CN106978579A - It is a kind of to improve the method for magnesium-rare earth high temperature creep-resistant property using unusual twin - Google Patents
It is a kind of to improve the method for magnesium-rare earth high temperature creep-resistant property using unusual twin Download PDFInfo
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- CN106978579A CN106978579A CN201710366053.9A CN201710366053A CN106978579A CN 106978579 A CN106978579 A CN 106978579A CN 201710366053 A CN201710366053 A CN 201710366053A CN 106978579 A CN106978579 A CN 106978579A
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- twin
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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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- 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
Abstract
It is a kind of to improve the method for magnesium-rare earth high temperature creep-resistant property using unusual twin, the present invention carries out pre-treatment in 15~75 ° of direction in 25~300 DEG C of lower edges and basal plane normal direction to magnesium-rare earth, true strain amount is 0.001~0.1, by predeformation into magnesium-rare earth preset { 10 12 } abnormality twin, the magnesium-rare earth for whetheing there is preset unusual twin is stretched respectively in 200~350 DEG C of temperature ranges or compression creep performance test, compared to the magnesium-rare earth without unusual twin, the magnesium-rare earth creep strain containing unusual twin is significantly reduced under equivalent service condition, secondary creep rates are decreased obviously, creep-resistant property is significantly improved.The present invention provides the technique that a kind of reasonable in design, equipment requirement is simple and convenient to operate, cost is low, efficiency high, stabilization improve magnesium-rare earth high temperature creep-resistant property.
Description
Technical field
The present invention relates to a kind of method using unusual twin improvement magnesium-rare earth high temperature creep-resistant property, specifically relate to
And be one kind magnesium-rare earth high temperature creep-resistant property is improved by the preset unusual twin organization of regulation control of pre-treatment
Method.Belong to nonferrous materials failure and protection technique field.
Background technology
Magnesium-rare earth (Mg-RE alloys) is being handed over due to having the advantages that density is small, higher than strong specific stiffness, aboundresources
There is increasingly extensive application prospect in the fields such as logical instrument, Aero-Space.In recent years, though the Strengthening and Toughening research of magnesium-rare earth takes
Greater advance is obtained, its intensity has been enough to compare favourably with aluminium alloy, but wherein high-temperature creep resistance is also deposited compared with aluminium alloy
In larger gap, as one of main bottleneck for limiting its application of being on active service.To lift its creep-resistant property, existing research is mainly led to
The addition for continuing to increase rare earth element is crossed, introduces precipitated phase to suppress dislocation motion and crystalline substance using means such as solid solution and Ageing Treatments
Boundary slides, and the proportion of conventional magnesium-rare earth part middle rare earth is up to 12~18wt.%.But the forming core of these sheet precipitated phases is close
Degree is low, hinders the effect of dislocation motion not good, and with creep temperature rise or active time increase, precipitated phase dissolves or slightly again
Change, the improvement to creep-resistant property is unsatisfactory.On the other hand, high tough magnesium-rare earth composition design, work are being selected
During skill prioritization scheme, recycling for material should be taken into account, its key is that simplifying alloying component and the trade mark, reduction has
Harmful, rare and noble element addition.Meanwhile, the addition for aggravating rare earth element not only increases alloy density, also causes production
Cost increases.It is expected that from now on the trend of research and development of magnesium alloy also by from traditional attention " composition and alloying " progressively to pay attention to " group
Knit optimize technique " transformation.Accordingly, it would be desirable to which a kind of simple, cost is low, can stablize improvement magnesium-rare earth high temperature creep-resistant property
Tissue modulation technique and method promote the military service application of magnesium-rare earth.
The content of the invention
Present invention aims at providing, a kind of technological design is reasonable, equipment requirement is simple and convenient to operate, cost is low, efficiency
It is high, stable to improve the method for magnesium-rare earth high temperature creep-resistant property.
In order to achieve the above object, the present invention is a kind of improves magnesium-rare earth high temperature creep-resistant property using unusual twin
Method, including：
Along basal plane easy glide direction at 25~300 DEG C, i.e., rare earth magnesium is closed in 15~75 ° of direction along with basal plane normal direction
Gold carries out pre-treatment, and deflection determines by the yield point of the alloy, and true strain is 0.001~0.1, by predeformation to dilute
{ 10-12 } preset in native magnesium alloy abnormality twin, using the inhibition of unusual twin On Dislocation Motion, suppresses magnesium alloy creep
The commutative Banach aglebra of process Dislocations and climb, so as to improve wherein high-temperature creep resistance；Described unusual twin is relatively normal
For { 10-12 } twin, normal twin refer to geometrically think with crystal grain basal plane normal direction in 0 ° stretching or with its in 90 ° compression when
{ 10-12 } twin produced；And along when magnesium-rare earth being stretched or compressed in 15~75 ° of direction with basal plane normal direction,
{ 10-12 } twin occurred is then { 10-12 } unusual twin.
The present invention is a kind of to improve the method for magnesium-rare earth high temperature creep-resistant property, the predeformation using unusual twin
Processing is using one kind in pre-stretching, compression, bending or at least one processing mode.
The present invention is a kind of to improve the method for magnesium-rare earth high temperature creep-resistant property, the predeformation using unusual twin
30~300 DEG C of temperature range, 0.001~0.3s of predeformation speed range-1, predeformation amount determines by the yield point of the alloy, very
Strain as 0.002~0.05.
The present invention is a kind of to improve the method for magnesium-rare earth high temperature creep-resistant property, the predeformation using unusual twin
Loading direction should be along the direction of basal plane easy glide, it is in 20~70 ° of direction to specifically refer to basal plane normal direction.
The present invention is a kind of to improve the method for magnesium-rare earth high temperature creep-resistant property, the high temperature using unusual twin
Creep-resistant property refers to the creep-resistant property in 200~350 DEG C of temperature ranges.
The present invention is a kind of to improve the method for magnesium-rare earth high temperature creep-resistant property, the rare earth magnesium using unusual twin
Alloy is selected from Mg-RE systems, Mg-RE-Zn systems alloy.
The present invention provide it is a kind of improve the method for magnesium-rare earth high temperature creep-resistant property using unusual twin, have with
Under several big advantages：
1st, present invention process need not aggravate the addition of rare earth, it is preferred that emphasis is to now organized regulation and control, and suitable material is extensive,
Environmentally friendly cost is low, and production efficiency is high；Using simple small deformation mode in existing tissue preset unusual twin, equipment requirement letter
It is single, easy to operate；
2nd, geometrically think with crystal grain (0001) basal plane normal direction in 0 ° of stretching or with it in 90 ° of { 10- produced when compressing
12 } twin is normal { 10-12 } twin, and this normal twin causes magnesium alloy work softening, and flow stress declines, to creep resistant
Performance is unfavorable；On the contrary, when with matrix basal plane normal direction in 15~75 ° of loadings, no matter stretch or compress, basal plane all easy glides,
Normal twin is difficult to occur, but is uneven shear strain caused by cooperative slip, in the crystal grain of these easy basal slips
{ 10-12 } the unusual twin for not following { 10-12 } normal twin condition occurs.
3rd, compared to precipitated phase and metastable normal twin, unusual twin is hindered basal plane position by basal plane dislocation pinning effect
Wrong commutative Banach aglebra and climb, heat endurance is improved, and is conducive to lifting yield stress, is expanded creep loading scope, postpone creep the
Three stages, the magnesium-rare earth state creep stage time containing unusual twin is long, can effectively break through current magnesium-rare earth middle and high
The relatively low bottleneck of warm creep-resistant property lifting generality.
4th, by preset unusual twin, strain of the magnesium-rare earth after creep stable state is reached can be reduced at least 1/3, stable state
Creep rate also reduces more than 1/2, and creep-resistant property is obviously improved.
In summary, rationally, flow is simple, and easy to operate, cost is low, efficiency high, to magnesium-rare earth for present invention process
High temperature croop property improvement is more obvious, stably, has a good application prospect.
Brief description of the drawings
Fig. 1 (a) is tissue after the casting preset twin of state Mg-6Gd-3Y-1Zn-0.4Zr magnesium alloys in the embodiment of the present invention 1
Distribution of orientations figure, wherein A, B, C represents the matrix containing unusual twin crystal grain, A ', B ', C ' is then unusual twin；Fig. 1 (b) is
State Mg-6Gd-3Y-1Zn-0.4Zr magnesium alloys are cast in the embodiment of the present invention 1 containing unusual twin grain matrix and twin
(0001) basal plane pole figure, wherein A, B, C, A ', B ', C ' it is corresponding with Fig. 1 (a)；
Fig. 2 (a) be the embodiment of the present invention 1 in whether there is preset unusual twin Mg-6Gd-3Y-1Zn-0.4Zr magnesium alloys 350
DEG C and 100MPa under compression creep curve comparison figure；Fig. 2 (b) be the embodiment of the present invention 1 in whether there is preset unusual twin Mg-
Creep rate of the 6Gd-3Y-1Zn-0.4Zr magnesium alloys under 350 DEG C and 100MPa is with creep time change curve comparison diagram；
Fig. 3 (a) is the orientation organized after the preset unusual twin of Mg-6Gd-3Y-0.4Zr hot rolled plates in the embodiment of the present invention 2
Distribution map；Fig. 3 (b) is (0001) basal plane of Mg-6Gd-3Y-0.4Zr hot rolled plates containing unusual twin crystal grain in the embodiment of the present invention 2
Pole figure；
Fig. 4 is Mg-6Gd-3Y-0.4Zr hot rolled plates before and after whetheing there is preset unusual twin in the embodiment of the present invention 2 at 300 DEG C
With the tensile creep curve comparison figure under 100MPa；
Fig. 5 (a) is the distribution of orientations figure organized after the preset unusual twin of Mg-2Y hot rolled plates in the embodiment of the present invention 3；Fig. 5
(b) it is (0001) the basal plane pole figure of Mg-2Y hot rolled plates containing unusual twin crystal grain in the embodiment of the present invention 3；
Fig. 6 (a) be whether there is in the embodiment of the present invention 3 preset unusual twin Mg-2Y magnesium alloys hot rolled plate at 200 DEG C and
Tensile creep curve comparison figure under 100MPa；Fig. 6 (b) closes to whether there is preset unusual twin Mg-2Y magnesium in the embodiment of the present invention 3
Creep rate of the golden hot rolled plate under 200 DEG C and 100MPa is with creep strain change curve comparison diagram.
Embodiment
The present invention is intended to further illustrate with reference to embodiments, is not intended to limit the present invention.
Embodiment 1
The present embodiment is casting state Mg-6Gd-3Y-1Zn-0.4Zr magnesium alloys using raw material.It casts state average crystal grain
Size is about 70 μm.Crystal grain orientation is analyzed based on electron backscattered technology of spreading out, is chosen and loaded according to distribution of orientations result
Direction.At 300 DEG C, precompression treatment is carried out to the test specimen along with 20~70 ° of directions of basal plane normal direction angle, compression speed is
0.003s-1, dependent variable is about 0.005~0.05.
Shown in Ya Hou test specimens tissue orientating distribution map such as Fig. 1 (a), by the A of grain matrix containing twin in figure, B, C divides with it
Not corresponding twin A ', B ', C ' (0001) basal plane pole distribution figure Fig. 1 (b) make.Fig. 1 (b) regions are divided, its
Middle LD (Loading Direction) is loading direction, and TD (Transverse Direction) is in 90 ° with loading direction
Laterally, when being compressed along LD, 1 is normal twin area, and 2 be unusual twin area.It can be found that these are brilliant containing twin from Fig. 1 (b)
The basal plane normal direction of grain is respectively 62 ° with loading direction angle, 30 °, 35 °, meets 15~75 ° of unusual twin criterions, in combination with
Matrix A in figure, B, C and twin A ', B ', C ' orientation relationship, it can be determined that the twin occurred in these crystal grain is anti-for { 10-12 }
Normal twin.
At 350 DEG C, its compression creep performance is tested under 100MPa, as a result as shown in Fig. 2 contrasting the compression of the two
Croop property curve understands that, although the first stage of preset twin test specimen is longer, creep rate is increased over time constantly
Reduction, is only the 1/10 of annealed state when reaching second stage steady-state process.By contrast, not preset twin test specimen is entering second
After stage, with the extension of time, creep strain begins to exceed preset twin test specimen, creep-resistant property is substantially not so good as preset twin
The magnesium-rare earth test specimen of test specimen.
Embodiment 2
The present embodiment is Mg-6Gd-3Y-0.4Zr hot rolled plates using raw material.After 500 DEG C of homogenizing annealing 2h, put down
Equal crystallite dimension is about 100 μm.In 30 DEG C, 0.03s-1Lower edge carries out pre- with 20~70 ° of directions of basal plane normal direction angle to the test specimen
Stretch processing, dependent variable is about 0.01~0.03.
The crystal grain orientation of test specimen after stretching is analyzed based on electron backscattered technology of spreading out, distribution of orientations Fig. 3 is obtained
(a), (0001) basal plane pole figure containing twin grain matrix is made and its region is divided, is stretched along loading direction
When, 3 be normal twin area, and 4 be unusual twin area, shown in such as Fig. 3 (b).It was found from Fig. 3 (b), loading direction and these crystal grain
(0001) basal plane normal direction angle is concentrated mainly on 20~70 °, meets 15~75 ° of unusual twin criterions, when being stretched along this direction
Existing twin is unusual twin.
At 300 DEG C, its tensile creep performance is tested under 100MPa, as a result as shown in figure 4, preset unusual twin
Magnesium alloy test specimen, its creep strain is only the 1/2 of not preset unusual twin test specimen, and creep-resistant property is obviously improved.
Embodiment 3
The present embodiment is Mg-2Y magnesium alloy hot rolled plates using raw material, after 450 DEG C of homogenizing annealing 2h, average crystalline substance
Particle size is about 120 μm.Pre- alternating bending processing is carried out to it at 150 DEG C.Due to the particularity of alternating bending mode of texturing, in
Property being organized in during alternating bending for layer both sides can be successively by the load of two opposite directions.Suitable bending side should be chosen
Formula, it is ensured that its crystal grain basal plane is in 15~60 ° with loading direction, and accumulative dependent variable is about 0.002~0.04.
Tissue orientating's distribution map 5 (a) after pre-treatment is analyzed and by (0001) base containing twin crystal grain
Face pole figure Fig. 5 (b) makes and zoning, in Fig. 5 (b) 5 be alternating bending during, when stretching or compress along loading direction
Corresponding normal twin area, 6 are unusual twin areas.It can be seen from Fig. 5 (b) these crystal grain basal plane limits be in 20~
In the range of 60 °, meet 15~75 ° of unusual twin criterions, either stretching or compression, the twin produced in these crystal grain is all
For unusual twin.
At 200 DEG C, its tensile creep performance is tested under 100MPa, as a result as shown in Figure 6.Deformed through alternating bending
The creep-resistant property of test specimen is greatly improved after preset unusual twin, and secondary creep rates are only not preset unusual twin test specimen
1/3, creep strain is only 1/2 without unusual twin test specimen.It can be seen that, the preset of unusual twin is rolled in plate to magnesium-rare earth
High-temperature creep resistance has very big improvement result.
Claims (6)
1. a kind of improve the method for magnesium-rare earth high temperature creep-resistant property using unusual twin, it is characterised in that：25~
Along basal plane easy glide direction at 300 DEG C, i.e., magnesium-rare earth is carried out at predeformation in 15~75 ° of direction along with basal plane normal direction
Reason, deflection determines by the yield point of the alloy, and true strain is 0.001~0.1, by predeformation into magnesium-rare earth it is preset
{ 10-12 } abnormality twin, using the inhibition of unusual twin On Dislocation Motion, suppresses the friendship of magnesium alloy creep process Dislocations
Slide and climb, so as to improve wherein high-temperature creep resistance；For described unusual twin is relatively normal { 10-12 } twin
, normal twin, which refers to, geometrically thinks in 0 ° of stretching or twin in 90 ° of { 10-12 } produced when compressing with it with crystal grain basal plane normal direction
It is brilliant；And along when magnesium-rare earth being stretched or compressed in 15~75 ° of direction with basal plane normal direction, { 10-12 } of appearance is twin
It is brilliant then be { 10-12 } unusual twin.
2. a kind of side using unusual twin improvement magnesium-rare earth high temperature creep-resistant property according to claim 1
Method, it is characterised in that：The pre-treatment is using a kind of processing mode in pre-stretching, compression, bending.
3. a kind of side using unusual twin improvement magnesium-rare earth high temperature creep-resistant property according to claim 1
Method, it is characterised in that：30~300 DEG C of the predeformation temperature range, 0.001~0.3s of predeformation speed range-1, predeformation amount
Determined by the yield point of the alloy, true strain is 0.002~0.05.
4. a kind of side using unusual twin improvement magnesium-rare earth high temperature creep-resistant property according to claim 1
Method, it is characterised in that：The loading direction of the predeformation should be along the direction of basal plane easy glide, and it is in 20 to specifically refer to basal plane normal direction
~70 ° of direction.
5. a kind of side using unusual twin improvement magnesium-rare earth high temperature creep-resistant property according to claim 1
Method, it is characterised in that：The high temperature creep-resistant property refers to the creep-resistant property in 200~350 DEG C of temperature ranges.
6. a kind of side using unusual twin improvement magnesium-rare earth high temperature creep-resistant property according to claim 1
Method, it is characterised in that：The magnesium-rare earth is selected from Mg-RE systems or Mg-RE-Zn systems alloy.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108690942A (en) * | 2018-06-22 | 2018-10-23 | 中南大学 | A method of improving magnesium alloy high temperature creep-resistant property using Grain Boundaries |
| CN113151720A (en) * | 2021-03-16 | 2021-07-23 | 中南大学 | Fatigue-resistant creep-resistant magnesium alloy and preparation method thereof |
| CN113373360A (en) * | 2021-07-19 | 2021-09-10 | 南昌航空大学 | Method for improving strength and corrosion resistance of AZ series wrought magnesium alloy |
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| CN103194702A (en) * | 2013-04-24 | 2013-07-10 | 重庆大学 | Induction heat treatment method for reducing tension asymmetry of magnesium alloy material |
| CN103898424A (en) * | 2014-03-27 | 2014-07-02 | 太原理工大学 | Method for refining magnesium alloy crystal grains |
| CN105256262A (en) * | 2015-10-29 | 2016-01-20 | 东北大学 | Method for improving aging hardening effect of Mg-Zn-Y alloy through presetting of twin crystals |
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2017
- 2017-05-22 CN CN201710366053.9A patent/CN106978579B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103194702A (en) * | 2013-04-24 | 2013-07-10 | 重庆大学 | Induction heat treatment method for reducing tension asymmetry of magnesium alloy material |
| CN103898424A (en) * | 2014-03-27 | 2014-07-02 | 太原理工大学 | Method for refining magnesium alloy crystal grains |
| CN105256262A (en) * | 2015-10-29 | 2016-01-20 | 东北大学 | Method for improving aging hardening effect of Mg-Zn-Y alloy through presetting of twin crystals |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108690942A (en) * | 2018-06-22 | 2018-10-23 | 中南大学 | A method of improving magnesium alloy high temperature creep-resistant property using Grain Boundaries |
| CN108690942B (en) * | 2018-06-22 | 2020-06-19 | 中南大学 | Method for improving high-temperature creep resistance of magnesium alloy by utilizing bent grain boundary |
| CN113151720A (en) * | 2021-03-16 | 2021-07-23 | 中南大学 | Fatigue-resistant creep-resistant magnesium alloy and preparation method thereof |
| CN113373360A (en) * | 2021-07-19 | 2021-09-10 | 南昌航空大学 | Method for improving strength and corrosion resistance of AZ series wrought magnesium alloy |
| CN113373360B (en) * | 2021-07-19 | 2022-10-21 | 南昌航空大学 | Method for improving strength and corrosion resistance of AZ series wrought magnesium alloy |
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