CN108728713A - A kind of superelevation low rare earth nano gradient magnesium alloy preparation method by force - Google Patents
A kind of superelevation low rare earth nano gradient magnesium alloy preparation method by force Download PDFInfo
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- CN108728713A CN108728713A CN201810740442.8A CN201810740442A CN108728713A CN 108728713 A CN108728713 A CN 108728713A CN 201810740442 A CN201810740442 A CN 201810740442A CN 108728713 A CN108728713 A CN 108728713A
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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
- C22C23/06—Alloys based on magnesium with a rare earth metal as the next major constituent
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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 superelevation low rare earth nano gradient magnesium alloy preparation methods by force.The magnesium alloy atom percent composition is Mg-0.91 ~ 1.36Gd-0.87 ~ 1.29Y-0.06 ~ 0.14Zr,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 ~ 150 DEG C to control temperature of swaging,It is 5 ~ 20% to control pass deformation,Total deformation is 5 ~ 50%,Control charging rate is 1 ~ 3mm/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, is badly in need of nanometer gradient magnesium alloy novel preparation method.
Invention content
The object of the invention provides a kind of superelevation low rare earth nano gradient magnesium alloy preparation method by force.The magnesium alloy atom hundred
Divide than ingredient and is：Mg-0.91 ~ 1.36Gd-0.87 ~ 1.29Y-0.06 ~ 0.14Zr first produces magnesium using semi-continuous casting method and closes
Ingot base is squeezed into bar after ingot blank is carried out homogenization heat treatment, then carries out deformation of swaging to extruded bars.Using this side
Nanometer gradient magnesium alloy crystallite dimension made from method gradually increases from center portion to edge, and center portion crystallite dimension is 30 ~ 100nm, side
Portion's crystallite dimension is 1 ~ 2 μm, and gained nanometer gradient magnesium alloy rod size is 3 ~ 30mm of diameter, grows 1000 ~ 2000mm, in conjunction with rear
Continuous aging strengthening model Alloy At Room Temperature tensile strength >=520MPa, yield strength >=450MPa, elongation after fracture >=8%.
Superelevation of the present invention low rare earth nano gradient magnesium alloy preparation method, including step in detail below by force：
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 ~ 150 DEG C, pass deformation is 5 ~ 20%, total deformation
It is 5 ~ 50%, control charging rate is 1 ~ 3mm/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 50 ~ 150 DEG C to control temperature of swaging.
The deformation of swaging, it is 10 ~ 50% to control total deformation of swaging.
The deformation of swaging, control charging rate are 1 ~ 2mm/min.
Advantages of the present invention has：
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, achievable total deformation is improved；Secondly, high strain rate can be achieved in deformation of swaging, and high strain rate can be improved
The dislocation density that can be accumulated before magnesium alloy cracking, high density dislocation, which induce, forms nanometer scale substructure, in turn inside magnesium alloy
It is formed nanocrystalline；Again, deformation of swaging can form different stress field along diameter of rod different parts, excite different texturing machines
System, forms the tissue of consecutive variations, and nanometer gradient magnesium alloy is made.It is to obtain nanometer gradient group to the magnesium alloy deformation that swage
The main reason for knitting.
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 ~ 150 DEG C of temperature, pass deformation 5 ~ 20%, total deformation of swaging 5 ~ 50%, 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 tearing tendency of alloy during deformation after unloading, improve magnesium alloy in deformation process of swaging
In formability, improve achievable total deformation of swaging, reduce adoptable temperature of swaging, and then reduce nanometer magnesium alloy at
Product crystallite dimension.Blank of swaging is prepared using pressing method, alloy defect quantity can be further decreased, reduce flaw size, carried
High achievable total deformation of swaging reduces adoptable temperature of swaging, and then reduces nanometer isomery magnesium alloy finished product crystal grain ruler
It is very little.
Specific implementation mode
Embodiment 1
A. magnesium alloy atom percent composition used is Mg-1.36Gd-1.03Y-0.13Zr, is prepared using semi-continuous casting method
Magnesium alloy ingot blank, and carry 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 50 DEG C, pass deformation is respectively 20%, 10%, 10%, 5%, and total deformation is
38%, control charging rate is 1mm/min, and feedstock direction remains unchanged in deformation process, gained nanometer gradient magnesium alloy rod
Crystallite dimension gradually increases from center portion to edge, and center portion crystallite dimension is 30 ~ 100nm, and edge crystallite dimension is 1 ~ 2 μm, bar
Finished size is diameter 20mm, long 2000mm；
D. alloy is subjected to 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 atom percent composition used is Mg-1.36Gd-1.03Y-0.13Zr, is prepared using semi-continuous casting method
Magnesium alloy ingot blank, and carry 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%, 10%, 10%, and total deformation is
31%, control charging rate is 2mm/min, and feedstock direction remains unchanged in deformation process, gained nanometer gradient magnesium alloy rod
Crystallite dimension gradually increases from center portion to edge, and center portion crystallite dimension is 50 ~ 100nm, and edge crystallite dimension is 1 ~ 2 μm, bar
Finished size is diameter 30mm, long 2000mm；
D. alloy is subjected to 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 atom percent composition used is Mg-1.36Gd-1.03Y-0.13Zr, is prepared using semi-continuous casting method
Magnesium alloy ingot blank, and carry 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 20%, 10%, 10%, 5%, total deformation
It is 38%, control charging rate is 2mm/min, and feedstock direction remains unchanged in deformation process, gained nanometer gradient magnesium alloy bar
Material crystallite dimension gradually increases from center portion to edge, and center portion crystallite dimension is 70 ~ 100nm, and edge crystallite dimension is 1 ~ 2 μm, stick
Material finished size is diameter 14mm, long 1000mm；
D. alloy is subjected to 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 atom percent composition used is Mg-1.09Gd-0.69Y-0.14Zr, is prepared using semi-continuous casting method
Magnesium alloy ingot blank, and carry 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 100 DEG C, pass deformation is respectively 10%, 10%, 20%, and total deformation is
35%, control charging rate is 1mm/min, and feedstock direction remains unchanged in deformation process, gained nanometer gradient magnesium alloy rod
Crystallite dimension gradually increases from center portion to edge, and center portion crystallite dimension is 50 ~ 100nm, and edge crystallite dimension is 1 ~ 2 μm, bar
Finished size is diameter 30mm, long 1500mm；
D. alloy is subjected to 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 atom percent composition used is Mg-1.09Gd-0.69Y-0.14Zr, is prepared using semi-continuous casting method
Magnesium alloy ingot blank, and carry 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 100 DEG C, pass deformation is respectively 20%, 10%, 10%, 5%, total deformation
It is 38%, control charging rate is 2mm/min, and feedstock direction remains unchanged in deformation process, gained nanometer gradient magnesium alloy bar
Material crystallite dimension gradually increases from center portion to edge, and center portion crystallite dimension is 80 ~ 100nm, and edge crystallite dimension is 1 ~ 2 μm, stick
Material finished size is diameter 22mm, long 1500mm；
D. alloy is subjected to 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 superelevation low rare earth nano gradient magnesium alloy preparation method by force, magnesium alloy atom percent composition be Mg-0.91 ~
1.36Gd-0.87 ~ 1.29Y-0.06 ~ 0.14Zr, it is characterised in that including following procedure：Magnesium is produced using semi-continuous casting method
Alloy ingot blank 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 ~
150 DEG C, pass deformation be that 5 ~ 20%, total deformation is 5 ~ 50%, control charging rate is 1 ~ 3mm/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, gained nanometer gradient magnesium alloy is subjected to aging strengthening model, alloy
Room temperature tensile intensity >=520MPa, yield strength >=450MPa, elongation after fracture >=8%.
2. superelevation low rare earth nano gradient magnesium alloy preparation method by force according to claim 1, it is characterised in that：It is described to swage
Deformation, it is 50 ~ 150 DEG C to control temperature of swaging.
3. superelevation low rare earth nano gradient magnesium alloy preparation method by force according to claim 1, it is characterised in that：It is described to swage
Deformation, control total deformation are 10 ~ 50%.
4. superelevation low rare earth nano gradient magnesium alloy preparation method by force according to claim 1, it is characterised in that：It is described to swage
Deformation, control charging rate are 1 ~ 2mm/min.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111485138A (en) * | 2020-04-23 | 2020-08-04 | 中国科学院金属研究所 | Preparation method of cold-processed cobalt-based alloy rod wire |
| CN113174550A (en) * | 2021-03-12 | 2021-07-27 | 江苏大学 | Preparation method of ultra-high-strength high-toughness nano-gradient twin-crystal magnesium alloy |
| 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20090263271A1 (en) * | 2008-04-17 | 2009-10-22 | Changchun Institute Of Applied Chemistry Chinese Academy Of Sciences | High-strength, high-toughness, weldable and deformable rare earth magnesium alloy |
| CN102839339A (en) * | 2012-09-20 | 2012-12-26 | 中南大学 | Fabrication method of large-size block nano magnesium alloy |
| CN106148792A (en) * | 2016-08-17 | 2016-11-23 | 上海交通大学 | Wrought magnesium alloy of high intensity height Gd content and preparation method thereof |
-
2018
- 2018-07-07 CN CN201810740442.8A patent/CN108728713A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090263271A1 (en) * | 2008-04-17 | 2009-10-22 | Changchun Institute Of Applied Chemistry Chinese Academy Of Sciences | High-strength, high-toughness, weldable and deformable rare earth magnesium alloy |
| CN102839339A (en) * | 2012-09-20 | 2012-12-26 | 中南大学 | Fabrication method of large-size block nano magnesium alloy |
| CN106148792A (en) * | 2016-08-17 | 2016-11-23 | 上海交通大学 | Wrought magnesium alloy of high intensity height Gd content and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111485138A (en) * | 2020-04-23 | 2020-08-04 | 中国科学院金属研究所 | Preparation method of cold-processed cobalt-based alloy rod wire |
| CN113174550A (en) * | 2021-03-12 | 2021-07-27 | 江苏大学 | Preparation method of ultra-high-strength high-toughness nano-gradient twin-crystal magnesium alloy |
| 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 |
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