CN108690942A - A method of improving magnesium alloy high temperature creep-resistant property using Grain Boundaries - Google Patents
A method of improving magnesium alloy high temperature creep-resistant property using Grain Boundaries Download PDFInfo
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- CN108690942A CN108690942A CN201810652584.9A CN201810652584A CN108690942A CN 108690942 A CN108690942 A CN 108690942A CN 201810652584 A CN201810652584 A CN 201810652584A CN 108690942 A CN108690942 A CN 108690942A
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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
A method of improving magnesium alloy high temperature creep-resistant property using Grain Boundaries, the present invention carries out precompressed compression deformation in 400~550 DEG C of temperature ranges to as cast condition or deformation states magnesium alloy materials, true strain is 0.2~1.2, obtains the Grain Boundaries of different densities, and corresponding fine grain ratio is 0.2~0.6.It is respectively that 0.2~0.6 sample and 0.6 or more sample of fine grain ratio carry out tensile creep performance test to not deformed sample, fine grain ratio in 150~350 DEG C of temperature ranges, compared to not deformed and high fine grain than sample, the creep strain of Grain Boundaries sample of the fine grain ratio between 0.2~0.6 and secondary creep rates are substantially reduced under equal conditions, and creep-resistant property is significantly improved.The present invention provides that a kind of reasonable design, equipment requirement are simple, at low cost, efficient, applied widely stablize the method for improving magnesium alloy high temperature creep-resistant property.
Description
Technical field
The present invention relates to a kind of methods improving magnesium alloy high temperature creep-resistant property using Grain Boundaries, and in particular to
Being a kind of dynamic recrystallization generated using predeformation makes crystal boundary distortion improve performance of the magnesium alloy in follow-up creep process.
Belong to nonferrous materials failure and protection technique field
Background technology
With the raising of the development and people's environmental consciousness of economic level, modern society is to the light-weighted requirement of industrial design
Also more and more urgent.Magnesium alloy extremely agrees with current industrial lightweight, environmental protection due to its excellent proportion and comprehensive performance
Design concept has broad application prospects in industries such as Aeronautics and Astronautics, transport and 3C.Currently, magnesium alloy is in automobile and aviation
It has been successfully applied in space industry in the structural members such as case lid, instrument board, chair framework, door body, but answering in dynamical system
With also less.It works under conditions of high-temperature and high-stress for a long time to find out its cause, this is primarily due to the requirement of dynamical system parts,
This requires material with preferable high-temperature creep resistance, and the magnesium alloy being widely used on structural member developed at present
This standard is also not achieved.Usually in the actual production process, the leading mechanism in creep process is mainly dislocation creep mechanism,
Therefore the breach for improving creep resistance is concentrated mainly on absorption and inhibits dislocation.It is existing in order to improve corresponding croop property
Research is by largely introducing various rare earth elements, and in conjunction with means such as solid solution and timeliness, upper atom air mass and precipitation are utilized from microcosmic
The equal movement for inhibiting dislocation achievees the purpose that improve creep resistance, the rare earth element content even height of certain magnesium-rare earths
Up to 20wt.%.But pursue simply rare, noble element addition alloy density can be made to increase, cost increase or even certain
Element generates murder by poisoning to environment, it is difficult to recycle, this does not simultaneously meet economic and environment-friendly theory.On the other hand, single introducing
Equivalent structure is precipitated has certain limitation as the means for improving croop property, because in certain temperature and stress condition
Under, these precipitated phases drop low-alloyed instead since the difference with substrate performance is possible to be broken into the starting point of crack initiation
Croop property.Therefore, the research and development of high military service performance magnesium alloy are just turning to the direction of " organizational structure optimization " from " element alloyed ",
A kind of high-efficient simple, economic and environment-friendly tissue modulation method are made every effort to improve the creep-resistant property of magnesium alloy, to promote magnesium alloy
Military service application.
Invention content
Present invention aims at provide the method for improving magnesium alloy high temperature creep-resistant property using Grain Boundaries.
The present invention includes the following steps:
Precommpression deformation process is carried out to magnesium alloy materials, obtains Grain Boundaries tissue, Wrong Shipment is aligned using Grain Boundaries
Dynamic obstruction and absorption inhibits the diffusion and migration of the movement of creep process Dislocations, prevents the generation of crackle, and it is anti-to improve high temperature
Croop property.
The precommpression deformation process carries out pre-treatment in 400~550 DEG C of temperature ranges to magnesium alloy materials, in advance
0.001~0.3s of rate of deformation-1, true strain is 0.2~1.2, and intermediate anneal temperature is 400~520 DEG C, and the intermediate annealing time is
10~60min.
A kind of method improving magnesium alloy high temperature creep-resistant property using Grain Boundaries of the present invention, the Grain Boundaries group
Knit is made of the fine grain of different proportion and coarse-grain.Initial grain size is 50~200 μm, is produced by dynamic recrystallization after deformation
Raw fine grain ratio is 0.2~0.6, and fine grain crystallite dimension is 2~20 μm.
A kind of method improving magnesium alloy high temperature creep-resistant property using Grain Boundaries of the present invention, the high temperature
Creep-resistant property refers to the creep-resistant property in 150~350 DEG C of temperature ranges.
A kind of method being improved magnesium alloy high temperature creep-resistant property using Grain Boundaries of the present invention, the method are suitable for
The as cast condition and deformation states magnesium alloy of all the components.
A kind of method being improved magnesium alloy high temperature creep-resistant property using Grain Boundaries provided by the invention, is had following
Several big advantages:
1, the present invention is without improving the additive amount of rare earth, and focuses on the structure using compressive deformation organization of regulation control, therefore
Applied widely, equipment requirement is simple and convenient to operate, cost is relatively low, production efficiency is high.
2, common straight crystal boundary is compared, Grain Boundaries can effectively inhibit the diffusion that creep process Dislocations move and move
It moves, the thermal stability of material is made to improve, expand creep loading range, promote the creep resistance of material.
3, by inhibiting the movement of dislocation, Grain Boundaries induction creep mechanism to be changed into Grain Boundary Sliding by dislocation creep, from
And stress sensitive coefficients decline, creep rate declines.Enter the creep phase III during material creep containing Grain Boundaries
Time is postponed, and creep life significantly improves.
4, relative to the structures such as precipitated phase and twin are introduced, Grain Boundaries are not related to the change to basal body structure, to material
Matrix damage is small.
5, by forming Grain Boundaries, strain of the magnesium alloy after entering steady state creep can reduce by 1/3 or more, while stable state
Creep rate improves at least 1/2, and creep-resistant property is promoted apparent.
In conclusion present invention process is reasonable, flow is simple and convenient to operate, equipment cost requirement is low, production efficiency is high,
It is apparent to the improvement of magnesium alloy high temperature creep-resistant property, it has a good application prospect.
Description of the drawings
Fig. 1 is optical microstructure's photo figure before and after Mg-3Al-1Zn-0.2Mn magnesium alloy deformations.Wherein Fig. 1 (a) is
Not deformed sample tissue figure, Fig. 1 (b) are the sample tissue figure that true strain is 0.3, and Fig. 1 (c) is the sample group that true strain is 0.5
Knit figure.
Fig. 2 is tensile creep curve of the sample under 200 DEG C, 50MPa before and after Mg-3Al-1Zn-0.2Mn magnesium alloy deformations
Figure.The fine grain ratio that wherein four curves correspond to sample is respectively 0,0.2,0.4 and 0.8.
Fig. 3 is optical microstructure's photo before and after Mg-4Y magnesium alloy deformations.Wherein Fig. 3 (a) is not deformed sample tissue
Figure, Fig. 3 (b) is the sample tissue figure that true strain is 0.3, and Fig. 3 (c) is the sample tissue figure that true strain is 1.2.
Fig. 4 is tensile creep curve graph of the sample at 250 DEG C, 100MPa before and after Mg-4Y magnesium alloy deformations.Wherein four
The fine grain ratio that curve corresponds to sample is respectively 0,0.3,0.5 and 0.7.
Fig. 5 is optical microstructure's photo figure before and after Mg-9Gd-3Y-0.5Zr magnesium alloy deformations.Wherein Fig. 5 (a) is not
Sample tissue figure is deformed, Fig. 5 (b) is the sample tissue figure that true strain is 0.3, and Fig. 5 (c) is the sample tissue that true strain is 1.2
Figure.
Fig. 6 is tensile creep curve of the sample at 250 DEG C, 100MPa before and after Mg-9Gd-3Y-0.5Zr magnesium alloy deformations
Figure.The fine grain ratio that wherein four curves correspond to sample is respectively 0,0.2,0.5 and 0.8.
Fig. 7 is optical microstructure's photo figure before and after Mg-6Gd-3Y-1Zn-0.4Zr magnesium alloy deformations.Wherein Fig. 7 (a)
For not deformed sample tissue figure, Fig. 7 (b) is the sample tissue figure that true strain is 0.2, and Fig. 7 (c) is the sample that true strain is 0.9
Organization chart.
Fig. 8 is tensile creep song of the sample at 250 DEG C, 80MPa before and after Mg-6Gd-3Y-1Zn-0.4Zr magnesium alloy deformations
Line chart.The fine grain ratio that wherein four curves correspond to sample is respectively 0,0.2,0.5 and 0.8.
Specific implementation mode
It is intended to further illustrate the present invention with reference to embodiments, is not intended to limit the present invention.
Embodiment 1
The present embodiment is Mg-3Al-1Zn-0.2Mn magnesium alloy hot extrusion pressure bars using raw material.Its average grain size is about
50μm.Precompression treatment, compression speed 0.003s are carried out at 400 DEG C to sample-1, true strain 0.2,0.3 and 0.5 is right
It is 0.2,0.4 and 0.8 to answer fine grain ratio.
For test specimen tissue after pressure as shown in Figure 1, wherein Fig. 1 (a) is not deformed sample tissue, Fig. 1 (b) is that true strain is 0.3
Sample tissue, Fig. 1 (c) is the sample tissue that true strain is 0.5.Occur several tiny move at original grain boundary as seen from the figure
State recrystal grain, these dynamic recrystallizations promote the crystal boundary of original coarse-grain to generate different degrees of bending, with deformation extent
Increase, the ratio for generating fine grain increases therewith, and the bending degree of original grain boundary also incrementally increases.
At 200 DEG C, tensile creep performance test is carried out to these samples under 50MPa, the results are shown in Figure 2, compares them
Croop property curve it is found that the time of the sample first stage containing Grain Boundaries it is slightly longer than as-cast specimen, but enter second-order
Creep rate is obviously lower than not deformed sample after section, only the 1/2 of as-cast specimen.Meanwhile the sample that fine grain ratio is 0.4
Creep resistance be slightly better than 0.2 sample.In contrast, the creep resistance of the as-cast specimen without Grain Boundaries is obviously not as good as containing
The sample of Grain Boundaries, and when fine grain ratio rises to 0.8, creep rate greatly improves, and is just lost after sample only creep 40h
Steady fracture.
Embodiment 2
The present embodiment is that Mg-4Y rolls plate using raw material.Its average grain size is about 80 μm.Exist to one of which sample
450 DEG C, 0.003s-1Lower carry out precompression treatment, true strain 0.3.In order to obtain higher proportion of fine grained texture, another two groups of examinations
Sample carries out three step compression processing of speed change at 450 DEG C, and wherein first step compression speed is 0.003s-1, then connect with the 400 of 10min
DEG C intermediate annealing, then with 0.03s-1Second step compression is carried out, 400 DEG C of intermediate annealings with 30min are connect, finally with 0.3s-1's
Rate carries out third step compression, and total true strain is respectively 1.2 and 1.6, and the corresponding fine grain ratio of three is respectively 0.3,0.5 and
0.7。
For its deformed tissue as shown in figure 3, Fig. 3 (a) is not deformed sample tissue, Fig. 3 (b) is that true strain is 0.3
Sample tissue, Fig. 3 (c) are the sample tissue that true strain is 1.2.Several tiny dynamic recrystallizations are produced at original grain boundary
Crystal grain promotes the formation of Grain Boundaries, and crystal boundary bending degree increases with the rising of fine grain ratio.
Tensile creep performance test has been carried out to sample respectively at 250 DEG C, 100MPa.The results are shown in Figure 4 for it, from figure
In as can be seen that compared to fine grain ratio be 0.3 and 0.5 sample, without Grain Boundaries as-cast specimen in the compacted of second stage
Variable Rate higher.And when fine grain ratio rises to 0.7, creep rate rises rapidly.It can thus be appreciated that fine grain ratio is 0.3 He
The creep resistance of 0.5 sample is best, and under the conditions of current experiment, and the sample creep resistance that fine grain ratio is 0.5 is slightly better than
0.3 sample.
Embodiment 3
The present embodiment is as cast condition Mg-9Gd-3Y-0.5Zr using raw material.Its average grain size is about 200 μm.To it
In one group of sample at 520 DEG C, 0.003s-1Lower carry out precompression treatment, true strain 0.3.In order to obtain higher proportion of fine grain
Tissue, another two groups of samples carry out two step compression processing of speed change at 520 DEG C, and wherein first step compression speed is 0.003s-1, then connect
With 520 DEG C of intermediate annealings of 20min, finally with 0.3s-1Rate carry out second step compression, total true strain is respectively 1.2 Hes
1.6, the corresponding fine grain ratio of three is respectively 0.2,0.5 and 0.8.
For its deformed tissue as shown in figure 5, Fig. 5 (a) is not deformed sample tissue, Fig. 5 (b) is that true strain is 0.3
Sample tissue, Fig. 5 (c) are the sample tissue that true strain is 1.2.There is apparent crystal boundary bending in the compressed tissue of one step.Two
There is the chain fine grained texture for prolonging original grain boundary, crystal boundary bending degree higher in tissue after step contracting pressure.
Tensile creep performance test has been carried out to sample respectively at 250 DEG C, 100MPa.The results are shown in Figure 6 for it.By scheming
It is found that fine grain ratio 0.8 shows poor creep-resistant property, undeformed as cast condition material takes second place.In contrast, other two
Tissue containing Grain Boundaries shows preferable creep-resistant property, and the sample of wherein fine grain ratio 0.2 shows best anti-compacted
Become performance.
Embodiment 4
The present embodiment is as cast condition Mg-6Gd-3Y-1Zn-0.4Zr using raw material.Its average grain size is about 200 μm.
At 490 DEG C, 0.3s-1Under carry out precompression treatment to it, true strain 0.2,0.9 and 1.5, corresponding fine grain ratio is 0.2,
0.5 and 0.8.
For its deformed tissue as shown in fig. 7, Fig. 7 (a) is not deformed sample tissue, Fig. 7 (b) is that true strain is 0.2
Sample tissue, Fig. 7 (c) are the sample tissue that true strain is 0.9.There is different degrees of bending in deformed sample as seen from the figure
Crystal boundary, and occur more chain fine grained texture when deflection is larger, crystal boundary bending degree bigger.
At 250 DEG C, Experiment of extruding creep is carried out to sample under 80MPa.The results are shown in Figure 8, it can be seen from the figure that drawing
The sample creep resistance for entering Grain Boundaries is obviously promoted, and the sample phase that wherein fine grain ratio is 0.2 and 0.5 is less
Its secondary creep rates of sample containing Grain Boundaries improve 1/2 and 1/3 respectively, but when fine grain ratio is increased to 0.8, creep
Drag, which has, obviously to be declined.As it can be seen that the introducing of Grain Boundaries has effect aobvious the high temperature creep-resistant property of magnesium alloy
The improvement result of work, but when the excessive fine grain ratio of deflection is excessively high, the creep-resistant property of material can be reduced instead, when fine grain ratio
At 0.2~0.6, corresponding Grain Boundaries organization material obtains optimal creep-resistant property.
Claims (6)
1. a kind of method improving magnesium alloy high temperature creep-resistant property using Grain Boundaries, it is characterised in that:To magnesium alloy material
Material carries out precommpression deformation process, obtains Grain Boundaries tissue, the obstruction using Grain Boundaries On Dislocation Motion and absorption, inhibits
The diffusion and migration of creep process Dislocations movement, prevent the generation of crackle, improve high temperature creep-resistant property.
2. a kind of method being improved magnesium alloy creep-resistant property using Grain Boundaries according to claim 1, feature are existed
In:The precommpression deformation process is that common step compression process or Ordinary Compression technique and the speed change of conjunction intermediate annealing are more
Compression process is walked, precommpression deformation process temperature is 400~550 DEG C, 0.001~0.3s of predeformation rate-1, true strain 0.2
~1.2, intermediate anneal temperature is 400~520 DEG C, and the intermediate annealing time is 10~60min.
3. a kind of method being improved magnesium alloy creep-resistant property using Grain Boundaries according to claim 2, feature are existed
In:Precommpression deformation process temperature is 400~520 DEG C.
4. a kind of method being improved magnesium alloy creep-resistant property using Grain Boundaries according to claim 2, feature are existed
In:The Grain Boundaries tissue is made of the fine grain of different proportion and coarse-grain, and initial grain size is 50~200 μm, is become
After shape by dynamic recrystallization generate fine grain ratio be 0.2~0.6, fine grain crystallite dimension be 2~20 μm.
5. a kind of method improving magnesium alloy creep-resistant property using Grain Boundaries according to claim 1 or 2, feature
It is:The high temperature creep-resistant property refers to the creep-resistant property in 150~350 DEG C of temperature ranges.
6. a kind of method improving magnesium alloy creep-resistant property using Grain Boundaries according to claim 1 or 2, feature
It is:The magnesium alloy materials are as cast condition or deformation states magnesium alloy.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110129694A (en) * | 2019-05-30 | 2019-08-16 | 西南大学 | A method of improving magnesium alloy plate intensity and forming property |
| CN110438380A (en) * | 2019-08-13 | 2019-11-12 | 中南大学 | A kind of heat-proof combustion-resistant magnesium alloy and its deformation heat treatment method |
| CN117431394A (en) * | 2023-12-14 | 2024-01-23 | 深圳市中航盛世模切机械有限公司 | Universal device and method for adjusting heat treatment deformation |
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| CN117431394A (en) * | 2023-12-14 | 2024-01-23 | 深圳市中航盛世模切机械有限公司 | Universal device and method for adjusting heat treatment deformation |
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