CN101333583B - Method for preparing short-flowpath fine crystal super-plastic material - Google Patents
Method for preparing short-flowpath fine crystal super-plastic material Download PDFInfo
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- CN101333583B CN101333583B CN2007100118874A CN200710011887A CN101333583B CN 101333583 B CN101333583 B CN 101333583B CN 2007100118874 A CN2007100118874 A CN 2007100118874A CN 200710011887 A CN200710011887 A CN 200710011887A CN 101333583 B CN101333583 B CN 101333583B
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Abstract
Disclosed is a process for preparing short process fine crystalline superplasticity materials, which is characterized in that: cast alloy is used as a starting material for carrying out the agitation and friction processing after the homogenization heat treatment, and a bulky, loose and uneven cast structure is changed into an even and compact fine crystalline superplasticity structure.
Description
Technical field:
The present invention relates to metallic substance, a kind of method for preparing short-flowpath fine crystal super-plastic material is provided especially, be applicable to processing aluminium alloy, magnesium alloy, zinc alloy, copper alloy.
Background technology:
Superplasticity progressively develops into a kind of sophisticated whole industrial part moulding process, is used widely at industrial circles such as automobile, aviations.Traditionally, hot mechanical processing tools is adopted in the preparation of fine crystalline superplastic aluminium alloy, relates to operations such as overaging processing, multi-pass warm-rolling, recrystallize processing, and operation is numerous and diverse, preparation cost is high.
Agitating friction processing is a kind of new metallic substance Technology of Plastic Processing that grows up on friction stir welding ultimate principle basis.Compare with other Technology of Plastic Processing, the agitating friction manufacturing procedure is simple, and step processing can realize the refinement of microtexture, adopts this technology to obtain the fine crystalline superplastic structure in several commercial aluminium alloys, obtains good superplasticity property.
Early stage research work all is parent materials (ActaMaterialia, vol.50, No.17 (2002) are p.4419-4430) of processing as agitating friction with milled sheet or stripper plate, and operation is numerous and diverse, and cost is higher.For simplifying manufacturing procedure, the investigator attempts directly using cast alloy as parent material, by agitating friction processing thick cast structure directly is transformed into the fine crystalline superplastic structure, and obtained superplasticity property (ScriptaMaterialia preferably, vol.50, No.7 (2004) are p.931-935).Yet, it is pointed out that because alloy-steel casting exists tangible component segregation and inhomogeneity of structure the difficult complete homogenizing that realizes composition and tissue of the not only poor processability of alloy, and step agitating friction processing.
Summary of the invention:
The object of the present invention is to provide a kind of method for preparing short-flowpath fine crystal super-plastic material, be applicable to processing aluminium alloy, magnesium alloy, zinc alloy, copper alloy.
The invention provides a kind of method for preparing short-flowpath fine crystal super-plastic material, it is characterized in that: use cast alloy as parent material, after homogenizing thermal treatment, carry out agitating friction processing again, thick, loose, uneven cast structure is transformed into even, fine and close fine crystalline superplastic structure.
In the method for preparing short-flowpath fine crystal super-plastic material of the present invention, after the alloy casting moulding, at (0.7-0.85) T
mTemperature under homogenizing thermal treatment carry out agitating friction processing, 400-1500 rev/min of machining tool rotating speed, gait of march 50-400 mm/min after 10-24 hour again.
The present invention proposes a new method for preparing short-flowpath fine crystal super-plastic material, use cast alloy as parent material, at first carry out homogenizing thermal treatment to improve casting composition segregation and inhomogeneity of structure, and then carry out agitating friction and process, thick cast structure is transformed into the fine crystalline superplastic structure, sets up casting+homogenizing thermal treatment+agitating friction new method for processing.Compare with rolling (extruding)+agitating friction working method, technology of the present invention obviously shortens preparation technology's flow process, the reduction manufacturing cost of fine crystalline superplastic material; Compare with casting+agitating friction working method, the inventive method can be prepared more uniform fine crystalline superplastic material, obviously improves the superplasticity property of material.Therefore, have reason to believe that this new fine crystalline superplastic material preparation process will have wide prospect in industrial application aspect the high-strength alloy superplastic formation.
Embodiment:
Embodiment 1
Use 7075 aluminium alloy as cast condition sheet materials of 8 mm thick, carry out carrying out agitating friction processing again after 24 hours homogenizing annealings are handled at 460 ℃, change under the machined parameters of a part clock, gait of march 100 mm/min at instrument rotating speed 1200, obtain the even fine crystalline structure of 3 microns of grain-sizes.The superplastic tension test shows, all obtains good superplasticity property in 350-470 ℃ temperature range, does not have abnormal grain to grow up at 470 ℃, still can obtain 700% superplasticity.Maximum superplasticity is 1050%, at 450 ℃ and 1 * 10
-2s
-1High strain rate under obtain.
Comparative example 1
Use 7075 aluminium alloy as cast condition sheet materials of 8 mm thick directly to carry out agitating friction processing, under the parameter of 1200 rev/mins of instrument rotating speeds, 100 millimeters part clocks of gait of march, obtain the fine crystalline structure of average grain size 3-5 micron, but grain-size with second mutually particle distribution be not very even.Superplastic tension test shows that 7075 aluminium alloys after the processing all obtain superplasticity in 400-450 ℃ temperature range, is higher than 450 ℃ and causes abnormal grain to grow up because tissue odds is even, and superplasticity disappears.Maximum superplasticity is 600%, at 450 ℃ and 1 * 10
-2s
-1High strain rate under obtain.
Embodiment 2
Use 2024 aluminium alloy as cast condition sheet materials of 6 mm thick, carry out carrying out agitating friction processing again after 12 hours homogenizing annealings are handled at 490 ℃, under the parameter of 500 rev/mins of instrument rotating speeds, gait of march 100 mm/min, obtain the even fine crystalline structure of 4.5 microns of grain-sizes.The maximum superplasticity that obtains is 450%, at 430 ℃ and 3 * 10
-3s
-1Strain rate under obtain.
Comparative example 2
Use 2024 aluminium alloy as cast condition sheet materials of 6 mm thick, under the parameter of 500 rev/mins of instrument rotating speeds, gait of march 100 mm/min, carry out agitating friction processing, processing back grain-size with second mutually particle distribution be not very even, average grain size is approximately the 5-7 micron.The maximum superplasticity that obtains is 300%, at 430 ℃ and 3 * 10
-3s
-1Strain rate under obtain.
Embodiment 3
Use the Mg-Zn-Y-Zr as cast condition sheet material of 6 mm thick, carry out carrying out agitating friction processing again after 10 hours homogenizing annealings are handled at 420 ℃, under the parameter of 600 rev/mins of instrument rotating speeds, gait of march 100 mm/min, obtain the even fine crystalline structure of 5 microns of grain-sizes.The maximum superplasticity that obtains is 550%, at 450 ℃ and 3 * 10
-3s
-1Strain rate under obtain.
Comparative example 3
Use the Mg-Zn-Y-Zr as cast condition sheet material of 6 mm thick, under the parameter of 600 rev/mins of instrument rotating speeds, gait of march 100 mm/min, carry out agitating friction processing, processing back grain-size with second mutually particle distribution be not very even, average grain size is approximately the 5-7 micron.The maximum superplasticity that obtains is 400%, at 450 ℃ and 3 * 10
-3s
-1Strain rate under obtain.
Embodiment 4
Use the Zn-22Al as cast condition sheet material of 5 mm thick, carry out carrying out agitating friction processing again after 8 hours homogenizing annealings are handled at 200 ℃, under the parameter of 500 rev/mins of instrument rotating speeds, gait of march 100 mm/min, obtain the even fine crystalline structure of 3 microns of grain-sizes.At 160 ℃ and 1 * 10
-3s
-1Strain rate under obtain 350% superplasticity.
Comparative example 4
Use the Zn-22Al as cast condition sheet material of 5 mm thick, carry out agitating friction and add under the parameter of 500 rev/mins of instrument rotating speeds, gait of march 100 mm/min, processing back grain size distribution is not very even, and average grain size is approximately the 3-5 micron.At 160 ℃ and 1 * 10
-3s
-1Strain rate under obtain 240% superplasticity.
Claims (3)
1. method for preparing short-flowpath fine crystal super-plastic material, it is characterized in that process is as follows: carry out homogenizing thermal treatment after the alloy casting moulding, to improve component segregation and inhomogeneity of structure, the homogenizing thermal treatment temp is (0.7-0.85) T
m, T wherein
mBe the melting temperature that material is represented with Kelvin, the time is 10-24 hour; Carry out agitating friction processing then.
2. according to the described method for preparing short-flowpath fine crystal super-plastic material of claim 1, it is characterized in that the agitating friction working process parameter is, 400-1500 rev/min of machining tool rotating speed, gait of march 50-400 mm/min.
3. according to the described method for preparing short-flowpath fine crystal super-plastic material of claim 1, it is characterized in that described alloy comprises aluminium alloy, magnesium alloy, zinc alloy or copper alloy.
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| CN2007100118874A CN101333583B (en) | 2007-06-28 | 2007-06-28 | Method for preparing short-flowpath fine crystal super-plastic material |
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| CN2007100118874A CN101333583B (en) | 2007-06-28 | 2007-06-28 | Method for preparing short-flowpath fine crystal super-plastic material |
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| CN101333583A CN101333583A (en) | 2008-12-31 |
| CN101333583B true CN101333583B (en) | 2010-09-15 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102560040B (en) * | 2010-12-24 | 2014-03-26 | 中国科学院金属研究所 | Short-flow plastic processing method for prolonging service life of gear/rack |
| CN102672276B (en) * | 2011-03-17 | 2014-10-22 | 中国科学院金属研究所 | Short-process plastic processing method for prolonging service life of saw blade |
| CN104985393B (en) * | 2015-06-10 | 2017-04-12 | 东北大学 | Manufacturing method capable of improving mechanical performance of thick 7050-T7451 aluminum alloy plate |
| CN109940259A (en) * | 2019-02-02 | 2019-06-28 | 中铝材料应用研究院有限公司 | A method of improving aluminum alloy plate materials bending and forming |
| CN109773327A (en) * | 2019-02-02 | 2019-05-21 | 中铝材料应用研究院有限公司 | A method of improving high-strength aluminium room temperature forming |
| CN115927980A (en) * | 2022-12-16 | 2023-04-07 | 中国科学院金属研究所 | Method for improving superplasticity of high-entropy alloy |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1968783A (en) * | 2004-03-24 | 2007-05-23 | Sii米加钻石公司 | Solid state processing of materials through friction stir processing and friction stir mixing |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1968783A (en) * | 2004-03-24 | 2007-05-23 | Sii米加钻石公司 | Solid state processing of materials through friction stir processing and friction stir mixing |
Non-Patent Citations (3)
| Title |
|---|
| Z.Y. Ma,et al..Superplasticity in cast A356 induced via friction stirprocessing.Scripta Materialia50.2004,50931-935. * |
| 朱战民等.搅拌摩擦加工(FSP)AZ91D镁合金的组织分析.热加工工艺36 4.2007,36(4),21-23,29. |
| 朱战民等.搅拌摩擦加工(FSP)AZ91D镁合金的组织分析.热加工工艺36 4.2007,36(4),21-23,29. * |
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