CN109402540A - A method of eliminating particle enhances AZ91D magnesium-based composite material dislocation - Google Patents
A method of eliminating particle enhances AZ91D magnesium-based composite material dislocation Download PDFInfo
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- CN109402540A CN109402540A CN201811514097.2A CN201811514097A CN109402540A CN 109402540 A CN109402540 A CN 109402540A CN 201811514097 A CN201811514097 A CN 201811514097A CN 109402540 A CN109402540 A CN 109402540A
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- composite material
- based composite
- stirring
- rolling
- az91d magnesium
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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
Abstract
The invention discloses a kind of methods of elimination particle enhancing AZ91D magnesium-based composite material dislocation, belong to magnesium-based composite material technical field of modification.It is characterized by: passing through conjunctive use rolling and agitating friction Combined machining, the size shape of particle enhancing AZ91D magnesium-based composite material reinforcement is set to change and redistribute, AZ91D magnesium-based composite material matrix grain recrystallizes, distortion of lattice is reduced, it realizes the purpose for eliminating particle enhancing AZ91D magnesium-based composite material dislocation, and further increases the comprehensive performance of AZ91D magnesium-based composite material.
Description
Technical field
The present invention relates to AZ91D magnesium-based composite materials, belong to technical field of material modification, and in particular to a kind of elimination particle increasing
The method of strong AZ91D magnesium-based composite material dislocation.
Background technique
AZ91D magnesium-based composite material specific strength with higher, specific stiffness, while also there is preferable wearability, resistance to height
Warm, lower thermal expansion coefficient and damping performance.In addition, AZ91D magnesium-based composite material also has good damping capacity and electricity
Magnetic shield performance is good functional material.Particle enhances low AZ91D magnesium-based composite material preparation cost, simple process and tool
Standby isotropism is the AZ91D magnesium-based composite material of most possible realization low-coat scale commodity production at present.Therefore,
Grain enhancing AZ91D magnesium-based composite material has sizable application prospect in the industry such as electronics, aerospace, automobile.But
Due to the presence of dislocation, causes material that distortion of lattice occurs, cause toughness of material low, brittleness is big, and processing performance is low.Research hair
Existing, microstructure modification technology can eliminate particle enhancing AZ91D magnesium-based composite material dislocation, and improving particle enhances AZ91D magnesium-based
The comprehensive performance of composite material.Therefore, the material modification method for eliminating particle enhancing AZ91D magnesium-based composite material dislocation is ground
Study carefully personnel's concern.
It is retrieved through applicant, the research about AZ91D magnesium-based composite material dislocation is mainly around dislocation motion, dislocation at present
Proliferation, dislocation strengthening etc., Hong Chengmiao have studied the movement of particle enhancing AZ91D magnesium-based composite material dislocation, proliferation, Nan Hong
Proliferation, the entanglement etc. for having studied particle enhancing AZ91D magnesium-based composite material dislocation by force, do not find so far by eliminating particle
Enhancing AZ91D magnesium-based composite material dislocation improves the patent of its comprehensive performance.
Summary of the invention
Goal of the invention: to overcome the shortcomings of the above technology, it is an object of that present invention to provide improve particle to enhance AZ91D magnesium-based
The technical method of composite material combination property is especially to provide a kind of elimination particle enhancing AZ91D magnesium-based composite material dislocation
Method.
Technical solution: to realize that above-mentioned technical characteristic, elimination particle proposed by the present invention enhance AZ91D magnesium-based composite material
The method of dislocation the following steps are included:
(1) block particle enhancing AZ91D magnesium-based composite material ingot casting is subjected to rolling process, be prepared into certain thickness
AZ91D magnesium-based composite material plate；
(2) the particle enhancing AZ91D magnesium-based composite material after rolling is stirred friction working process.
After completion of processing, TEM microexamination and XRD characterization test are carried out, the results showed that number of dislocations is a large amount of with density
It reduces and even disappears, it is wear-resisting to be improved with comprehensive performances such as intensity.
Wherein, the enhancing grain volume fraction of the particle enhancing AZ91D magnesium-based composite material is 5vol.%-
10vol.%.If enhancing grain volume fraction it is excessively high, material too stiff plastic is poor, cause stirring-head can fracture failure, and
The too low material of grain content is too soft, and material can be stirred head and blend.
Preferably, the technological parameter of rolling process are as follows: 420-450 DEG C of rolling temperature；Rolling thickness is to 4-6mm.
It is highly preferred that in rolling, by multi- pass rolling, volume under pressure 0.5-0.6mm per pass.
Preferably, mixing yoghurt processing is carried out after rolling, mixing yoghurt technological parameter position: stirring-head revolving speed:
1200-1500r/min；Stirring-head process velocity: 80-120mm/min；The shoulder breadth diameter of stirring-head: 10~15mm；Stir scalp acupuncture
It is long: 3~3.5mm；Mixing needle diameter: 3~5mm；Test volume under pressure are as follows: 2~2.5mm；Stirring-head with it is vertical aspect inclination angle be
3.0~5.0 degree；The stirring of single side multi-pass；Overlapping rate 20~30%.
It is highly preferred that the shoulder breadth diameter of stirring-head: 15mm；It is long to stir scalp acupuncture: 3.5mm；Mixing needle diameter: 5mm；Under test
Pressure amount are as follows: 2.5mm；Stirring-head is 3.0 degree with the inclination angle of vertical aspect；The stirring of single side multi-pass；Overlapping rate 30%.
Present invention focuses on rolling to stir to combine dislocation, single roll cannot achieve dislocation with single stirring.Particularly, lead to
The repeat region and control overlapping rate for crossing control stirring, achieve the purpose that eliminate dislocation.
In one preferred embodiment, technical solution of the present invention is achieved by the steps of:
(1) block particle enhancing AZ91D magnesium-based composite material ingot casting is rolled, is prepared into certain thickness AZ91D
Magnesium-based composite material plate；Rolling process technological parameter: 420-450 DEG C of rolling temperature；Rolling thickness is to 4-6mm；By multi-pass
It rolls, per pass volume under pressure 0.5-0.6mm.
(2) the particle enhancing AZ91D magnesium-based composite material after rolling is stirred friction working process；Agitating friction adds
Work technological parameter: stirring-head revolving speed: 1200-1500r/min；Stirring-head process velocity: 80-120mm/min；The shoulder breadth of stirring-head
Diameter: 15mm；It is long to stir scalp acupuncture: 3.5mm；Mixing needle diameter: 5mm；Test volume under pressure are as follows: 2.5mm；Stirring-head with it is vertical aspect
Inclination angle be 3.0 degree；The stirring of single side multi-pass；Overlapping rate 30%.
(3) completion of processing, carries out TEM microexamination and XRD characterization test, and number of dislocations largely reduces or even disappears with density
It loses, it is wear-resisting to be improved with comprehensive performances such as intensity.
It is compound largely to eliminate AZ91D magnesium-based by the way that rolling and mixing yoghurt technique is used in combination for the method for the present invention
The dislocation of material, through TEM and the XRD characterization testing inspection analysis dislocation density ρ order of magnitude by 1014Drop to 103, number of dislocations is big
Width decline, furthermore this method refines AZ91D magnesium-based composite material matrix crystal grain, improves the microstructure of enhancing particle, compared with
The comprehensive performance of particle enhancing AZ91D magnesium-based composite material is improved well.The characteristics of the method for the present invention, is: after processing
AZ91D magnesium-based composite material dislocation substantially eliminates, and carries out tensile test at room temperature, tensile strength, elongation percentage etc. significantly improve.
Present device is simple and convenient to operate, success rate is high, low in cost, practical, is a kind of novel, efficient, practical particle
Enhance AZ91D magnesium-based composite material dislocation and eliminates technique.
Specific embodiment
Embodiment 1:
The outer adding type volume fraction of working process is 8vol.%SiC/AZ91 composite material, specific implementation method:
(1) outer adding type 8vol.%SiC/AZ91 composite material slab 1000g is taken, 4mm thickness is rolled to using hot rolling process
Degree, 420 DEG C of rolling temperature, by multi- pass rolling, volume under pressure 0.5mm per pass.
(2) material after rolling is cut into having a size of 200mm × 50mm × 4mm, in order to clamping, agitating friction rotary needle
Go deep into general 3.5mm of Workpiece length or so；
(3) specimen clamping is fixed, is stirred friction working process, technological parameter is: stirring-head revolving speed: 1200r/
min；Stirring-head process velocity: 100mm/min；The shoulder breadth diameter of stirring-head: 15mm；It is long to stir scalp acupuncture: 3.5mm；Mixing needle is straight
Diameter: 5mm；Test volume under pressure are as follows: 2.5mm；Stirring-head is 3.0 degree with the inclination angle of vertical aspect；The stirring of single side multi-pass；Overlapping rate
30%.
(4) after stirring friction treatment, with the dislocation of tem observation and XRD characterization experimental observation material internal, through TEM and XRD
The testing inspection analysis dislocation density ρ order of magnitude is characterized by 1014Drop to 103, residual stress declines to a great extent, and carries out room temperature tensile
It is tested with hardness test.The experimental results showed that even disappearance is greatly decreased in composite inner dislocation after the method for the present invention,
Tensile strength has been increased to 4.2%, elongation percentage and has been increased to 15.2%, and hardness reduces 0.5%.
Embodiment 2:
Working process original position volume fraction is 6vol.%ZrB2/ AZ91 composite material, specific implementation method:
(1) 5vol.%ZrB in situ is taken2/ AZ61 composite material slab 1000g, is rolled to 5mm thickness using hot rolling process,
440 DEG C of rolling temperature, by multi- pass rolling, volume under pressure 0.6mm per pass.
(2) material after rolling is cut into having a size of 150mm × 50mm × 5mm；
(3) specimen clamping is fixed, is stirred friction working process, technological parameter is: stirring-head revolving speed: 1400r/
min；Stirring-head process velocity: 80mm/min；The shoulder breadth diameter of stirring-head: 15mm；It is long to stir scalp acupuncture: 3.5mm；Mixing needle is straight
Diameter: 5mm；Test volume under pressure are as follows: 2.5mm；Stirring-head is 3.0 degree with the inclination angle of vertical aspect；The stirring of single side multi-pass；Overlapping rate
30%.
(4) after agitating friction, with the dislocation of tem observation and XRD characterization experimental observation material internal, through TEM and XRD characterization
Testing inspection analyzes the dislocation density ρ order of magnitude by 1015Drop to 102, and carry out room temperature tensile and hardness test experiment.As a result table
Bright, composite inner dislocation, which is reduced, after the method for the present invention even disappears, and tensile strength has been increased to 5.1%, elongation percentage
It is increased to 16.3%, hardness reduces 0.3%.
Embodiment 3:
Working process original position volume fraction be 10vol.%AlN/AZ91 composite material, specific implementation method:
(1) 10vol.%AlN/AZ63 composite material slab 1000g in situ is taken, 6mm thickness is rolled to using hot rolling process,
450 DEG C of rolling temperature, by multi- pass rolling, volume under pressure 0.5mm per pass.
(2) material after rolling is cut into having a size of 150mm × 50mm × 6mm
(3) specimen clamping is fixed, is stirred friction working process, technological parameter is: stirring-head revolving speed: 1200r/
min；Stirring-head process velocity: 80mm/min；The shoulder breadth diameter of stirring-head: 15mm；It is long to stir scalp acupuncture: 3.5mm；Mixing needle is straight
Diameter: 5mm；Test volume under pressure are as follows: 2.5mm；Stirring-head is 3.0 degree with the inclination angle of vertical aspect；The stirring of single side multi-pass；Overlapping rate
30%.
(4) after stirring friction treatment, with the dislocation of tem observation and XRD characterization experimental observation material internal, through TEM and XRD
The testing inspection analysis dislocation density ρ order of magnitude is characterized by 1014Drop to 102, residual stress declines to a great extent, and carries out room temperature tensile
It is tested with hardness test.The experimental results showed that even disappearance is greatly decreased in composite inner dislocation after the method for the present invention,
Tensile strength has been increased to 5.9%, elongation percentage and has been increased to 17.1%, and hardness reduces 0.4%.
In conclusion the method for the present invention passes through conjunctive use rolling and mixing yoghurt technology (Friction Stir
Processing, abbreviation FSP) it is combined processing, material is rolled first, the microstructure of material changes, and obtains
To a large amount of texture, it is then stirred friction treatment, generates frictional heat using high-speed rotating stirring-head and material interaction
Make material softening, the rotation and traveling of stirring-head make material part region dynamic recovery and recrystallization, lead to the microcosmic of material
Institutional framework changes again.It is handled by two different material modification technical tie-ups, material matrix and enhancing body tissue
Shape size changes, and is distributed dense uniform, and distortion of lattice is reduced, and dislocation is eliminated.The technology of the present invention is mainly characterized by using rolling
System and the united combination process of mixing yoghurt, to more thoroughly eliminate the position of particle enhancing AZ91D magnesium-based composite material
Mistake improves its comprehensive performance.Present invention process is simple and convenient to operate, success rate is high, low in cost, practical, is a kind of new
Type, efficient, practical AZ91D magnesium-based composite material dislocation eliminate technique.
Claims (6)
1. it is a kind of eliminate particle enhancing AZ91D magnesium-based composite material dislocation method, characterization method the following steps are included:
(1) block particle enhancing AZ91D magnesium-based composite material ingot casting is subjected to rolling process, is prepared into certain thickness AZ91D
Magnesium-based composite material plate；
(2) the particle enhancing AZ91D magnesium-based composite material after rolling is stirred friction working process.
2. the method according to claim 1, wherein the enhancing of particle enhancing AZ91D magnesium-based composite material
Grain volume fraction is 5vol.%-10vol.%.
3. the method according to claim 1, wherein the technological parameter of rolling process are as follows: rolling temperature 420-450
℃；Rolling thickness is to 4-6mm.
4. according to the method described in claim 3, it is characterized in that, in rolling, by multi- pass rolling, volume under pressure per pass
0.5-0.6mm。
5. the method according to claim 1, wherein carrying out mixing yoghurt processing, agitating friction after rolling
Working process parameter position: stirring-head revolving speed: 1200-1500r/min；Stirring-head process velocity: 80-120mm/min；Stirring-head
Shoulder breadth diameter: 10~15mm；It is long to stir scalp acupuncture: 3~3.5mm；Mixing needle diameter: 3~5mm；Test volume under pressure are as follows: 2~
2.5mm；Stirring-head is 3.0~5.0 degree with the inclination angle of vertical aspect；The stirring of single side multi-pass；Overlapping rate 20~30%.
6. according to the method described in claim 5, it is characterized in that, the shoulder breadth diameter of stirring-head: 15mm；It is long to stir scalp acupuncture:
3.5mm；Mixing needle diameter: 5mm；Test volume under pressure are as follows: 2.5mm；Stirring-head is 3.0 degree with the inclination angle of vertical aspect；Single side is more
Passage stirring；Overlapping rate 30%.
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Citations (8)
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|---|---|---|---|---|
| JP2002205177A (en) * | 2000-12-28 | 2002-07-23 | Showa Denko Kk | Friction stir welding method |
| CN101760710A (en) * | 2008-12-24 | 2010-06-30 | 中国科学院金属研究所 | Preparation method of fine crystalline superplastic heat-resistance magnesium alloy |
| CN102528271A (en) * | 2012-01-20 | 2012-07-04 | 重庆大学 | Method for improving mechanical property of FSW (friction stir welding) magnesium alloy joint |
| JP2012143811A (en) * | 2010-12-24 | 2012-08-02 | Sumitomo Electric Ind Ltd | Magnesium alloy material |
| CN103668013A (en) * | 2013-11-12 | 2014-03-26 | 江苏大学 | Method for super-plastic pretreatment of in situ aluminum base composite material |
| JP2015057292A (en) * | 2013-08-09 | 2015-03-26 | 国立大学法人大阪大学 | Friction agitation joint method of metal |
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| CN106736269A (en) * | 2016-12-01 | 2017-05-31 | 中国科学院金属研究所 | A kind of preparation method of circular aluminum matrix composite silk material |
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2018
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002205177A (en) * | 2000-12-28 | 2002-07-23 | Showa Denko Kk | Friction stir welding method |
| CN101760710A (en) * | 2008-12-24 | 2010-06-30 | 中国科学院金属研究所 | Preparation method of fine crystalline superplastic heat-resistance magnesium alloy |
| JP2012143811A (en) * | 2010-12-24 | 2012-08-02 | Sumitomo Electric Ind Ltd | Magnesium alloy material |
| CN102528271A (en) * | 2012-01-20 | 2012-07-04 | 重庆大学 | Method for improving mechanical property of FSW (friction stir welding) magnesium alloy joint |
| JP2015057292A (en) * | 2013-08-09 | 2015-03-26 | 国立大学法人大阪大学 | Friction agitation joint method of metal |
| CN103668013A (en) * | 2013-11-12 | 2014-03-26 | 江苏大学 | Method for super-plastic pretreatment of in situ aluminum base composite material |
| CN105463353A (en) * | 2015-11-23 | 2016-04-06 | 哈尔滨工业大学 | Method for manufacturing fine-grain magnesium alloy block through friction stir treatment |
| CN106736269A (en) * | 2016-12-01 | 2017-05-31 | 中国科学院金属研究所 | A kind of preparation method of circular aluminum matrix composite silk material |
Non-Patent Citations (2)
| Title |
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| B.N. SAHOOA ET AL.: "Microstructural modification and its effect on strengthening mechanism and yield asymmetry of in-situ TiC-TiB2/ AZ91 magnesium matrix", 《MATERIALS SCIENCE & ENGINEERING A》 * |
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Application publication date: 20190301 |
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