CN108774720A - A kind of strong nanometer gradient magnesium alloy preparation method of superelevation - Google Patents
A kind of strong nanometer gradient magnesium alloy preparation method of superelevation Download PDFInfo
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- CN108774720A CN108774720A CN201810740436.2A CN201810740436A CN108774720A CN 108774720 A CN108774720 A CN 108774720A CN 201810740436 A CN201810740436 A CN 201810740436A CN 108774720 A CN108774720 A CN 108774720A
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- deformation
- magnesium alloy
- swaging
- nanometer gradient
- superelevation
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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
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Abstract
The present invention relates to a kind of strong nanometer gradient magnesium alloy preparation methods of superelevation.It is squeezed into bar after magnesium alloy semi-continuous casting ingot blank is carried out Homogenization Treatments, extruded bars are subjected to deformation of swaging, it is 0 ~ 400 DEG C to control temperature of swaging, it is 5 ~ 20% to control pass deformation, total deformation is 5 ~ 80%, control charging rate is 1 ~ 9mm/min, feedstock direction remains unchanged in deformation process, 3 ~ 30mm of diameter is made, the nanometer gradient magnesium alloy rod of long 1000 ~ 2000mm, 1 ~ 2 μm is gradually increased to by 30 ~ 100nm from bar center portion to edge crystallite dimension, in conjunction with follow-up aging strengthening model Alloy At Room Temperature tensile strength >=520MPa, yield strength >=450MPa, elongation after fracture >=8%.
Description
Technical field
The invention belongs to super high-strength magnesium alloy preparation fields, the more particularly to strong nanometer gradient magnesium alloy preparation method of superelevation.
Background technology
Magnesium alloy has many advantages, such as low-density, high specific strength, high specific stiffness, high-damping, as light structures material of new generation
Material, excellent loss of weight characteristic are of great significance to fields such as aerospace, communications and transportation.However existing magnesium alloy mechanical property
It can be relatively low, it is difficult to meet the needs of fields such as aerospace are for high performance material, thus improve magnesium alloy strength to be with toughness
The important goal of magnesium alloy research.Nanometer gradient metal material is the side for growing up prepare high-toughness metal material in recent years
Method, it is significant to magnesium alloy with high strength and ductility material preparation that exploration prepares nanometer gradient magnesium alloy new technology.However, preparing at present
The method of nanometer gradient magnesium alloy is deficient, continual exploitation nanometer gradient magnesium alloy novel preparation method.
Invention content
The invention reside in provide a kind of strong nanometer gradient magnesium alloy preparation method of superelevation.First use semi-continuous casting method system
Magnesium alloy ingot blank is taken, bar is squeezed into after ingot blank is carried out homogenization heat treatment, deformation of swaging then is carried out to extruded bars.It adopts
The nanometer gradient magnesium alloy crystallite dimension made from the method gradually increases from center portion to edge, center portion crystallite dimension be 30 ~
100nm, edge crystallite dimension are 1 ~ 2 μm, gained nanometer gradient magnesium alloy rod size be 3 ~ 30mm of diameter, it is long by 1000 ~
2000mm, in conjunction with follow-up aging strengthening model Alloy At Room Temperature tensile strength >=520MPa, yield strength >=450MPa, elongation after fracture
≥8%。
The strong nanometer gradient magnesium alloy technology of preparing of superelevation of the present invention, including step in detail below：
A. magnesium alloy ingot blank is produced using semi-continuous casting method；
B. magnesium alloy ingot blank is subjected to homogenization heat treatment, the blank after Homogenization Treatments is subjected to crimp；
C. extruded bars are subjected to deformation of swaging, control swage temperature be 0 ~ 400 DEG C, pass deformation is 5 ~ 20%, total deformation
It is 5 ~ 80%, control charging rate is 1 ~ 9mm/min, and feedstock direction remains unchanged in deformation process；
D. obtained nanometer gradient magnesium alloy is subjected to aging strengthening model.
The deformation of swaging, it is 0 ~ 200 DEG C to control temperature of swaging.
The deformation of swaging, it is 10 ~ 60% to control total deformation of swaging.
The deformation of swaging, control charging rate are 1 ~ 6mm/min.
The present invention has the following advantages：
1) extruded bars are subjected to deformation of swaging.First, high Steady-State security can be achieved in deformation of swaging, and reduces opening for magnesium alloy
Tendency is split, total deformation is improved；Secondly, high strain rate can be achieved in deformation of swaging, and high strain rate can be improved magnesium alloy and open
Dislocation density, high density dislocation induction magnesium alloy inside formation nanometer scale substructure and then the formation nanometer that can be accumulated before splitting
It is brilliant；Again, deformation of swaging can form different stress field along diameter of rod different parts, excite different deformation mechanisms, formed
Nanometer gradient magnesium alloy is made in the tissue of consecutive variations.It is in the main of nanometer gradient structure that most magnesium alloy, which swage and deforms,
Reason.
2) rational deformation parameter of swaging is explored.Wrought magnesium alloy tissue is determined by deformation parameter.It swages the change of deformation
Shape rate is higher, rate of deformation processing method low compared to other, such as the modes such as extruding, compression are easier that magnesium alloy is caused to be opened
It splits.Deformation parameter of suitably swaging is selected just to can guarantee acquisition nanometer magnesium alloy under the premise of alloy is indehiscent.It swages temperature
It is too low, pass deformation is excessively high, it is excessively high to easily cause stress raisers, causes to crack.Temperature of swaging is excessively high, shape in deformation process
At substructure it is oversized, cause newborn crystallite dimension coarse, it is difficult to be formed nanocrystalline.Pass deformation is too low, deformation collection
In on bar surface layer, it is difficult to deeply, it is difficult to formed inside bar nanocrystalline.Total deformation is too low, the nanocrystalline content of acquisition
Very few, alloy strength improves unobvious.As deflection increases, alloy constantly hardens, and plasticity declines, and alloy tearing tendency is more
Obviously, thus total deformation it is excessively high equally easily lead to alloy cracking.A large number of experiments exploration shows：Deformation parameter control is being swaged
In the range of 0 ~ 400 DEG C of temperature, pass deformation 5 ~ 20%, total deformation of swaging 5 ~ 80%, nanometer gradient structure just can get.
3) magnesium alloy ingot blank is produced using semi-continuous casting method, can reduce be mingled with, stomata, loose, centre burst etc. lack
It falls into.Control defects count can reduce its tearing tendency during deformation after unloading, improve magnesium alloy in deformation process of swaging
Formability, improve achievable total deformation of swaging, reduce adoptable temperature of swaging, and then reduce nanometer Mg alloy finished product
Crystallite dimension.Blank of swaging is prepared using pressing method, alloy defect quantity can be further decreased, reduce flaw size, improved
Achievable total deformation of swaging reduces adoptable temperature of swaging, and then reduces nanometer isomery magnesium alloy finished product crystallite dimension.
Specific implementation mode
Embodiment 1
A. magnesium alloy ingot blank is prepared using semi-continuous casting method, and carries out homogenization heat treatment；
B. the alloy blank after Homogenization Treatments is subjected to crimp, makes extruded bars average crystal grain by controlling extrusion process
Size is about 10 μm；
C. extruded bars are subjected to deformation of swaging at 25 DEG C, pass deformation is respectively 15%, 10%, 10%, and total deformation is
31%, charging rate 2mm/min, every time deformation feedstock direction is consistent, gained nanometer gradient magnesium alloy rod crystallite dimension
Gradually increase from center portion to edge, center portion crystallite dimension is 30 ~ 100nm, and edge crystallite dimension is 1 ~ 2 μm, rod product size
For diameter 20mm, long 2000mm；
D. the bar that will swage carries out aging strengthening model.
Mechanics Performance Testing is carried out to gained nanometer gradient magnesium alloy according to GB/T228-2002, the results are shown in Table 1.
Embodiment 2
A. magnesium alloy ingot blank is prepared using semi-continuous casting method, and carries out homogenization heat treatment；
B. the alloy blank after Homogenization Treatments is subjected to crimp；
C. extruded bars are subjected to deformation of swaging at 150 DEG C, pass deformation is respectively 15%, 15%, 10%, and total deformation is
35%, charging rate 3mm/min, every time deformation feedstock direction is consistent, gained nanometer gradient magnesium alloy rod crystallite dimension
Gradually increase from center portion to edge, center portion crystallite dimension is 50 ~ 100nm, and edge crystallite dimension is 1 ~ 2 μm, rod product size
For diameter 30mm, long 2000mm；
D. the bar that will swage carries out aging strengthening model.
Mechanics Performance Testing is carried out to gained nanometer gradient magnesium alloy according to GB/T228-2002, the results are shown in Table 1.
Embodiment 3
A. magnesium alloy ingot blank is prepared using semi-continuous casting method, and carries out homogenization heat treatment；
B. the alloy blank after Homogenization Treatments is subjected to crimp；
C. extruded bars are subjected to deformation of swaging at 200 DEG C, pass deformation is respectively 10%, 10%, 20%, and total deformation is
35%, charging rate 3mm/min, every time deformation feedstock direction is consistent, gained nanometer gradient magnesium alloy rod crystallite dimension
Gradually increase from center portion to edge, center portion crystallite dimension is 70 ~ 100nm, and edge crystallite dimension is 1 ~ 2 μm, rod product size
For diameter 14mm, long 1000mm；
D. the bar that will swage carries out aging strengthening model.
Mechanics Performance Testing is carried out to gained nanometer gradient magnesium alloy according to GB/T228-2002, the results are shown in Table 1.
Embodiment 4
A. magnesium alloy ingot blank is prepared using semi-continuous casting method, and carries out homogenization heat treatment；
B. the alloy blank after Homogenization Treatments is subjected to crimp；
C. extruded bars are subjected to deformation of swaging at 300 DEG C, pass deformation is respectively 20%, 10%, 5%, and total deformation is
32%, charging rate 3mm/min, every time deformation feedstock direction is consistent, gained nanometer gradient magnesium alloy rod crystallite dimension
Gradually increase from center portion to edge, center portion crystallite dimension is 50 ~ 100nm, and edge crystallite dimension is 1 ~ 2 μm, rod product size
For diameter 30mm, long 1500mm；
D. the bar that will swage carries out aging strengthening model.
Mechanics Performance Testing is carried out to gained nanometer gradient magnesium alloy according to GB/T228-2002, the results are shown in Table 1.
Embodiment 5
A. magnesium alloy ingot blank is prepared using semi-continuous casting method, and carries out homogenization heat treatment；
B. the alloy blank after Homogenization Treatments is subjected to crimp；
C. extruded bars are subjected to deformation of swaging at 300 DEG C, pass deformation is respectively 20%, 10%, 10%, 5%, and total deformation is
38%, charging rate 1mm/min, every time deformation feedstock direction is consistent, gained nanometer gradient magnesium alloy rod crystallite dimension
Gradually increase from center portion to edge, center portion crystallite dimension is 80 ~ 100nm, and edge crystallite dimension is 1 ~ 2 μm, rod product size
For diameter 22mm, long 1500mm；
D. the bar that will swage carries out aging strengthening model.
Mechanics Performance Testing is carried out to gained nanometer gradient magnesium alloy according to GB/T228-2002, the results are shown in Table 1.
1 nanometer gradient magnesium alloy room temperature tensile mechanical property of table
Claims (4)
1. a kind of strong nanometer gradient magnesium alloy preparation method of superelevation, it is characterised in that：Magnesium is produced using semi-continuous casting method to close
Ingot base will be squeezed into bar after ingot blank Homogenization Treatments, and deformation of swaging is carried out to extruded bars, control swage temperature be 0 ~
400 DEG C, pass deformation be that 5 ~ 20%, total deformation is 5 ~ 80%, control charging rate is 1 ~ 9mm/min, in deformation process into
Material direction remains unchanged, and the nanometer gradient magnesium alloy rod of 3 ~ 30mm of diameter, long 1000 ~ 2000mm, bar crystallite dimension is made
1 ~ 2 μm of edge is gradually risen to from 30 ~ 100nm of center portion.
2. the strong nanometer gradient magnesium alloy preparation method of superelevation according to claim 1, it is characterised in that：The deformation of swaging,
It is 0 ~ 200 DEG C to control temperature of swaging.
3. the strong nanometer gradient magnesium alloy preparation method of superelevation according to claim 1, it is characterised in that：The deformation of swaging,
It is 10 ~ 60% to control total deformation.
4. the strong nanometer gradient magnesium alloy preparation method of superelevation according to claim 1, it is characterised in that：The deformation of swaging,
Control charging rate is 1 ~ 6mm/min.
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| CN201810740436.2A CN108774720A (en) | 2018-07-07 | 2018-07-07 | A kind of strong nanometer gradient magnesium alloy preparation method of superelevation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115011824A (en) * | 2022-06-30 | 2022-09-06 | 中南大学 | High-strength and high-creep-resistance magnesium alloy and preparation method and application thereof |
| CN115323295A (en) * | 2022-08-17 | 2022-11-11 | 华融科创生物科技（天津）有限公司 | Method for preparing magnesium alloy bone nail bar by room-temperature rotary swaging and cryogenic treatment under alternating magnetic field and magnesium alloy bone nail finished product |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106756680A (en) * | 2016-11-23 | 2017-05-31 | 西北有色金属研究院 | A kind of processing method of high-strength magnesium alloy small-sized bar |
-
2018
- 2018-07-07 CN CN201810740436.2A patent/CN108774720A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106756680A (en) * | 2016-11-23 | 2017-05-31 | 西北有色金属研究院 | A kind of processing method of high-strength magnesium alloy small-sized bar |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115011824A (en) * | 2022-06-30 | 2022-09-06 | 中南大学 | High-strength and high-creep-resistance magnesium alloy and preparation method and application thereof |
| CN115323295A (en) * | 2022-08-17 | 2022-11-11 | 华融科创生物科技（天津）有限公司 | Method for preparing magnesium alloy bone nail bar by room-temperature rotary swaging and cryogenic treatment under alternating magnetic field and magnesium alloy bone nail finished product |
| CN115323295B (en) * | 2022-08-17 | 2023-02-10 | 华融科创生物科技（天津）有限公司 | Method for preparing magnesium alloy bone nail bar by room-temperature rotary swaging and cryogenic treatment under alternating magnetic field and magnesium alloy bone nail finished product |
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