CN108480641A - A kind of method that metal powder block prepares super fine crystal material - Google Patents
A kind of method that metal powder block prepares super fine crystal material Download PDFInfo
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- CN108480641A CN108480641A CN201810194925.2A CN201810194925A CN108480641A CN 108480641 A CN108480641 A CN 108480641A CN 201810194925 A CN201810194925 A CN 201810194925A CN 108480641 A CN108480641 A CN 108480641A
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- crystal material
- metal
- fine crystal
- super fine
- metal capsule
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/1208—Containers or coating used therefor
- B22F3/1258—Container manufacturing
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses the method that the metal powder block of a kind of intensity that super fine crystal material can be substantially improved and toughness prepares super fine crystal material, step includes：1) pure aluminium powder particle is encapsulated in metal capsule, then, the metal capsule equipped with pure aluminium powder particle is placed on gasket and is put into heating furnace, the temperature of heating controls between 95~105 DEG C, keeps the temperature more than half an hour；2) ECAP molds are heated to temperature identical with metal capsule；3) material in metal capsule is put into ECAP molds and squeezes the extruding that path carries out four passages according to Bc.Super fine crystal material made from the method for super fine crystal material is prepared using metal powder block of the present invention to be widely used in many fields already.
Description
Technical field
The invention belongs to powder metallurgy and powder forming technology, more particularly to a kind of metal powder block prepares Ultra-fine Grained
The method of material.
Background technology
Dusty material has been widely used in many fields of industry as the important component of material.Powder metallurgy
Material is an important component in materials science field, and powder metallurgy is with metal powder (including alloy powder) or gold
The mixture for belonging to powder and non-metal powder is raw material, and one kind of metal material, composite material and its product is produced by solidification
Technology.In recent years, with the continuous development of powder-making technique and metallurgical technology so that the advantage of powder metallurgy is given full play to.
Therefore, facing to modern industry rapid development and science and technology be constantly progressive, powder metallurgy solidification after material automobile,
It is widely used in the industry such as aviation.
The continuous development of industry and technology needs to produce various plates, band, web or pipe, rodlike using powder metallurgy process
And other shapes proximate matter, and more stringent requirements are proposed to material property and product size and shape.Pass through powder metallurgy work
Skill means can make dusty material be cured as the product of definite shape, size and performance, however, due to passing through powder metallurgical technique
Production process is complex, and can have certain hole inside the product obtained.For other dense materials, product
Plastic deformation ability it is weaker, and destruction is also easy to produce in following process deformation process, it is difficult to accumulation generates big effective strain,
To influence grain refining effect, its intensity and toughness is made to substantially reduce, affect the mechanical property of material, to influence material
Performance.
Invention content
The technical problem to be solved by the present invention is to：A kind of intensity that super fine crystal material is substantially improved and toughness are provided
The method that metal powder block prepares super fine crystal material.
In order to solve the above technical problems, the technical solution adopted by the present invention is：A kind of metal powder blockization prepares ultra-fine
The method of brilliant material, step include：
1) pure aluminium powder particle is encapsulated in metal capsule, then, the metal capsule equipped with pure aluminium powder particle is set
In being put into heating furnace on gasket, the temperature of heating controls between 95~105 DEG C, keeps the temperature more than half an hour；
2) ECAP molds are heated to temperature identical with metal capsule；
3) material in metal capsule is put into ECAP molds and squeezes the extruding that path carries out four passages according to Bc.
As a preferred embodiment, in a kind of metal powder block prepares the method for super fine crystal material, institute
The manufacturing process for the metal capsule stated is：It is big that fine aluminium ingot is cut into the required size of metal capsule with wire electric discharge
It is small, it is used in combination drilling machine to drill through a diameter of 80 millimeters of hole.
It as a preferred embodiment, will in a kind of metal powder block prepares the method for super fine crystal material
The specimen surface of metal capsule polishes smooth smooth, the specimen surface and ECAP of metal capsule in reduction equal channel angular pressing
Friction between the die wall of (Equal Channel Angular Pressing, abbreviation ECAP) mold.
As a preferred embodiment, in a kind of metal powder block prepares the method for super fine crystal material, institute
The thickness control of gasket is stated between 4.5~5.5 millimeters.
The Bc of the ECAP molds squeeze medial angle Φ=120 ± 2 ° of the corner in path, lateral angle Ψ=25 ±
0.5°。
As a preferred embodiment, in a kind of metal powder block prepares the method for super fine crystal material, institute
The extrusion speed stated controls between 0.95~1.05 mm/second.
The beneficial effects of the invention are as follows：The method that metal powder block of the present invention prepares super fine crystal material can be with
At a lower temperature, while making pure aluminium powder material that homogeneous deformation occur, internal void is obtained effectively shrinking and is closed, this
Fine aluminium particle is effectively directly solidified into the block materials of high-compactness by sample, is not required to the sintering circuit after being formed, and
Reach good mechanical property.
Description of the drawings
Fig. 1 is the stereoscopic schematic diagram of ECAP molds.
Fig. 2 is ECAP extrusion process schematic diagrames.
Fig. 3 is cross section X, the flow surface Y and longitudinal section Z schematic diagrames of sample.
Fig. 4 is that the paths Bc squeeze sample TEM organization charts after the first passage
Fig. 5 is that the paths Bc squeeze sample TEM organization charts after the second passage
Fig. 6 is that the paths Bc squeeze sample TEM organization charts after four-pass.
Specific implementation mode
Below in conjunction with the accompanying drawings, it is described in detail by taking the pure aluminium powder particle of 40 microns of original dimension as an example of the present invention
A kind of metal powder block prepare super fine crystal material method specific embodiment：
The method that a kind of metal powder block of the present invention prepares super fine crystal material, step include：
1) metal capsule is made first, and process is：Fine aluminium ingot is cut into needed for metal capsule with wire electric discharge
The size wanted is used in combination drilling machine to drill through a diameter of 80 millimeters of hole, the deformation distribution due to Main Deformation and uneven, bottom
Portion's region deformation amount is relatively small, therefore appropriate there are surpluses, it is ensured that the uniformity of deformation；Use 240# sand paper will be every again
The surface of a jacket sample is polished, and keeps its smooth, to reduce the friction in equal channel angular pressing between sample and die wall；
Then, the pure aluminium powder particle of 40 microns of original dimension is encapsulated in metal capsule, passes through outer force effect
Powder in jacket is set to generate an initial degree of packing, sample consistency is about 80% at this time, and pure aluminium powder particle will be then housed
Metal capsule be placed in thickness and be put into heating in heating furnace on the gasket between 4.5~5.5 millimeters (preferably 5 millimeters), add
The temperature of heat controls between 95~105 DEG C, keeps the temperature more than half an hour；
2) ECAP molds shown in FIG. 1 are heated to temperature identical with metal capsule, the Bc of ECAP molds squeezes path
Medial angle Φ=120 ± 2 ° (preferably 120 °) of corner, lateral angle Ψ=25 ± 0.5 ° (preferably 25 °)；
3) material in metal capsule is put into ECAP molds, it is in for the four column Universal hydraulics of y32-100-1 to use type
Machine squeezes the extruding that path carries out four passages according to Bc -- and shown in Figure 2, extrusion speed control is in 0.95~1.05 milli
Between meter per second.By with pure aluminium powder do not squeeze before compared with, it can be seen that hole is largely closed, between powder particle compared with
Good is consolidated, and interface is relatively complete, and consistency significantly improves, and specimen surface performance and state are significantly changed
It is kind.The density value of commercial-purity aluminium is 2.7g/cm3It is 1 with relative density, after pure aluminium powder is squeezed by first passage, material
The consistency of material has reached 2.593g/cm3Reach 0.960 with relative density；After have passed through four passages extruding, material
Consistency has reached 2.657g/cm3, relative density reached 0.984.It can be seen that jacket-Equal Channel Angular Pressing can
To achieve the effect that make dusty material fine and close.
ECAP extrusion processes are as shown in Figure 2.Sample front end has just enter into mold corner zonal area, is in the aluminium powder in the regions a
Last particle is not affected by the effect of shearing, and internal void is still more, but due to being acted on by hydrostatic pressure, and hydrostatic pressure can be with
The limited volume for changing hole increases without changing shape, such consistency, this stage is based on the displacement of body of powder.
When aluminium powder powder material enters share zone (regions b), powder particle by big shearing force because being acted on, when suffered stress is more than
After to a certain degree, powder particle is plastically deformed, and makes to be consolidated well between particle, and small powder is particles filled to big
In the gap of powder particle, while some big powder particles are broken for small powder particle, are more advantageous to consistency in this way
It improves.This stage based on deforming, while also along with displacement.Due to shear-deformable being kept fine and close speed further fast by big
Speed rises, and the deformation of body of powder makes hole largely be closed.After material is squeezed into flow pass (regions c), material is in rigid
Property translation stage, does not deform, density no longer changes.
By observation it can be found that after four passages, significant refinement occurs for particle, and average particle size particle size is about
11.63 μm, segment boundary has tended to be fuzzy.It can be seen that：The first two passage thinning effect is best, the refinement of latter two passage
Decreased effectiveness, but remain to that particle is made to refine.With the increase for squeezing passage and accumulation strain, material internal particle distribution uniformity
It is improved with consistency, while basis material has also obtained a degree of processing hardening.Because with the processing of matrix
The aggravation of hardenability, material show better mechanical property, and deformation is more difficult.
Sample TEM organization charts after the second passage of the paths Bc extruding as shown in figure 4, to try after squeezing the first passage with the paths Bc
Sample TEM organization charts are as shown in figure 5, sample TEM organization charts are as shown in Figure 6 after squeezing four-pass with the paths Bc.By can be in figure
Find out, after four passages squeeze, crystal grain has obtained further refinement, and the sub boundary of intra-die is more perfect.Due in crystal grain
Also constantly to movement at sub boundary when the dislocation that portion generates, and accumulation occurs at sub boundary, tangles and buries in oblivion, leads to subgrain not
Disconnected broken, rotation, particle size distribution tend to be uniform, and transgranular comparison is clean, does not observe dislocation structure in grain boundaries, crystal boundary becomes
In straight.
Using the experimental technique of powder jacket ECAP, using pure aluminium powder particle as material, it is successfully realized powder particle
Directly it is solidified into the block grained material of high-compactness.
In conclusion only presently preferred embodiments of the present invention, is not used for limiting the scope of implementation of the present invention, it is all according to
Equivalent changes and modifications made by shape, construction, feature and spirit described in scope of the invention as claimed should all be included in this
In the right of invention.
Claims (6)
1. a kind of method that metal powder block prepares super fine crystal material, step include：
1) pure aluminium powder particle is encapsulated in metal capsule, then, the metal capsule equipped with pure aluminium powder particle is placed in pad
On piece is put into heating furnace, and the temperature of heating controls between 95~105 DEG C, keeps the temperature more than half an hour；
2) ECAP molds are heated to temperature identical with metal capsule；
3) material in metal capsule is put into ECAP molds and squeezes the extruding that path carries out four passages according to Bc.
2. the method that a kind of metal powder block according to claim 1 prepares super fine crystal material, which is characterized in that institute
The manufacturing process for the metal capsule stated is：It is big that fine aluminium ingot is cut into the required size of metal capsule with wire electric discharge
It is small, it is used in combination drilling machine to drill through a diameter of 80 millimeters of hole.
3. the method that a kind of metal powder block according to claim 2 prepares super fine crystal material, which is characterized in that will
The specimen surface of metal capsule polishes smooth smooth, the specimen surface and ECAP moulds of metal capsule in reduction equal channel angular pressing
Friction between the die wall of tool.
4. the method that a kind of metal powder block according to claim 1 prepares super fine crystal material, which is characterized in that institute
The thickness control of gasket is stated between 4.5~5.5 millimeters.
5. the method that a kind of metal powder block according to claim 1 prepares super fine crystal material, which is characterized in that institute
State medial angle Φ=120 ± 2 °, lateral angle Ψ=25 ± 0.5 ° of the corner in the Bc extruding path of ECAP molds.
6. the method that a kind of metal powder block according to one of claim 1 to 5 prepares super fine crystal material, feature
It is, the extrusion speed controls between 0.95~1.05 mm/second.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810194925.2A CN108480641A (en) | 2018-03-09 | 2018-03-09 | A kind of method that metal powder block prepares super fine crystal material |
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| CN201810194925.2A CN108480641A (en) | 2018-03-09 | 2018-03-09 | A kind of method that metal powder block prepares super fine crystal material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111719060A (en) * | 2020-05-19 | 2020-09-29 | 山东源航超轻材料研究院有限公司 | Surface modification of reinforcement for Mg-Li-based composite material and preparation method of prefabricated body of reinforcement |
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| KR20090118404A (en) * | 2008-05-13 | 2009-11-18 | 포항공과대학교 산학협력단 | Manufacturing method of aluminum alloy having good dynamic deformation properties |
| CN102189143A (en) * | 2011-03-24 | 2011-09-21 | 哈尔滨工程大学 | ECAE (equal channel angular extrusion) based preparation method of ultrafine crystal NiTi shape memory alloy tube |
| CN103252377A (en) * | 2013-04-25 | 2013-08-21 | 南京航空航天大学 | Mould of pure titanium equal channel angular extrusion and process method |
| CN104841711A (en) * | 2015-04-28 | 2015-08-19 | 中南林业科技大学 | Extrusion deformation processing die and process for preparation of ultrafine-grained beta titanium alloy |
| CN106217273A (en) * | 2016-08-30 | 2016-12-14 | 郑州磨料磨具磨削研究所有限公司 | A kind of diamond honing oil stone and preparation method thereof |
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2018
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Patent Citations (6)
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| CN101049616A (en) * | 2007-05-09 | 2007-10-10 | 中国科学院金属研究所 | Method for preparing lamellar composite material of heterogeneic alloy |
| KR20090118404A (en) * | 2008-05-13 | 2009-11-18 | 포항공과대학교 산학협력단 | Manufacturing method of aluminum alloy having good dynamic deformation properties |
| CN102189143A (en) * | 2011-03-24 | 2011-09-21 | 哈尔滨工程大学 | ECAE (equal channel angular extrusion) based preparation method of ultrafine crystal NiTi shape memory alloy tube |
| CN103252377A (en) * | 2013-04-25 | 2013-08-21 | 南京航空航天大学 | Mould of pure titanium equal channel angular extrusion and process method |
| CN104841711A (en) * | 2015-04-28 | 2015-08-19 | 中南林业科技大学 | Extrusion deformation processing die and process for preparation of ultrafine-grained beta titanium alloy |
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Non-Patent Citations (1)
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| 白添琪: "纯Al粉末及Al基SiC复合材料ECAP过程的组织性能研究", 《中国优秀硕士学位论文全文数据库》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111719060A (en) * | 2020-05-19 | 2020-09-29 | 山东源航超轻材料研究院有限公司 | Surface modification of reinforcement for Mg-Li-based composite material and preparation method of prefabricated body of reinforcement |
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Application publication date: 20180904 |
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