CN103781927B - High-strength aluminum alloy extrudate with excellent corrosion resistance, ductility, and hardenability and process for producing same - Google Patents

High-strength aluminum alloy extrudate with excellent corrosion resistance, ductility, and hardenability and process for producing same Download PDF

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Publication number
CN103781927B
CN103781927B CN201380002929.1A CN201380002929A CN103781927B CN 103781927 B CN103781927 B CN 103781927B CN 201380002929 A CN201380002929 A CN 201380002929A CN 103781927 B CN103781927 B CN 103781927B
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ductility
corrosion resistance
aluminum alloy
extrusion
strength aluminum
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CN103781927A (en
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柴田果林
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Aisin Keikinzoku Co Ltd
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Aisin Keikinzoku Co Ltd
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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
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/047—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with magnesium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • C22C21/04—Modified aluminium-silicon alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
    • 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
    • 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
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
    • 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
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/05—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Extrusion Of Metal (AREA)

Abstract

The purpose of the present invention is to provide: an Al-Mg-Si type high-strength aluminum alloy extrudate which has excellent corrosion resistance and ductility and which has satisfactory hardenability during extrusion and thereby has high productivity; and a process for producing the extrudate. The extrudate is characterized by containing, in terms of mass%, 0.65-0.90% Mg, 0.60-0.90% Si, 1.0-1.3% Mg2Si as a stoichiometric composition, the excess of Si over the stoichiometric composition Mg2Si being 0.10-0.30% of the alloy composition, 0.20-0.40% Cu, 0.20-0.40% Fe, 0.10-0.20% Mn, Fe+Mn being 0.35% or more, and 0.005-0.1% Ti, with the remainder comprising aluminum and unavoidable impurities.

Description

Corrosion resistance, ductility and quenching hardening excellent high-strength aluminum alloy extrusion Material and its manufacture method
Technical field
The present invention relates to the extruded material using Al-Mg-Si class aluminium alloy.
Background technology
In recent years, from the viewpoint of environment of preserving our planet, even if in automotive field, also require that and row is improved by lightweight Sail performance, improve fuel efficiency.
In the requirement car body lightweight as one of the method improving automobile fuel efficiency, have studied in automobile construction material The application of aluminium alloy extruded section bar in material.
As automobile building material it is desirable to high intensity, bendability, corrosion resistance are although notice JIS7000 system Aluminium alloy（Al-Zn-Mg class）With JIS6000 line aluminium alloy（Al-Mg-Si class）, but 7000 line aluminium alloys are natural aging type Alloy, has the shortcomings that the operation length from extrusion molding to bending machining and hardening processing therebetween become difficult, and, 7000 is Corrosion resistance under ambient stress for the aluminium alloy declines.
Then, 6000 line aluminium alloys are considered as the heat treatment type holding promise as non-natural aging and excellent corrosion resistance Alloy.
But, the extruded material being formed by 6000 line aluminium alloys of conventional High Intensity, there is tensile strength height but stretch special Property insufficient, be susceptible to during bending machining ftracture shortcoming.
And, in order to obtain high intensity, carry out water cooling immediately after extrusion processing and carry out pressure quench hardening（プレ ス end enters れ）.
The solid solution heated again after although the pressure quench hardening of water cooling has and can obtain and extrude Change the advantage that quenching hardening processes almost identical property, but difference of the cross sectional shape based on extruded material, thickness etc., The cooling velocity at each position in section produces difference, has the temperature distributing disproportionation of extruded material in cooling and deforms, chi The sheet of very little poor accuracy and cross sectional shape becomes difficult, and if wanting to prevent the generation of such deformation, cross sectional shape The problem that diminishes of the free degree.
Additionally, also having the problem of more air cooled high cost.
On the other hand, although being had compared with the pressure quench hardening by water cooling by air cooled quenching hardening The advantage of low cost, but have and be unable to obtain high intensity by limited the led to alloy composition of cooling velocity, that is, Make the also poor problem of ductility in the case of can obtaining high intensity.
Patent document 1 discloses that, Mg：0.4～0.8%, Si：0.3～0.9%, Cu 0.05%, Mn+Cr+Zr 0.095%, The Mg that more than 3 μm of extrusion direction length2Si measures 50/mm2, axially crushing characteristic, the aluminium alloy extruded material of excellent corrosion resistance Material, although forming excellent corrosion resistance with this alloy, but resistance to force value as little as about 220MPa is it is believed that light weight for product Change can not have sufficient contribution, and the pressure quench hardening implemented also is to be used mostly the method for water cooling it is therefore contemplated that squeezing Go out productivity also low.
The interpolation being made Cu, Mn, Cr, Zr due to impurity treatment is restricted, therefore it is desired that not improving ductility Effect.
Additionally, patent document 2 discloses that, Mg：0.45～0.75%, Si：0.45～0.80%, excessive Si amount 0.1～0.4%, Mn：0.15～0.40%, Cr：0～0.1%, the dispersion of Mn, Cr class compound fine is obtained, quenching hardening, axially crushing are special Property excellent aluminum alloy extrusion material, be used air cooling as this point of pressure quench method for curing from the point of view of productivity excellent, But resistance to force value as little as about 220MPa.
Due to needing to add the Cr making its quenching hardening sensitiveness sharp, make endurance in order to air cooled cooling means It is difficult that value improves.
Patent document 1：Japanese Laid-Open 2002-285272 publication
Patent document 2：Japanese Laid-Open 2004-225124 publication
Content of the invention
（Problems to be solved by the invention）
The object of the invention is for providing one kind excellent due to corrosion resistance, ductility, and has good quenching when extruding processing Fiery hardening and the high Al-Mg-Si class high-strength aluminum alloy extruded material of productivity and its manufacture method.
（The method of solve problem）
According to the corrosion resistance of the present invention, ductility and the excellent high-strength aluminum alloy extruded material of quenching hardening, It is characterized in that, containing in terms of quality %：Mg：0.65～0.90%, Si：0.60～0.90%, as stoichiometric composition Mg2Si is 1.0～1.3%, and the Mg with respect to this stoichiometric composition2The excessive Si of Si measure for 0.10 in alloy composition～ 0.30%；Cu：0.20～0.40%, Fe：0.20～0.40%, Mn：0.10～0.20%, and Fe+Mn 0.35%；Ti：0.005～ 0.1%；Remainder is aluminium and inevitable impurity.
And, such extruded material is, using the aluminium alloy of above-mentioned constituent, processed and in this extrusion by extrusion Immediately to cool down the condition cooling that average speed is less than 100 DEG C/minute after processing, then carry out Artificial ageing and obtain.
If cooling velocity is below 100 DEG C/minute, without water cooling, fan can be carried out after extrusion processing immediately empty Air cooling, can carry out hardening by air cooled pressure quench.
For example, if the extruded material extruded with extrusion pressure with fan coolling, 50～100 DEG C/minute can be obtained Cooling velocity.
The extruded material thus produced, the average grain diameter with the crystal grain of aspect ratio more than 4.0 below 80 μm, There is the endurance of σ=0.2% in more than 280MPa.
Aspect ratio described herein refers to, to extend the extrusion direction of the crystal grain of the recrystallization texture obtaining in extrusion direction Length be L1, with the length in perpendicular direction as L2, obtained L1/L2Value.
Described average grain diameter refers to the circumscribed average diameter of crystal grain.
And, according to the extrusion profile of the present invention have by Charpy impact test obtain in 20J/cm2Above is resistance to Impact value.
The reasons why below selected components scope is described.
<Mg, Si>
Mg and Si passes through Mg2The precipitation of Si gives extruded material intensity.
Because any one addition crosses at most extrudability decline, therefore set the upper limit of the upper limit of Mg as 0.90%, Si For 0.90%.
While considering extrudability, in order to obtain the 0.2% resistance to force value in more than 280MPa, set Mg2The amount of Si is 1.0 ～1.3%.
Herein, with respect to stoichiometric Mg2The amount of the excessive Si of Si compares without compromising on extrudability, and enables to 0.2% resistance to force value increases.
But, at most ductility is crossed due to the amount of excessive Si and declines, therefore the amount of excessive Si is scheduled on 0.10～ 0.30%.
From it is easy to ensure that from the viewpoint of ductility, preferably the amount of excessive Si is limited in 0.10～0.20% scope.
<Cu>
Cu composition gives solution hardening, is then able to ensure that extensibility with the amount of defined.
But, addition cross at most corrosion resistance decline, extrudability also deteriorate, therefore Cu composition is scheduled on 0.2～0.4% Scope.
<Fe>
It is a feature of the present invention that Fe composition is limited in 0.20～0.40% scope.
Make crystal grain miniaturization in the metallographic structure after extrusion processing of Fe composition, improve ductility.
And, the miniaturization adding ingredient known in the art such as Mn, Cr, Zr, even if after being processed by extrusion immediately Fan air cools down, and quenching hardening sensitiveness also becomes strong, but this Fe composition does not strengthen quenching hardening sensitiveness, can be with 100 The abundant quenching hardening of cooling velocity below DEG C/minute.
<Mn>
Quenching hardening sensitiveness is had influence on, this is this in Mn fan air cooling immediately after extrusion processing as described above Well known to field, but, the result of the wholwe-hearted research of the present inventor understands, if below 0.20%, by fan air Can not give quenching hardening sensitiveness big impact in the pressure quench hardening of cooling, if Mn composition is 0.10～0.20% Scope, then formed and inhibit crack propagation, tying again of extending in extrusion direction compared with spherical recrystallization texture Crystal structure, forms the also little metallographic structure of its average crystal grain particle diameter.
Therefore, the total amount of Fe and Mn is set as Fe+Mn 0.35%.
<Ti>
Tell in the miniaturization of crystal grain during the casting of billet used in extrusion for the Ti, preferably add 0.005 ～0.10%.
Ti easily produces thick intermetallic compound more than 0.10% it is difficult to eliminate in extrusion processing, extruded material Intensity decline.
<Other compositions>
The above-mentioned other composition of Cr, Zr, Zn etc., individually below 0.05%, below 0.15%, then conduct can not for total amount The impurity avoiding is allowed.
（Invention effect）
The present invention, by setting stoichiometric Mg2Si composition 1.00～1.30%, excessive Si amount 0.10～ 0.30% scope it can be ensured that extrudability, seeks the raising of resistance to force value；By setting Fe：0.20～0.40%, Mn：0.10～ 0.20%, Fe+Mn 0.35%, can obtain high intensity and ductility using by air cooled pressure quench hardening simultaneously. And, impact resistance value also improves.
Brief description
[Fig. 1] shows that the one-tenth of billet used in experimental evaluation is grouped into.
[Fig. 2] shows the manufacturing condition of experimental evaluation.
[Fig. 3] shows evaluation result.
[Fig. 4] shows the comparative example of the metallographic structure of extruded material.
Specific embodiment
Casting, the extrusion evaluation result of the billet of various chemical compositions are below described.
Modulation Fig. 1 table shown in alloying component motlten metal, with casting speed as 60mm/min more than speed The cylindrical billet of 8 inches of diameter of casting.
Subsequent manufacturing condition is shown in the table of Fig. 2.
By the billet being cast with the temperature homogenize process 2～6 hours of 565～595 DEG C of HOMO condition.
By billet after 480～520 DEG C of preheatings, extrusion size is W=50mm, H=40mm, and thickness is t=3mm, by mouth word The extruded material that the hollow sectional shape of shape is formed.
Extruded velocity now and cooling velocity are shown in the table of Fig. 2.
The pressure quench being cooled down by fan air hardening is set in 50～100 DEG C/minute of target cooling velocity by the present invention Scope, only comparative example 5 be 200 DEG C/minute.
Then, the extrusion material of normal temperature is cooled to 185～200 DEG C × 3～3.5 hours Artificial ageings of heat treatment condition Material.
The evaluation result of the characteristic of the extruded material thus producing is shown in the table of Fig. 3.
<Assessment item and evaluation method>
（1）For tensile strength, 0.2% endurance and extensibility, cut from extruded material based on Japanese Industrial Standards JISZ2241 Cut out JIS-4 tensile test piece, be measured using according to the tensile testing machine of JIS standard.
（2）For microstructure, cut out sample, after its surface mirror finish processing, optical microscope uses 3% The NaOH aqueous solution carries out the surface of the etch processes of 40 DEG C × 3 minutes.
The alloy of the prior art shown in Fig. 4 is the metallographic structure photo of comparative example 1, and exploitation alloy shows embodiment 1 The example of metallographic structure.
Aspect ratio is, with the length in the extrusion direction of crystal grain as L1, with the length in perpendicular direction as L2, the L that tries to achieve1/ L2Mean value（N=5～10）.
And, crystallization particle diameter tries to achieve mean value with circumscribed diameter（N=5～10）.
（3）For corrosion resistance, evaluate anticorrosion stress-resistant cracking behavior（SCC resistance）.
Next No. 1 sample based on JIS H8711 for the preparation, implemented with the state of 100% stress of load 0.2% proof stress Cyclic test.
1 circulation：The 3.5%NaCl aqueous solution, 25 DEG C, 10 minutes → 25 DEG C, humidity 40%, the natural drying of 50 minutes, real Apply 720 such circulations and do not occur situation about ftractureing to be qualified.
（4）Impact resistance value is to make No. 4 tensile test pieces of JIS v-notch based on JIS Z2242 from extrusion profile, uses The impact resistance value being measured according to the Charpy impact tester of JIS standard.
It is 20J/cm as impact resistance value target2More than.
<Evaluation result>
According to embodiments of the invention 1～10 compared with comparative example 1～15, the extruded material of embodiment 1～10 first Metallographic structure（Microstructure）For the recrystallization of flat, and the average crystallite particle diameter of crystallization more than 4.0 for the aspect ratio Below 80 μm.
Additionally, in mechanical property, any one endurance of embodiment 1～10 is the high intensity of more than 280MPa, and There is more than 8% extensibility as ductility.
In addition, charpy impact value is in 20J/cm2More than.
On the other hand, though the extensibility high endurance of comparative example 1～5 is low.
This is because the Cu composition of comparative example 1～3 is few, the reason excessive Si is few.
Additionally, being due to the Mg of comparative example 42The amount of Si is few, all little former of the value of excessive Si and Mn+Fe of comparative example 5 Cause.
The endurance of comparative example 6～8 and extensibility are also poor.
This be few due to the composition of Fe, Cu, Mg due to.
Although the endurance of comparative example 9～13 has reached, desired value extensibility is poor, and impact resistance value is also low.
This be few due to the amount of Fe+Mn due to.
Comparative example 14 is few due to the value of excessive Si, Fe+Mn, and therefore endurance, extensibility, impact resistance value are low.
Although comparative example 15 is more than the addition of Si and Mg, because excessive Si is few, therefore endurance is low.
（The possibility of industrial utilization）
According to the aluminum alloy extrusion material of the present invention, because corrosion resistance, ductility and quenching hardening are excellent, therefore can Enough it is widely used in the building material of vehicle, machinery etc..

Claims (2)

1. the manufacture method of a kind of corrosion resistance, ductility and the excellent high-strength aluminum alloy extruded material of quenching hardening, It is characterized in that, using containing in terms of quality %：Mg：0.65～0.90%, Si：0.60～0.90%, as stoichiometry group The Mg becoming2Si is 1.0～1.3%, and the Mg with respect to this stoichiometric composition2The excessive Si of Si measures as in alloy composition 0.10～0.30%；Cu：0.20～0.40%, Fe：0.20～0.40%, Mn：0.10～0.20%, and Fe+Mn 0.35%； Ti：0.005～0.1%；Remainder is the aluminium alloy of aluminium and inevitable impurity, with casting speed as 60mm/min more than Speed casting billet, by the billet being cast with 565～595 DEG C of homogenize process, then carry out extrusion processing, and squeeze at this Immediately to cool down the condition air cooling for 50-100 DEG C/minute for the average speed after going out processing, then by carrying out at artificial ageing Reason makes resistance to force value in more than 280MPa.
2. corrosion resistance according to claim 1, ductility and quenching hardening excellent high-strength aluminum alloy extrusion The manufacture method of material is it is characterised in that the metallographic structure in extruded material is the recrystallization of flat, and aspect ratio is 4.0 , below 80 μm, the impact resistance value being obtained by Charpy impact test is in 20J/cm for the average grain diameter of above crystal grain2More than.
CN201380002929.1A 2012-01-31 2013-01-30 High-strength aluminum alloy extrudate with excellent corrosion resistance, ductility, and hardenability and process for producing same Active CN103781927B (en)

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JP6612029B2 (en) * 2015-01-28 2019-11-27 アイシン軽金属株式会社 High strength aluminum alloy extruded material with excellent impact resistance and method for producing the same
JP2016222958A (en) * 2015-05-28 2016-12-28 株式会社神戸製鋼所 High strength aluminum alloy sheet
CN105238970B (en) * 2015-11-18 2016-12-28 全椒县志宏机电设备设计有限公司 A kind of aluminium alloy of high-strength high-tractility
WO2019089736A1 (en) 2017-10-31 2019-05-09 Arconic Inc. Improved aluminum alloys, and methods for producing the same
US10646914B2 (en) 2018-01-12 2020-05-12 Accuride Corporation Aluminum alloys for applications such as wheels and methods of manufacture
CN109778030B (en) * 2019-03-19 2022-03-04 苏州铭恒金属科技有限公司 Novel aluminum alloy material and preparation thereof
CN113597478A (en) * 2021-03-31 2021-11-02 三菱铝株式会社 High-strength aluminum alloy extruded material having excellent surface quality

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EP2811043A1 (en) 2014-12-10
US20140166165A1 (en) 2014-06-19
CN103781927A (en) 2014-05-07
EP2811043B1 (en) 2016-07-27
EP2811043A4 (en) 2015-11-18

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