CN102952975A - High performance casting hypoeutectic Al-Si-Cu-Mg alloy - Google Patents

High performance casting hypoeutectic Al-Si-Cu-Mg alloy Download PDF

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Publication number
CN102952975A
CN102952975A CN2012104322842A CN201210432284A CN102952975A CN 102952975 A CN102952975 A CN 102952975A CN 2012104322842 A CN2012104322842 A CN 2012104322842A CN 201210432284 A CN201210432284 A CN 201210432284A CN 102952975 A CN102952975 A CN 102952975A
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alloy
high performance
hypoeutectic
casting
performance casting
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CN2012104322842A
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Chinese (zh)
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李润霞
于宝义
焦文祝
吴雪峰
杨叶
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Shenyang University of Technology
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Shenyang University of Technology
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Priority to CN2012104322842A priority Critical patent/CN102952975A/en
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Abstract

The present invention relates to a high performance casting hypoeutectic Al-Si-Cu-Mg alloy, which comprises the following raw materials, by mass, 6.5-7.5% of Si, 1.0-1.5% of Cu, 0.4-0.6% of Mg, 0.035-0.045%of Sr, 0.15-0.25% of Zr, and the balance of Al. The high performance casting hypoeutectic Al-Si-Cu-Mg alloy has high strong strength and good toughness under a certain process condition such as smelting, melt purification, alloying, grain refining and modification, has a room temperature tensile strength of more than 220 Mpa, an elongation rate of more than 4.1%, and a brinell hardness of more than 85HB under a metal type gravity casting condition, and is suitable for production of large scale thin-walled aluminum alloy casts bearing a high load.

Description

High performance casting hypoeutectic Al-Si-Cu-Mg alloy
Technical field
The present invention relates to a kind of aluminum alloy materials, especially relates to a kind of high performance casting hypoeutectic Al-Si-Cu-Mg alloy.
Background technology
Al-Si be the good fluidity, foundry goods of alloy fine and close, be difficult for producing casting crack, have good castability, etch resistant properties and medium machinability, but simple binary Al-Si alloy strength, hardness, toughness are general.The enhancement method of aluminium alloy generally comprises work hardening, solution strengthening, second-phase reinforcement, grain-boundary strengthening and complex intensifying etc.Wherein, the concrete ways that improves the obdurability of cast aluminium alloy is melt treatment (purification of rotten, melt and purifying, grain refining), alloying and thermal treatment etc.Add the Mg element in the Al-Si alloy and Mg occurs in the tissue later on 2The Si strengthening phase, behind the adding Cu element, within the specific limits, along with the raising of Cu content, its intensity significantly increases in the Al-Si-Mg alloy, and unit elongation constantly descends, and the heat resistance of alloy also constantly increases.Along with developing rapidly of in recent years space flight and aviation industry and automotive industry, people are more and more higher to the reliability requirements of foundry goods, the simultaneously requirement of alloy over-all properties and special property also improves constantly, conventional aluminium alloy can not satisfy the fields such as some traffic, space flight to the requirement of material, thus the exploitation high-performance aluminium alloy become in the urgent need to.
Summary of the invention
Goal of the invention:
The present invention provides a kind of high performance casting hypoeutectic Al-Si-Cu-Mg Alloy And Preparation Method by melting, cleaning molten, alloying, grain refining, modification process, and the cast alloy of making has good castability, higher unit elongation and good cutting ability.
Technical scheme:
A kind of high performance casting hypoeutectic Al-Si alloy is characterized in that: described alloy is that the raw material by following mass percent is prepared from: Si 6.5-7.5%, Cu 1.0-1.5%, Mg 0.4-0.6%, Sr 0.035-0.045%, Zr 0.15-0.25%, surplus is Al.
Described alloy is under the metal mold gravity casting condition, and room temperature tensile strength is greater than 220Mpa, and unit elongation is greater than 4.1%, and Brinell hardness is greater than 85HB.
Advantageous effect:
Technique effect of the present invention is: by melting, cleaning molten, alloying, grain refining, rotten comprehensive processing technique, can significantly purify melt, reduce inspiratory capacity and foreign matter content; The refinement primary α-Al, eutectic structure becomes tiny coralliform by thick faller gill shape, and the inner strengthening phase that forms of alloy has Mg 2Si, Al 2Cu etc.This alloy is under the metal mold gravity casting condition, and its room temperature tensile strength is greater than 220Mpa, and elongation is greater than 4.1%, and Brinell hardness is greater than 85HB, and this alloy also has good mechanical property and flowing property, and the over-all properties of alloy is significantly improved.
Embodiment:
The present invention relates to a kind of high performance casting hypoeutectic Al-Si alloy, it is characterized in that: described alloy is that the raw material by following mass percent is prepared from: Si 6.5-7.5%, Cu 1.0-1.5%, Mg 0.4-0.6%, Sr 0.035-0.045%, Zr 0.15-0.25%, surplus is Al.
Described alloy is under the metal mold gravity casting condition, and room temperature tensile strength is greater than 220Mpa, and unit elongation is greater than 4.1%, and Brinell hardness is greater than 85HB.
High performance casting hypoeutectic Al-Si alloy of the present invention adopts conventional aluminum melting process, adds alloy strengthening element Cu, Mg, grain refining element Zr, alterant element Sr in the Al-Si alloy.Wherein best proportioning is Si 6.5-7.5%, Cu 1.0-1.5%, and Mg 0.4-0.6%, Sr 0.035-0.045%, Zr 0.15-0.25%, surplus is Al.Used insulating covering agent is KCl and NaCl mixture (mass ratio is 1:1), add-on be 1%(alloy total mass 1%); Refining agent is 3/4C 2Cl 6+ 1/4Na 2SiF 6Mixture, add-on 0.6%, Na 2SiF 6To dry before using.Before the melting with bell jar, skimming ladle, etc. melting instrument and crucible inner wall cleaning clean, and preheating stenciling coating.The used coating formula of plumbago crucible (mass ratio) is: talcum powder (90%), water glass (10%), excess water.Smelting metal instrument coating formula (mass ratio) is: zinc oxide (25 ~ 30%), water glass (3 ~ 5%), excess water.
High performance casting hypoeutectic Al-Si alloy involved in the present invention, its melting technology is: crucible is preheated to garnet, first the fine aluminium ingot is put into crucible, after the fine aluminium fusing, the Al-Si master alloy that is preheated to about 300 ℃ is pressed in the melt, after 720 ℃ of melt temperature arrival, again the Al-Cu after the preheating, Al-Zr master alloy are pressed in the melt.With bell jar pure magnesium (aluminium foil parcel) is added in the melt behind the 15min, and stir gently.Insulation for some time, when melt temperature reaches 730 ℃, add 2/3 of refining agent total amount and carry out the refining first time, to slowly stir bell jar (not scratching crucible inwall and bottom) in the refining process, be sprinkled into 1/2 insulating covering agent refining is finished after at adding alterant master alloy Al-10Sr and at liquid level.Insulation is skimmed behind the 20min, adds remaining 1/3 refining agent again, skims subsequently and adds rapidly remaining 1/2 insulating covering agent.Cool to 720 ℃, pour into a mould after leaving standstill 15min.Casting metal mould temperature is 200 ℃.
The present invention is described further below in conjunction with specific embodiment:
Alloy melting carries out in 7.5KW crucible type resistance furnace.
Embodiment 1
The melting material therefor: high-purity Al(99.99%), technical pure Mg(99.9%), master alloy Al-26Si, Al-50Cu, Al-5Zr, Al-10Sr, analytical pure NaCl, analytical pure KCl, analytical pure Na 2SiF 6, C 2Cl 6
Raw material ratio (weight percent): Si 6.5%, and Cu 1.0%, and Mg 0.4%, and Sr 0.035%, and Zr 0.15%, and surplus is Al.
Press the mentioned component alloyage, first rafifinal is put into plumbago crucible, smelting temperature is set 720 ℃, melt rear adding Al-26Si master alloy fully until rafifinal, Deng adding Al-50Cu, Al-5Zr after its fusing, after metal melts fully, with bell jar pure magnesium (wrapping up with aluminium foil) is pressed in the aluminium alloy, insulation 5min, in the time of 730 ℃, add for the first time refining agent, consumption is 2/3 of total amount, adding alterant master alloy Al-10Sr and be sprinkled into 1/2 insulating covering agent at liquid level after refining is finished.Insulation is skimmed behind the 20min, then adds remaining 1/3 refining agent, skims subsequently and adds rapidly remaining 1/2 insulating covering agent.Cool to 720 ℃, pour into a mould after leaving standstill 15min.Casting metal mould temperature is 200 ℃.Fining agent Al-5Zr add-on is 0.15% of alloy amount, and alterant Al-10Sr add-on is 0.035%, and the refining agent add-on is 0.6% of alloy amount.This alloy is under the metal mold gravity casting condition, and room temperature tensile strength is greater than 220Mpa, and unit elongation is greater than 4.1%, and Brinell hardness is greater than 85HB.
Embodiment 2
The melting material therefor is identical with embodiment 1 with equipment.
Alloying constituent raw material ratio (weight percent): Si 7%, and Cu 1.2%, and Mg 0.5%, and Sr 0.04%, and Zr 0.2%, and surplus is Al.
Press the mentioned component alloyage, first rafifinal is put into plumbago crucible, smelting temperature is set 720 ℃, melt rear adding Al-26Si master alloy fully until rafifinal, Deng adding Al-50Cu, Al-5Zr after its fusing, after metal melts fully, with bell jar pure magnesium (wrapping up with aluminium foil) is pressed in the aluminium alloy, insulation 5min, in the time of 730 ℃, add for the first time refining agent, consumption is 2/3 of total amount, adding alterant Al-10Sr master alloy and be sprinkled into 1/2 insulating covering agent at liquid level after refining is finished.Insulation is skimmed behind the 20min, then adds remaining 1/3 refining agent, skims subsequently and adds rapidly remaining 1/2 insulating covering agent.Cool to 720 ℃, pour into a mould after leaving standstill 15min.Casting metal mould temperature is 200 ℃.Fining agent Al-5Zr add-on is 0.2% of alloy amount, and alterant Al-10Sr add-on is 0.04%, and the refining agent add-on is 0.6% of alloy amount.This alloy is under the metal mold gravity casting condition, and room temperature tensile strength is greater than 220Mpa, and unit elongation is greater than 4.1%, and Brinell hardness is greater than 85HB.
Embodiment 3
The melting material therefor is identical with embodiment 1 with equipment.
Alloying constituent raw material ratio (weight percent): Si 7.5%, and Cu 1.5%, and Mg 0.6%, and Sr 0.045%, and Zr 0.25%, and surplus is Al.
Press the mentioned component alloyage, first rafifinal is put into plumbago crucible, smelting temperature is set 720 ℃, melt rear adding Al-26Si master alloy fully until rafifinal, Deng adding Al-50Cu, Al-5Zr after its fusing, after metal melts fully, with bell jar pure magnesium (wrapping up with aluminium foil) is pressed in the aluminium alloy, insulation 5min, in the time of 730 ℃, add for the first time refining agent, consumption is 2/3 of total amount, adding alterant master alloy Al-10Sr and be sprinkled into 1/2 insulating covering agent at liquid level after refining is finished.Insulation is skimmed behind the 20min, then adds remaining 1/3 refining agent, skims subsequently and adds rapidly remaining 1/2 insulating covering agent.Cool to 720 ℃, pour into a mould after leaving standstill 15min.Casting metal mould temperature is 200 ℃.Fining agent Al-5Zr add-on is 0.25% of alloy amount, and alterant Al-10Sr add-on is 0.045%, and the refining agent add-on is 0.6% of alloy amount.Tensile strength is greater than 220Mpa under the metal mold gravity casting condition for this alloy, and unit elongation is greater than 4.1%, and Brinell hardness is greater than 85HB.

Claims (2)

1. high performance casting hypoeutectic Al-Si alloy is characterized in that: described alloy is that the raw material by following mass percent is prepared from: Si 6.5-7.5%, Cu 1.0-1.5%, Mg 0.4-0.6%, Sr 0.035-0.045%, Zr 0.15-0.25%, surplus is Al.
2. high performance casting hypoeutectic Al-Si alloy according to claim 1, it is characterized in that: described alloy is under the metal mold gravity casting condition, and room temperature tensile strength is greater than 220Mpa, and unit elongation is greater than 4.1%, and Brinell hardness is greater than 85HB.
CN2012104322842A 2012-11-02 2012-11-02 High performance casting hypoeutectic Al-Si-Cu-Mg alloy Pending CN102952975A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104195385A (en) * 2014-08-29 2014-12-10 沈阳工业大学 Permanent modifier capable of improving electrical conductivity of hypo eutectic Al-Si alloy as well as preparation method and using method of permanent modifier
CN105112748A (en) * 2015-09-08 2015-12-02 苏州慧驰轻合金精密成型科技有限公司 High-strength cast aluminum and preparing method thereof
CN105671376A (en) * 2016-01-26 2016-06-15 北京航空航天大学 High-strength and high-plasticity hypoeutectic aluminium-silicon alloy material manufactured through gravity casting and room-temperature cold rolling, and manufacturing method thereof
CN106947892A (en) * 2017-05-12 2017-07-14 南通江中光电有限公司 A kind of high tough anticorrosion aluminium material and preparation method thereof
CN106975736A (en) * 2017-05-16 2017-07-25 南通江中光电有限公司 A kind of complex thin-wall aluminium alloy step die-casting and molding technology
CN107055295A (en) * 2017-05-16 2017-08-18 南通江中光电有限公司 A kind of lightweight escalator aluminium alloy step and its manufacturing process
CN107385288A (en) * 2017-07-31 2017-11-24 江苏大学 A kind of zirconium is strontium compound microalloyed and the high tough aluminium copper silicon cast aluminium alloy gold and preparation method of kirsite
GB2553366A (en) * 2016-09-06 2018-03-07 Jaguar Land Rover Ltd A casting alloy
GB2554449A (en) * 2016-09-29 2018-04-04 Jaguar Land Rover Ltd A casting alloy
CN108193096A (en) * 2017-12-11 2018-06-22 南昌大学 A kind of hypoeutectic silumin alloy of high-strength and high ductility and preparation method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
焦文祝等: "《Mg含量对Al-Si-Cu-Mg合金组织和力学性能的影响》", 《2012年中国铸造活动周论文集》 *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104195385A (en) * 2014-08-29 2014-12-10 沈阳工业大学 Permanent modifier capable of improving electrical conductivity of hypo eutectic Al-Si alloy as well as preparation method and using method of permanent modifier
CN105112748A (en) * 2015-09-08 2015-12-02 苏州慧驰轻合金精密成型科技有限公司 High-strength cast aluminum and preparing method thereof
CN105671376A (en) * 2016-01-26 2016-06-15 北京航空航天大学 High-strength and high-plasticity hypoeutectic aluminium-silicon alloy material manufactured through gravity casting and room-temperature cold rolling, and manufacturing method thereof
GB2553366A (en) * 2016-09-06 2018-03-07 Jaguar Land Rover Ltd A casting alloy
GB2554449A (en) * 2016-09-29 2018-04-04 Jaguar Land Rover Ltd A casting alloy
CN106947892A (en) * 2017-05-12 2017-07-14 南通江中光电有限公司 A kind of high tough anticorrosion aluminium material and preparation method thereof
CN106975736A (en) * 2017-05-16 2017-07-25 南通江中光电有限公司 A kind of complex thin-wall aluminium alloy step die-casting and molding technology
CN107055295A (en) * 2017-05-16 2017-08-18 南通江中光电有限公司 A kind of lightweight escalator aluminium alloy step and its manufacturing process
CN107385288A (en) * 2017-07-31 2017-11-24 江苏大学 A kind of zirconium is strontium compound microalloyed and the high tough aluminium copper silicon cast aluminium alloy gold and preparation method of kirsite
CN108193096A (en) * 2017-12-11 2018-06-22 南昌大学 A kind of hypoeutectic silumin alloy of high-strength and high ductility and preparation method thereof
CN108193096B (en) * 2017-12-11 2020-06-16 南昌大学 High-strength high-toughness hypoeutectic aluminum-silicon casting alloy and preparation method thereof

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Application publication date: 20130306