CN105274371A - Method for improving overall performance of AA7075 aluminum alloy by adding rare earth Sb - Google Patents
Method for improving overall performance of AA7075 aluminum alloy by adding rare earth Sb Download PDFInfo
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- CN105274371A CN105274371A CN201410304376.1A CN201410304376A CN105274371A CN 105274371 A CN105274371 A CN 105274371A CN 201410304376 A CN201410304376 A CN 201410304376A CN 105274371 A CN105274371 A CN 105274371A
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Abstract
In order to refine crystalline grains of AA7075 aluminum alloy and improving the mechanical property of the AA7075 aluminum alloy, the invention discloses a method for improving the overall performance of the AA7075 aluminum alloy by adding rare earth Sb. The rare earth Sb element is added to the as-cast-condition AA7075 aluminum alloy with the temperature of 720 DEG C. The rare earth Sb element accounts for, by mass, 0.3%. The AA7075 aluminum alloy is smelted through a conventional melting mode.
Description
Technical field
The present invention relates to a kind of rare earth Sb that adds to improve the method for AA7075 aluminium alloy over-all properties, belong to AA7075 aluminium alloy capability optimisation technique field.
Background technology
The rare earth resources of China is very abundant, and according to the data that Roskill information firm of Britain in 2003 announces, the rare earth reserves of China are 2,700 ten thousand t, account for the world always the amount of accumulateing 307%.How Devoting Major Efforts To Developing and utilize so abundant rare earth resources to become the new study hotspot of of China's material circle.AA7075 aluminium alloy has hot strength, etch resistant properties, welding property, good casting property, and machinability is superior, but due to can not thermal treatment, mechanical property be lower.Because it is mainly for the manufacture of the part such as engine, rotor, blade, oil engine, petrifaction gas pump case bearing medium load under the corrosive medium such as seawater, combustion gas, the mechanical property such as tensile strength, elongation, hardness of these parts to material is proposed very high requirement.
Summary of the invention
The technical problem to be solved in the present invention: provide a kind of rare earth Sb that adds to improve the method for AA7075 aluminium alloy over-all properties, can the crystal grain of refinement AA7075 aluminium alloy, suppressing the recrystallize of alloy, keeping its deformation recovery tissue, so as to putting forward heavy alloyed mechanical property.
Technical scheme of the present invention:
A kind of rare earth Sb that adds is to improve the method for AA7075 aluminium alloy over-all properties, be add rare earth Sb element in the as cast condition AA7075 aluminium alloy of 720 DEG C in temperature, described rare earth Sb element counts 0.3% with massfraction, and surplus is AA7075 aluminium alloy, adopts conventional smelting mode to smelt.
Described rare earth Sb element adds in the mode of master alloy.
Described master alloy is Al-Sb alloy.
Beneficial effect of the present invention:
After the present invention passes through to add Sb in as cast condition AA7075 aluminium alloy, contribute to the crystal grain of refinement cast alloy, its grain size is 30 ~ 40 m, and the secondary precipitation Al3 (Sb that interpolation Sb is formed, Zr) disperse phase can suppress the recrystallize of matrix alloy, keeps its deformation recovery tissue.Add 0.3%Sb in AA7075 aluminium alloy after, the effect of optimization of the tensile strength of alloy, yield strength and fracture toughness property is obvious.
accompanying drawing illustrates:
Fig. 1 is the micro-organization chart of alloy A A7075 when as cast condition and homogenizing state;
Fig. 2 is the micro-organization chart of alloy A A7075Sb when as cast condition and homogenizing state.
embodiment:
Embodiment:
Based on AA7075 aluminium alloy (composition is: Al-7.5Zn-1.5Mg-1.6Cu-0.2Zr), add 0%Sb (alloy A A7075) and 0.3%Sb (alloy A A7075Sb) respectively, starting material add with forms such as A00 fine aluminium, pure magnesium, pure zinc, made of Al-Cu alloy, Al-Zr alloy and Al-Sb alloys.Alloy melting carries out in resistance furnace, and melt pours in swage 720 DEG C time.Ingot casting carries out Homogenization Treatments 24h at 450 DEG C, is then forged into the forging of thickness 15mm at 430 DEG C in the mode of flat-die forging, and short transverse forging deformation amount is 90%.Alloy after forging adopts step heating mode to carry out solution treatment, and technique is: (200 DEG C, 24h)+(450 DEG C, 1h)+(470 DEG C, 1h), and room temperature shrend after alloy solid solution process, 130 DEG C of ageing treatment.
LEICAMEF4A/M microscope carries out metallographicobservation.JSM 6360 type scanning electron microscope, JEM 100CX type transmission electron microscope and TecnaiG220 transmission electron microscope carry out microstructure analysis.Transmission electron microscope film sample adopts the two spray of electrolysis thinning, and electrolytic solution is 30% nitric acid and 70% methyl alcohol mixed liquor.CS 41100 drawing machine carries out stretching experiment, adopts the fracture toughness KIC ((S-L) of socle girder method test material.All test datas are the mean value of 3 samples.Adopt 7501 type eddy current conductivity apparatus to measure the specific conductivity of alloy under different states, each sample measurement 5 times is also averaged.
Contrasted from Fig. 1 and Fig. 2, in AA7075 aluminium alloy, add 0.3%Sb, contribute to the crystal grain of refinement cast alloy, its grain size is 30 ~ 40 m, can be found out by table one, and the mechanical property of AA7075Sb comparatively AA7075 is compared and promoted obviously.
Claims (3)
1. one kind is added rare earth Sb to improve the method for AA7075 aluminium alloy over-all properties, it is characterized in that: be add rare earth Sb element in the as cast condition AA7075 aluminium alloy of 720 DEG C in temperature, described rare earth Sb element counts 0.3% with massfraction, surplus is AA7075 aluminium alloy, adopts conventional smelting mode to smelt.
2. a kind of rare earth Sb that adds according to claim 1 is to improve the method for AA7075 aluminium alloy over-all properties, it is characterized in that: described rare earth Sb element adds in the mode of master alloy.
3. a kind of rare earth Sb that adds according to claim 3 is to improve the method for AA7075 aluminium alloy over-all properties, it is characterized in that: described master alloy is Al-Sb alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410304376.1A CN105274371A (en) | 2014-06-30 | 2014-06-30 | Method for improving overall performance of AA7075 aluminum alloy by adding rare earth Sb |
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| CN201410304376.1A CN105274371A (en) | 2014-06-30 | 2014-06-30 | Method for improving overall performance of AA7075 aluminum alloy by adding rare earth Sb |
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| CN105274371A true CN105274371A (en) | 2016-01-27 |
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| CN201410304376.1A Pending CN105274371A (en) | 2014-06-30 | 2014-06-30 | Method for improving overall performance of AA7075 aluminum alloy by adding rare earth Sb |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108588517A (en) * | 2018-08-07 | 2018-09-28 | 合肥岑遥新材料科技有限公司 | A kind of ultra-fine grained aluminium alloy prepared applied to pipe fitting |
| CN108831585A (en) * | 2018-06-26 | 2018-11-16 | 山东欣意铝合金电缆有限公司 | A kind of the rare earth high-iron aluminum alloy cable conductor and its manufacturing method of high Fe content |
| CN108879141A (en) * | 2018-06-26 | 2018-11-23 | 山东欣意铝合金电缆有限公司 | A kind of creep resistant copper-aluminum transition terminal |
| CN115029593A (en) * | 2022-06-08 | 2022-09-09 | 山东南山铝业股份有限公司 | Composite rare earth-added heat-resistant aluminum alloy and preparation method thereof |
-
2014
- 2014-06-30 CN CN201410304376.1A patent/CN105274371A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108831585A (en) * | 2018-06-26 | 2018-11-16 | 山东欣意铝合金电缆有限公司 | A kind of the rare earth high-iron aluminum alloy cable conductor and its manufacturing method of high Fe content |
| CN108879141A (en) * | 2018-06-26 | 2018-11-23 | 山东欣意铝合金电缆有限公司 | A kind of creep resistant copper-aluminum transition terminal |
| CN108588517A (en) * | 2018-08-07 | 2018-09-28 | 合肥岑遥新材料科技有限公司 | A kind of ultra-fine grained aluminium alloy prepared applied to pipe fitting |
| CN115029593A (en) * | 2022-06-08 | 2022-09-09 | 山东南山铝业股份有限公司 | Composite rare earth-added heat-resistant aluminum alloy and preparation method thereof |
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Application publication date: 20160127 |