CN110438381A - A kind of magnesium alloy and its deformation heat treatment method of high tough high electromagnetic shielding performance - Google Patents
A kind of magnesium alloy and its deformation heat treatment method of high tough high electromagnetic shielding performance Download PDFInfo
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- CN110438381A CN110438381A CN201910742455.3A CN201910742455A CN110438381A CN 110438381 A CN110438381 A CN 110438381A CN 201910742455 A CN201910742455 A CN 201910742455A CN 110438381 A CN110438381 A CN 110438381A
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- magnesium alloy
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- shielding performance
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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
- C22F1/002—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
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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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- Crystallography & Structural Chemistry (AREA)
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Abstract
The invention discloses the magnesium alloy and its deformation heat treatment method of a kind of high tough high electromagnetic shielding performance, the mass percent of magnesium alloy each element is Gd:3~16%, Ca:0.2~1%, Zn:0.02~0.2%, and mass ratio >=3 of Ca/Zn；Or mass ratio >=0.2 of Gd:3~16%, Ca:0.2~1%, Al:0.2~3%, and Ca/Al, remaining is Mg.Magnesium alloy ingot blank is prepared through semi-continuous casting, hot rolling or is hot extruded into the plate of 5~25mm thickness and after solution treatment, carries out timeliness, water quenching, the deformation that true strain is 0.02~0.1, then timeliness, water quenching.The honeycomb microstructure that precipitated phase containing cylinder, cylinder dislocation and basal plane precipitated phase, basal plane dislocation collectively form inside alloy of the present invention, it is significant to mechanical property and the synchronous improvement of electromagnetic shielding effect, breach the bottleneck that magnesium alloy high-strength tenacity and high electromagnetic wave shielding can not get both.
Description
Technical field
The present invention relates to the magnesium alloys and its deformation heat treatment method of a kind of high tough high electromagnetic shielding performance, and in particular to
Be a kind of to be heat-treated by low temperature deformation to magnesium alloy introducing cylinder precipitated phase, cylinder dislocation and basal plane precipitated phase, basal plane position
Mistake forms cellular internal microstructure, to prepare the magnesium alloy with high-strength tenacity and high electromagnetic wave shielding, category has
Non-ferrous metal material and processing technique field.
Background technique
With the continuous development of scientific and technological progress and information age, various electric class equipment are giving people's daily life band
While to facilitate, the electromagnetic radiation supervened also inevitably becomes new pollution, and day is endangered caused by environment
It is beneficial serious.For it is invisible touch less than electromagnetic radiation pollution, the research to electromagnetic shielding material, this kind of material have been unfolded both at home and abroad
Material can be divided into metal and composite material two major classes.Wherein, though composite material has preferable electro-magnetic screen function, obdurability is general
All over deficiency, it is unable to reach the mechanical property standard of practical application；Metal material such as gold, silver, copper etc. because high production cost, quality compared with
Weight does not meet lightweight and the human-oriented social demand of price.It was gratifying that green novel energy source of the magnesium alloy as 21 century
Material and most light structural metallic materials have been found to possess preferable electromagnetic shielding performance, in electronic component using upper table
Reveal good development potentiality and superiority of effectiveness.
But magnesium alloy such as Mg-Al, Mg-Zn-Zr, Mg-Cu, the Mg-Sn etc. for being applied to electromagnetic shielding aspect at present are to close
There is the shortcomings that obdurability is insufficient or electromagnetic shielding performance still needs to promotion in gold.Wherein, though Mg-Al and Mg-Zn-Zr alloy prolongs
Malleability is preferable, but Mg-Al alloy strength is extremely low, Mg-Zn-Zr alloy electromagnetic shielding properties is insufficient；Though Mg-Cu alloy intensity
Height, electromagnetic shielding performance are excellent, but its toughness is usually poor；Mg-Sn alloy because the precipitated phase that ageing strengthening generates is unstable,
Obdurability and electromagnetic shielding performance can not also get both.As it can be seen that needing to propose synchronous improvement magnesium alloy obdurability and electromagnetic wave shielding
The new method of energy meets the great demand currently for high tough lightweight electronic component, smoothly meets and adapt to 5G information
Hope of the epoch for electromagnetic shielding application.
Summary of the invention
The object of the present invention is to provide the magnesium alloy and its deformation heat treatment method of a kind of high tough high electromagnetic shielding performance,
And technological design is reasonable, equipment requirement is simple and convenient to operate, is at low cost, is high-efficient, can prepare containing the microcosmic knot of honeycomb
Structure, the magnesium alloy for being provided simultaneously with high-strength tenacity and high electromagnetic wave shielding.
Element contained by magnesium alloy of the present invention and its mass percent are as follows: Gd:3~16%, Ca:0.2~1%, Zn:0.02~
0.2%, remaining is Mg, and mass percent value >=3 of Ca and Zn；It or is Gd:3~16%, Ca:0.2~1%, Al:0.2
~3%, remaining is Mg, and mass percent value >=0.2 of Ca and Al.
Further, element and its mass percent contained by magnesium alloy are as follows: Gd:3~13%, Ca:0.2~0.8%, Zn:
0.02~0.1%, remaining is Mg, and mass percent value >=4 of Ca and Zn.
Further, element and its mass percent contained by magnesium alloy are as follows: Gd:3~13%, Ca:0.2~0.8%, Al:0.2
~2%, remaining is Mg, and mass percent value >=0.3 of Ca and Al.
The magnesium alloy deformation heat treatment method of the tough high electromagnetic shielding performance of height provided by the invention, steps are as follows:
A. element and its mass percent contained by magnesium alloy are as follows: Gd:3~16%, Ca:0.2~1%, Zn:0.02~
0.2%, remaining is Mg, and mass percent value >=3 of Ca and Zn；It or is Gd:3~16%, Ca:0.2~1%, Al:0.2
~3%, remaining is Mg, and mass percent value >=0.2 of Ca and Al；
B. semi-continuous casting method prepares magnesium alloy ingot blank, hot rolling or is hot extruded into the plate of 5~25mm thickness and through being dissolved
After processing, in 200~260 DEG C of ageing treatments for carrying out 1~72h, water quenchings；
C. the low-temperature deformation for being 0.02~0.1 to 100 DEG C of progress true strain in room temperature by the plate after ageing treatment, then
The ageing treatment of 150~220 DEG C of 0.5~48h of progress, water quenching, gained magnesium alloy inside precipitated phase containing cylinder, cylinder dislocation and base
The honeycomb microstructure that face precipitated phase, basal plane dislocation collectively form.
Aging temp described in the step B is 200~250 DEG C, and aging time is 5~72h.
Low-temperature deformation temperature described in the step C is room temperature to 80 DEG C, and aging temp is 160~220 DEG C, when timeliness
Between be 2~48h.
Aging temp described in the step C is 20~50 DEG C lower than aging temp described in step B.
A kind of magnesium alloy deformation heat treatment method of high tough high electromagnetic shielding performance provided by the invention has following several big
Advantage:
1. high-conductive metal element of the present invention without adding the valuableness such as Au, Ag, Cu, is also not required to the originals such as addition Sr, Zr, Sn
The heavier alloy element of protonatomic mass, it is at low cost, income is big, meet the lightweight of Current electronic component and price is popular wants
It asks.
2. the present invention can be precipitated in 200~260 DEG C of ag(e)ing processes along Mg matrix cylinder big by addition rare earth Gd
The MgGd Binary-phase of amount, obtains apparent ageing strengthening；Then, during low-temperature deformation, a large amount of Prismatic slips can be induced, into
One step Strengthening and Toughening magnesium alloy, on the contrary, common ageing strengthening magnesium alloy is difficult to generate Prismatic slip.
3. the present invention can generate small size along Mg matrix basal plane in 150~220 DEG C of ag(e)ing processes by addition Ca element
Spherical MgCa Binary-phase, electromagnetic wave is significantly increased in the reflection surface density of Mg matrix basal plane, promotes electromagnetic shielding performance；Pass through
Zn or Al element is added, the MgCaZn ternary phase being equally precipitated along Mg matrix basal plane or complex-shaped AlCa binary can be formed
Phase increases the purity of Mg matrix, further weakens electromagnetic intensity.
4. the present invention can be closed by Mg-Gd-Ca-Zn the or Mg-Gd-Ca-Al alloy of low temperature deformation heat treatment preparation in magnesium
The honeycomb microstructure that golden internal generation is collectively constituted by cylinder precipitated phase, cylinder dislocation and basal plane precipitated phase, basal plane dislocation,
Not only reflecting surface of the electromagnetic wave inside magnesium alloy had been increased, but also has produced apparent ageing strengthening, reached magnesium alloy while having
The purpose of standby high-strength tenacity and high electromagnetic wave shielding, and equipment requirement is simple and convenient to operate, production cost is low, high-efficient.
5. Mg-Gd-Ca-Zn or Mg-Gd-Ca-Al system prepared by the present invention alloy, yield strength >=200MPa, tension are strong
Degree >=240MPa, elongation percentage >=10% can respectively reach 90dB and 80dB in the electromagnet shield effect of 800MHz and 1200MHz,
Compared to alloys such as low obdurability Mg-Al, Mg-Zn-Zr, Mg-Cu, the Mg-Sn for being applied to electromagnetic shielding at present, the present invention is to mechanics
Synchronous improvement is significant with electromagnetic shielding performance for performance, can effectively break through current magnesium alloy high-strength tenacity and high electromagnetic shielding
The technical bottleneck that property can not get both.
Specific embodiment
It is intended to further illustrate the present invention with reference to embodiments, is not intended to limit the present invention.
Embodiment 1
Raw material are Mg-3Gd-0.6Ca-0.2Zn alloy (mass percent), and Ca/Zn mass ratio is 3, and use is semicontinuous
Casting and hot rolling obtain the plate with a thickness of 10mm thickness, after solution treatment, ageing treatment, water quenchings in 230 DEG C of progress 72h,
Then, the deformation that true strain is 0.03 is carried out at 80 DEG C, then in 190 DEG C of ageing treatments for carrying out 48h, water quenchings.To the alloy into
Row room-temperature mechanical property and electromagnetic shielding performance test, the results are shown in Table 1.
Embodiment 2
Raw material are Mg-6Gd-0.8Ca-0.1Zn alloy (mass percent), and Ca/Zn mass ratio is 8, and use is semicontinuous
Casting and hot extrusion obtain the plate with a thickness of 20mm thickness, after solution treatment, in 260 DEG C of ageing treatments for carrying out 60h, water
It quenches, then, the deformation that true strain are 0.07 is carried out at 60 DEG C, then carry out ageing treatment for 24 hours, water quenching at 220 DEG C.To the alloy
Room-temperature mechanical property and electromagnetic shielding performance test are carried out, the results are shown in Table 1.
Embodiment 3
Raw material are Mg-16Gd-0.2Ca-0.02Zn alloy (mass percent), and Ca/Zn mass ratio is 10, using partly connecting
Continuous casting and hot rolling obtain the plate with a thickness of 25mm thickness, after solution treatment, ageing treatment, water quenchings in 200 DEG C of progress 2h,
Then, the deformation that true strain is 0.1 is carried out in room temperature, then in 150 DEG C of ageing treatments for carrying out 1h, water quenchings.The alloy is carried out
Room-temperature mechanical property and electromagnetic shielding performance test, the results are shown in Table 1.
Embodiment 4
Raw material are Mg-7Gd-1Ca-3Al alloy (mass percent), and Ca/Al mass ratio is 0.33, using semicontinuous casting
The plate with hot rolling acquisition with a thickness of 5mm thickness is made, after solution treatment, ageing treatment, water quenchings in 230 DEG C of progress 48h, with
Afterwards, the deformation that true strain is 0.05 is carried out at 100 DEG C, then in 210 DEG C of ageing treatments for carrying out 0.5h, water quenchings.To the alloy into
Row room-temperature mechanical property and electromagnetic shielding performance test, the results are shown in Table 1.
Embodiment 5
Raw material are Mg-11Gd-0.4Ca-2Al alloy (mass percent), and Ca/Al mass ratio is 0.2, and use is semicontinuous
Casting and hot rolling obtain the plate with a thickness of 7mm thickness, after solution treatment, ageing treatment, water quenchings in 220 DEG C of progress 12h, with
Afterwards, the deformation that true strain is 0.02 is carried out at 50 DEG C, then in 170 DEG C of ageing treatments for carrying out 6h, water quenchings.Room is carried out to the alloy
Warm mechanical property and electromagnetic shielding performance test, the results are shown in Table 1.
Embodiment 6
Raw material are Mg-10Gd-0.8Ca-0.2Al alloy (mass percent), and Ca/Al mass ratio is 4, and use is semicontinuous
Casting and hot extrusion obtain the plate with a thickness of 15mm thickness, after solution treatment, ageing treatment, water quenchings in 210 DEG C of progress 8h,
Then, the deformation that true strain is 0.09 is carried out in room temperature, then in 160 DEG C of ageing treatments for carrying out 2h, water quenchings.The alloy is carried out
Room-temperature mechanical property and electromagnetic shielding performance test, the results are shown in Table 1.
Table 1
As shown in Table 1, it is applied to Mg-Al, Mg-Zn-Zr, Mg-Cu, Mg-Sn system alloy of electromagnetic shielding, Wu Fajian at present
Having obdurability and electromagnet shield effect, wherein Mg-Al alloy yield strength and tensile strength only have 81MPa and 170MPa respectively,
For Mg-Zn-Zr alloy when wave frequency is 800MHz and 1200MHz, shield effectiveness only has 77dB and 65dB, Mg-Cu respectively
The elongation percentage of alloy only has the obdurability of 4.2%, Mg-Sn alloy and shield effectiveness also lower.On the contrary, the embodiment of the present invention
Gained Mg-Gd-Ca-Zn and Mg-Gd-Ca-Al system alloy is provided simultaneously with excellent mechanical property and electromagnetic shielding performance, and surrender is strong
Significant synchronous improvement is obtained on degree, tensile strength, elongation percentage and electromagnet shield effect, can meet daily life, national defence troops
The requirement to electronic component obdurability and electromagnetic wave shielding such as work, medical facilities.
Claims (7)
1. a kind of magnesium alloy of high tough high electromagnetic shielding performance, it is characterised in that: element contained by magnesium alloy and its quality percentage
Number are as follows: Gd:3~16%, Ca:0.2~1%, Zn:0.02~0.2%, remaining is Mg, and the mass percent value of Ca and Zn >=
3；Or be Gd:3~16%, Ca:0.2~1%, Al:0.2~3%, remaining is Mg, and the mass percent value of Ca and Al >=
0.2。
2. the magnesium alloy of high tough high electromagnetic shielding performance as described in claim 1, it is characterised in that: element contained by magnesium alloy
And its mass percent are as follows: Gd:3~13%, Ca:0.2~0.8%, Zn:0.02~0.1%, remaining is Mg, and Ca and Zn
Mass percent value >=4.
3. the magnesium alloy of high tough high electromagnetic shielding performance as described in claim 1, it is characterised in that: element contained by magnesium alloy
And its mass percent are as follows: Gd:3~13%, Ca:0.2~0.8%, Al:0.2~2%, remaining is Mg, and the quality of Ca and Al
Percent value >=0.3.
4. a kind of thermomechanical treatment of the magnesium alloy of the tough high electromagnetic shielding performance of height as claimed in any one of claims 1-3
Method, it is characterised in that the following steps are included:
A. raw material are prepared by alloying component requirement；
B. semi-continuous casting method prepares magnesium alloy ingot blank, hot rolling or is hot extruded into the plate of 5~25mm thickness and through solution treatment
Afterwards, in 200~260 DEG C of ageing treatments for carrying out 1~72h, water quenchings；
C. the low-temperature deformation for being 0.02~0.1 to 100 DEG C of progress true strain in room temperature by the plate after ageing treatment, then 150
The ageing treatment of~220 DEG C of 0.5~48h of progress, water quenching, gained magnesium alloy inside precipitated phase containing cylinder, cylinder dislocation and basal plane
The honeycomb microstructure that precipitated phase, basal plane dislocation collectively form.
5. a kind of magnesium alloy deformation heat treatment method of high tough high electromagnetic shielding performance according to claim 4, special
Sign is: aging temp described in step B is 200~250 DEG C, and aging time is 5~72h.
6. a kind of magnesium alloy deformation heat treatment method of high tough high electromagnetic shielding performance according to claim 4 or 5,
Be characterized in that: low-temperature deformation temperature described in step C is room temperature to 80 DEG C, and aging temp is 160~220 DEG C, aging time 2
~48h.
7. a kind of magnesium alloy deformation heat treatment method of high tough high electromagnetic shielding performance according to claim 6, special
Sign is: aging temp described in step C is 20~50 DEG C lower than aging temp described in step B.
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Cited By (3)
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| CN112951338A (en) * | 2021-03-05 | 2021-06-11 | 沈阳大学 | Method for designing high-elasticity-modulus binary magnesium alloy precipitated phase |
| CN113416873A (en) * | 2021-06-28 | 2021-09-21 | 晋中学院 | Rare earth magnesium alloy plate with high electromagnetic shielding effect and preparation method thereof |
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| CN113416873A (en) * | 2021-06-28 | 2021-09-21 | 晋中学院 | Rare earth magnesium alloy plate with high electromagnetic shielding effect and preparation method thereof |
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