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
-
- 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
Abstract
The invention provides a cryogenic rolling method of LZ91 magnesium-lithium alloy, which comprises the following steps: carrying out cryogenic treatment on the LZ91 magnesium-lithium alloy in liquid nitrogen, wherein the time of the cryogenic treatment is not more than 20 h; and rolling the cryogenic treated LZ91 magnesium-lithium alloy. According to the method provided by the invention, the LZ91 magnesium-lithium alloy is subjected to cryogenic treatment before rolling, and second phases generated by rolling are uniformly precipitated, so that the strength of the magnesium-lithium alloy can be improved, and the mechanical properties of the LZ91 magnesium-lithium alloy can be improved.
Description
Technical Field
The invention relates to the technical field of alloys, in particular to a cryogenic rolling method of an LZ91 magnesium-lithium alloy.
Background
The Mg-Li alloy is light (rho is 1.45-1.65 g/cm)3) Is one of the preferred materials. The magnesium-lithium alloy has high specific strength, specific rigidity, damping and shock absorbing performance, electromagnetic shielding performance, high-energy particle penetration resistance, and good low-temperature toughness and low-temperature processability. Therefore, the magnesium-lithium alloy has great development potential in the fields of aerospace, weapon industry, automobile, 3C industry and the like. Although magnesium-lithium alloys have numerous advantages and wide applications, the lower strength severely limits their applications. Therefore, it is very important to develop a processing method capable of effectively improving the mechanical properties of the magnesium-lithium alloy.
The lithium content of the LZ91(Mg-9Li-1Zn) magnesium-lithium alloy is between 5 and 11 weight percent, and the alloy is a typical dual-phase magnesium-lithium alloy. The dual-phase magnesium-lithium alloy has good plastic deformation capability and corrosion resistance, and the good plastic deformation capability enables the LZ91 magnesium-lithium alloy to be rolled at low temperature. Compared with a single-phase magnesium-lithium alloy (bcc structure) with high Li content, the two-phase magnesium-lithium alloy has a two-phase structure, so that the alpha-Mg phase and the beta-Li phase can be subjected to mutual coordinated deformation in the plastic deformation process, and the plastic deformation is easier to perform. In the prior art, the rolling of the LZ91 magnesium-lithium alloy is carried out at room temperature, and a roller is not preheated in the whole rolling process, but the LZ91 magnesium alloy material obtained by the room-temperature rolling process has lower strength.
Disclosure of Invention
In view of the above, the invention provides a deep cold rolling method of an LZ91 magnesium-lithium alloy, which improves the strength of an LZ91 magnesium-lithium alloy.
The invention provides a cryogenic rolling method of LZ91 magnesium-lithium alloy, which comprises the following steps:
carrying out cryogenic treatment on the LZ91 magnesium-lithium alloy in liquid nitrogen, wherein the time of the cryogenic treatment is not more than 20 h;
and rolling the cryogenic treated LZ91 magnesium-lithium alloy.
Preferably, the time of the cryogenic treatment is 4 to 20 hours.
Preferably, during the rolling process, the LZ91 magnesium-lithium alloy is placed in liquid nitrogen for cooling after each rolling process.
Preferably, the time for placing the LZ91 magnesium-lithium alloy in liquid nitrogen after each rolling pass is not less than 10 minutes.
Preferably, the rolling speed is 10 mm/s.
Preferably, the rolling reduction rate of each pass is 8-10%.
Preferably, the LZ91 magnesium lithium alloy comprises the following elemental composition:
the content of Li is 8.0-10.0 wt%;
the Zn content is 0.5-1.5 wt%;
and the balance of Mg.
Preferably, the purity of the Li and Zn is 99.99%.
Preferably, the rolls used in the rolling process are not preheated.
Preferably, no lubricant is used during the rolling.
The invention provides a cryogenic rolling method of LZ91 magnesium-lithium alloy, which comprises the following steps: carrying out cryogenic treatment on the LZ91 magnesium-lithium alloy in liquid nitrogen, wherein the time of the cryogenic treatment is not more than 20 h; and rolling the cryogenic treated LZ91 magnesium-lithium alloy. According to the method provided by the invention, the LZ91 magnesium-lithium alloy is subjected to cryogenic treatment before rolling, the solid solubility of Li element and Zn element in alpha-Mg is reduced due to the rapid reduction of the temperature, so that the elements are precipitated in the form of a second phase, and meanwhile, the temperature of the cryogenic treatment is about-198 ℃, so that the precipitated second phase particles are very fine, are in a nano level, are in dispersed distribution and are not easy to grow. The second phase at nanometer level can play a role of strengthening the second phase in the rolling process. The uniform precipitation of the second phase can improve the strength of the magnesium-lithium alloy and simultaneously increase the plasticity of the magnesium-lithium alloy, and improve the mechanical properties of the LZ91 magnesium-lithium alloy. The experimental result shows that compared with the traditional room temperature rolling, the tensile strength of the deep-cooling 4h rolling sample and the deep-cooling 20h rolling sample obtained by the embodiment of the invention are 191MPa and 167MPa respectively, and are respectively improved by about 38 percent and 21 percent compared with the tensile strength of the room temperature rolling sample (138 MPa).
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a stress-strain diagram of an LZ91 deep cold 4h rolled sample obtained in example 1 of the present invention;
FIG. 2 is a stress-strain diagram of an LZ91 deep cold 20h rolled sample obtained in example 2 of the present invention;
FIG. 3 is a stress-strain comparison graph of rolled samples at different cryogenic times for examples of the present invention and comparative examples;
FIG. 4 is a photograph of the metallographic structure of the alloy after the deep cooling rolling of LZ91, wherein (a) the cold rolling in comparative example 1 was carried out for 4 passes, (b) the deep cooling in example 1 was carried out for 4h +4 passes, and (c) the deep cooling in example 2 was carried out for 20h +4 passes
FIG. 5 is SEM images of 4 passes of rolling at different cryogenic times, wherein (a) in example 1, 4h +4 passes of cryogenic rolling, and (b) in example 2, 20h +4 passes of cryogenic rolling.
Detailed Description
The invention provides a cryogenic rolling method of LZ91 magnesium-lithium alloy, which comprises the following steps:
carrying out cryogenic treatment on the LZ91 magnesium-lithium alloy in liquid nitrogen, wherein the time of the cryogenic treatment is not more than 20 h;
and rolling the cryogenic treated LZ91 magnesium-lithium alloy.
The composition and source of the LZ91 magnesium-lithium alloy are not particularly limited in the invention, and LZ91 magnesium-lithium alloy which is well known to those skilled in the art can be adopted. In an embodiment of the present invention, the LZ91 magnesium lithium alloy preferably comprises the following elemental composition: 8.0 wt% -10.0 wt% of Li; 0.5 to 1.5 wt% of Zn; the balance of Mg; in one embodiment of the invention, the elemental composition of the LZ91 magnesium lithium alloy may be: 8.921 wt% Li, 1.012 wt% Zn and the balance Mg. In the present invention, the purity of Li and Zn is preferably 99.99%.
The shape of the LZ91 magnesium lithium alloy is not particularly limited, and an LZ91 magnesium lithium alloy plate can be specifically used as a sample in the embodiment of the invention; the LZ91 magnesium lithium alloy sheet may have a thickness of 5.6mm and an initial width of 45 mm.
The method comprises the step of carrying out cryogenic treatment on the LZ91 magnesium-lithium alloy in liquid nitrogen, and specifically comprises the step of soaking the LZ91 magnesium-lithium alloy in the liquid nitrogen. In the present invention, the time of the cryogenic treatment is not more than 20 hours, preferably 4 to 20 hours, and in the specific embodiment of the present invention, 4 or 20 hours can be specifically mentioned. In the invention, the volume of the alloy is reduced along with the sharp reduction of the temperature through the cryogenic treatment in the liquid nitrogen, the lattice distortion of the beta-Li phase is about serious, and simultaneously, the solid solubility of each element in the alloy is reduced along with the sharp reduction of the temperature, which provide thermodynamic conditions for the precipitation of a second phase. These second phase particles have a very important role in improving the strength of the dual-phase magnesium-lithium alloy.
After the cryogenic treatment, the invention rolls the LZ91 magnesium-lithium alloy after the cryogenic treatment. In the invention, the rolling may be single-pass rolling or multi-pass rolling, for example, one-pass rolling, two-pass rolling, three-pass rolling or four-pass rolling, and those skilled in the art can select an appropriate rolling pass according to actual needs. In the present invention, the rolling speed is preferably 10 mm/s; the reduction per pass is preferably 8% to 10%, and may be specifically 8%, 9% or 10% in embodiments of the invention. The rolling equipment is not particularly limited by the present invention, and rolling equipment known to those skilled in the art can be used, for example, in one embodiment of the present invention, rolls having a diameter of 120mm are used, and the rotation speed of the rolls is preferably 1250 rpm. In the embodiment of the invention, the roller is not preheated and does not adopt any lubricant in the whole rolling process.
In the invention, in the rolling process, the LZ91 magnesium-lithium alloy is preferably placed in liquid nitrogen for cooling after each rolling; in order to fully cool the sample, the time for placing the LZ91 magnesium-lithium alloy in liquid nitrogen is not less than 10 minutes after each pass of rolling.
In the invention, cooling (namely deep cooling) is carried out in liquid nitrogen between each pass of rolling, so that the deep cooling rolling process can be ensured. The same cryogenic temperature is kept before and after the plate is rolled, so that the growth of crystal grains and the solid solution of precipitates caused by the temperature rise during the next rolling are avoided, and the hardness of the plate is reduced.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
It should be noted that, in the case of no conflict, the features in the following embodiments and examples may be combined with each other; moreover, all other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present disclosure without any creative effort belong to the protection scope of the present disclosure.
It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the disclosure, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
Example 1
The method comprises the following steps of carrying out deep cold rolling on an LZ91 magnesium lithium alloy sample, wherein the composition of an LZ91 magnesium lithium alloy is as follows: 8.921 wt% of Li, 1.012 wt% of Zn and Mg, the rest, the purity of Li and Zn is 99.99%; the LZ91 Mg-Li alloy sample was a block sample having a thickness of 5.6mm and an initial width of 45 mm;
4 LZ91 magnesium-lithium alloy samples are soaked in liquid nitrogen for 4h of cryogenic treatment; rolling 4 LZ91 magnesium-lithium alloy samples subjected to cryogenic treatment, respectively performing one-pass rolling, two-pass rolling, three-pass rolling and four-pass rolling on the 4 samples at the rolling speed of 10mm/s, wherein the reduction rate of each pass of rolling is 8%, and soaking the samples in liquid nitrogen for 10 minutes before performing the next pass of rolling to fully cool the samples. In the whole rolling process, the roller is not preheated and does not adopt any lubricant.
According to the invention, the stress-strain test is carried out on the obtained cryogenic 4h + rolled sample, the result is shown in figure 1, and as can be seen from figure 1, the LZ91 magnesium lithium alloy plate after cryogenic 4h +4 passes of rolling has higher mechanical property, the tensile strength is 191MPa, the elongation is 95%, the internal structure of the plate after cryogenic treatment has nanoscale second phases and twin crystal structures, and the finely dispersed second phases can play the roles of pinning dislocation and hindering grain boundary sliding in the plate deformation process, so that the mechanical property of the alloy can be improved.
The metallographic structure of the sample obtained by the test of the present invention is shown in fig. 4, wherein (b) in fig. 4 is a metallographic structure diagram of a 4h + 4-pass rolled sample obtained by the cryogenic treatment of example 1, and as can be seen from fig. 4(b), the LZ91 alloy is basically composed of an off-white α -Mg phase and a dark gray β -Li phase, and the α -Mg phase is basically distributed in a band shape along the rolling direction, but is broken compared with the α -Mg phase in an unrolled state (fig. 4 (a)).
According to the invention, the obtained sample is subjected to scanning electron microscope test, the obtained SEM image is shown in FIG. 5, FIG. 5(a) is the SEM image of the 4h + 4-pass rolling sample subjected to cryogenic treatment in example 1, and as can be seen from FIG. 5(a), the nano-scale particle precipitated phase is distributed in the phase interface of the alpha-Mg phase and the beta-Li phase and the inside of the beta-Li phase.
Example 2
For the deep cooling 20h +4 pass rolling of the LZ91 dual-phase magnesium-lithium alloy:
the plate sample and the LZ91 magnesium-lithium alloy sample in the embodiment 1 have the same composition and size, the rolling process is carried out at room temperature, the diameter of a roller is 120mm, the rotating speed is 1250 r/min, the reduction of each pass of the alloy is 8%, the rolling process is respectively carried out for one pass, two passes, three passes and four passes, and before the next pass of rolling, the sample is soaked in liquid nitrogen for 10 minutes to be fully cooled. In the whole rolling process, the roller is not preheated and does not adopt any lubricant.
According to the invention, the stress-strain test is carried out on the obtained cryogenic 20h + rolled sample, and the result is shown in figure 2, and as can be seen from figure 2, the LZ91 magnesium-lithium alloy plate obtained by cryogenic 20h +4 passes of rolling has better mechanical property, the ultimate tensile strength is 167MPa, and the elongation is 92%.
The metallographic structure of the sample obtained by the test of the invention is shown in fig. 4, and fig. 4(c) is a metallographic structure diagram of the sample rolled by 20h +4 passes in the cryogenic treatment of the example 2, and as can be seen from fig. 4(c), the alpha-Mg phase is unevenly distributed, and part of the alpha-Mg phase is gradually spheroidized. As can be seen in comparison with fig. 4(b) of example 1: after 20h of cryogenic treatment, the second phase particles precipitated in the alloy are larger than those precipitated after 4h of cryogenic treatment, and the effect of the second phase particles on dislocation slip in the deformation process is smaller.
According to the invention, the obtained sample is subjected to scanning electron microscope test, the obtained SEM image is shown in FIG. 5, FIG. 5(b) is the SEM image of the sample rolled by 20h +4 times of cryogenic treatment in example 2, and as can be seen from FIG. 5(b), most of the second phase is distributed along the interface of an alpha-Mg phase and a beta-Li phase, part of granular precipitates are distributed in the beta-Li phase, and part of the second phase distributed along the phase interface is grown.
Comparative example 1:
the LZ91 magnesium-lithium alloy is subjected to cryogenic treatment for 20 hours and is not rolled:
the plate sample and the LZ91 magnesium lithium alloy sample in the embodiment 1 have the same composition and size, the deep cooling process is the same, and the sample is subjected to a stress-strain test.
The ultimate tensile strength of the LZ91 magnesium-lithium alloy plate obtained by the invention is 150MPa, and the elongation is 87%. The strength of the comparative magnesium-lithium alloy material was lower than that of example 1, which shows that the strength of LZ91 magnesium-lithium alloy sheet can be effectively improved by using the deep cold rolling process.
According to the invention, the metallographic structure of the sample is obtained through the test, as shown in FIG. 4, (a) is the metallographic structure of the non-rolled sample which is subjected to cryogenic treatment for 20h in comparative example 1, and as can be seen from FIG. 4, (a), the gray alpha-Mg phase is distributed in a dark gray beta-Li phase matrix in a band shape along the rolling direction.
Comparative example 2
For the conventional rolling of the LZ91 magnesium-lithium alloy at room temperature, the normal-temperature rolling is directly carried out without cryogenic treatment:
the plate sample has the same composition and size as the LZ91 magnesium-lithium alloy sample in example 1, the rolling process is carried out at room temperature, the diameter of the roller is 120mm, the rotating speed is 1250 r/min, the reduction of the alloy per pass is 8%, and four passes of rolling are carried out.
According to the invention, the stress-strain test is carried out on the obtained rolling sample, the result is shown in figure 3, the stress-strain curve of the deep cooling 4h + 4-pass rolling sample in the example 1 and the stress-strain curve of the deep cooling 20h + 4-pass rolling sample in the example 2 are also shown in figure 3, as can be seen from figure 3, the mechanical property of the sample which is not subjected to the deep cooling treatment in the comparative example 2 is the worst, the ultimate tensile strength of the LZ91 magnesium-lithium alloy plate obtained in the comparative example 2 is 138MPa, and the elongation is 120%. The strength of the comparative magnesium-lithium alloy material was lower than that of examples 1 and 2, which shows that the strength of the LZ91 magnesium-lithium alloy sheet can be effectively improved by using the deep cold rolling process.
In summary, the following steps: the deep cold rolling method of the LZ91 magnesium lithium alloy provided by the invention can precipitate a fine nano-scale second phase in the LZ91 magnesium lithium alloy, the fine dispersed second phase can block dislocation slip in the subsequent rolling process, the strength and the plasticity of the alloy can be improved, and the effect of the embodiment also shows that the tensile strength and the elongation of the LZ91 magnesium lithium alloy plate prepared by the invention are greatly improved. Moreover, the method provided by the invention has the advantages of simple and reliable process, high efficiency, easiness in popularization and important practical value, and is suitable for processing large-scale magnesium-lithium alloy industrial samples.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
- The deep cooling rolling method of LZ91 magnesium-lithium alloy includes the following steps:carrying out cryogenic treatment on LZ91 magnesium-lithium alloy in liquid nitrogen, wherein the time of the cryogenic treatment is not more than 20hAnd rolling the cryogenic treated LZ91 magnesium-lithium alloy.
- 2. The cryogenic rolling method according to claim 1, wherein the time of the cryogenic treatment is 4 to 20 hours.
- 3. The cryogenic rolling method according to claim 1, wherein during the rolling, the LZ91 magnesium-lithium alloy is placed in liquid nitrogen for cooling after each rolling pass.
- 4. The cryogenic rolling method according to claim 2, wherein the time for the LZ91 magnesium-lithium alloy to be placed in liquid nitrogen after each pass of rolling is not less than 10 minutes.
- 5. The cryogenic rolling method according to any one of claims 1 to 4, wherein the rolling speed is 10 mm/s.
- 6. The cryogenic rolling method according to any one of claims 1 to 4, wherein the reduction rate of each pass is 8% to 10%.
- 7. The cryogenic rolling method according to claim 1, wherein the LZ91 magnesium lithium alloy comprises the following elemental composition:the content of Li is 8.0-10.0 wt%;the Zn content is 0.5-1.5 wt%;and the balance of Mg.
- 8. The cryogenic rolling method according to claim 7, wherein the purity of Li and Zn is 99.99%.
- 9. The cryogenic rolling method according to claim 1, wherein rolls used in the rolling process are not preheated.
- 10. The cryogenic rolling method according to claim 1 or 9, wherein no lubricant is used in the rolling process.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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