CN105908029B - A kind of superhigh intensity non-rapid solidification aluminium alloy and preparation method thereof - Google Patents

A kind of superhigh intensity non-rapid solidification aluminium alloy and preparation method thereof Download PDF

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CN105908029B
CN105908029B CN201610432186.7A CN201610432186A CN105908029B CN 105908029 B CN105908029 B CN 105908029B CN 201610432186 A CN201610432186 A CN 201610432186A CN 105908029 B CN105908029 B CN 105908029B
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alloy
mass percent
aluminium alloy
aluminium
melting
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CN105908029A (en
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许晓静
朱金鑫
丁清
吴瑶
孙良省
谈成
张香丽
杨帆
杜东辉
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Jiangsu University
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/02Making alloys by melting
    • C22C1/03Making alloys by melting using master alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/10Alloys based on aluminium with zinc as the next major constituent
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/053Changing 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 zinc as the next major constituent

Abstract

The invention discloses a kind of 770MPa grade super strengths non-rapid solidification aluminium alloy and preparation method thereof, belong to superpower technical field of aluminium alloy preparation, in aluminium alloy, the mass percent of zinc is 8.8~9.4%, and the mass percent of magnesium is 2.75~2.85%, and the mass percent of copper is 1.8~2.2%, the mass percent of zirconium is 0.25~0.55%, the mass percent of strontium is 0~0.025%, and surplus is aluminium, and the ratio of Zn and Mg mass percent should meet 3≤Wt in alloying elementZn/WtMg≤ 4, Mg mass percent WtMg2%≤Wt should be metMg≤ 3%.The preparation technology of the alloy includes successively:Founding, homogenizing anneal, hot extrusion, solution treatment, Ageing Treatment, the aluminium alloy tensile strength of gained is in 770MPa levels, while elongation percentage is maintained at more than 7.0%, and technique is simple, and cost is low, more conducively industrialization.

Description

A kind of superhigh intensity non-rapid solidification aluminium alloy and preparation method thereof
Technical field
The invention belongs to metal alloy field, more particularly to a kind of 770MPa grade super strengths non-rapid solidification aluminium alloy and Its preparation method.
Background technology
Aluminium alloy is typical lightweighting materials, have density is low, intensity is high, good toughness, corrosion-resistant, easy processing, easily return Receive, the features such as manufacturing cost is low, the basic industries strength that can rely on is strong, civil-military inosculation is good, its combination property or a certain important The great-leap-forward lifting of individual event performance, the development for different times Advanced Equipment, serves very strong supporting role.For a long time Since, development intensity rank is higher, the aluminium alloy of combination property more balance optimizing is always a very important research class Topic, it is related to the numerous areas such as a national Aero-Space, weaponry, general industry, resources conservation, environmental protection Development level, it is always one of science and technology field most hotly competitive in the world.
The 1990s mid-term, developed country using injection shaping flash set technology successfully have developed 750MPa The superpower aluminium alloy of intensity level, its exemplary alloy are RSA7034 (Al-11Zn-2.3Mg-1Cu), are marched at the forefront of the world.But Prepared by injection shaping flash set technology is difficult to prepare large-scale ingot blank aluminium alloy, and price is high, limits its application.
Chinese patent CN101338391 disclose it is a kind of have high intensity height prolong toughness quickly solidify block aluminum alloy and its Preparation method, although this quick solidification block aluminum alloy intensity is high, but preparation technology is the quick solidification of injection shaping Technology, cost is very high, and this technology can only prepare millimetre-sized block aluminum alloy, basically can not be applied to actual production In.
Chinese patent CN102127665 discloses a kind of Al-Zn-Mg-Cu- used as super High Strength Cast Aluminum Alloy Sc-Zr-RE alloys and preparation method thereof, wherein RE are both yttriums of Er or Yb, and both elements are rare earth Metallic element, price is relatively expensive, and cost of material is higher, while aluminium alloy maximum pulling strength prepared by this method can reach 605MPa, no substantive breakthroughs compared with international most advanced level.
Chinese patent CN103993211 discloses a kind of strong non-rapid solidification aluminium alloy of 720-750MPa superelevation and its preparation Method, the intensity of this aluminium alloy can reach 720-750MPa, but patent only gives the composition of alloy, to master alloying member Relation between cellulose content is not defined, and has certain limitation, and this alloy need to be by founding-homogenize Annealing-hot extrusion-pre- recovery annealing-solution treatment-predeformation-Ageing Treatment, handling process up to seven, technique is relatively numerous It is trivial, it is unfavorable for industrialized production, and some of which technique also has the space of optimization.
Up to the present, there has been no a kind of 770MPa grade super strengths non-rapid solidification aluminium with independent intellectual property right to close Gold and preparation method thereof is available, and this constrains the industrial expansions such as China's Aero-Space, weaponry to a certain extent.
The content of the invention
The purpose of the present invention is designed by composition design and technology of preparing, and it is non-fast to invent a kind of 770MPa grade super strengths Solid aluminium alloy of rapid hardening and preparation method thereof.
The technical scheme is that:
A kind of 770MPa grade super strengths non-rapid solidifies aluminium alloy, it is characterised in that:This aluminium alloy mainly by aluminium (Al), Zinc (Zn), magnesium (Mg), copper (Cu), zirconium (Zr) and strontium (Sr) composition, wherein, the mass percent of zinc (Zn) is 8.8~9.4%, The mass percent of magnesium (Mg) is 2.75~2.85%, and the mass percent of copper (Cu) is 1.8~2.2%, the quality of zirconium (Zr) Percentage is 0.25~0.55%, and the mass percent of strontium (Sr) is 0~0.025%, and surplus is aluminium, and only guaranteed alloy The ratio of Zn and Mg mass percent meets 3≤Wt in elementZn/WtMg≤ 4, Mg mass percent WtMgSatisfaction 2%≤ WtMg≤ 3%, the main ZnMg hardening constituents in alloy could be caused to obtain maximum reinforcing effect.
A kind of preparation method of 770MPa grade super strengths non-rapid solidification aluminium alloy, it is characterized in that it includes successively:It is molten Casting-homogenizing anneal-hot extrusion-solution treatment-Ageing Treatment.
Described founding:Its process is according to composition design, weighs the addition of each raw material, wherein tri- kinds of elements of Cu, Zr, Sr Using Al-Cu, Al-Zr, Al-Sr intermediate alloy, Al, Zn, Mg use simple substance, and the particular order of melting is first will be load weighted Al, Zn, Al-Cu, Al-Zr, Al-Sr are placed in melting in smelting furnace, and smelting temperature is 900 DEG C, is used after this five kinds of melting sources Titanium alloy bar stirs, and stands 3min, adds carbon trichloride and argon gas refining degasification until being escaped without gas, in order to subtract Few scaling loss of the Mg in melting, is down to 800 DEG C by furnace temperature, adds Mg, and Mg is wrapped up with aluminium foil, in order to prevent Mg density It is low, swim on other liquid alloys, liquid alloy bottom is pressed into always with titanium alloy container, closed after standing insulation 5min with titanium Golden rod stirring, carbon trichloride and argon gas refining degasification are added until being escaped without gas, then furnace temperature is risen to 850 DEG C, insulation 10min, ingot of finally casting.
Described homogenizing anneal:It is characterized in that mechanism of anneal is 420 DEG C × 6h+440 DEG C × 6h+460 DEG C × 6h+465 DEG C × 12h, annealing terminal temperature is higher, can make it that the composition inside alloy is more uniform.
Described hot extrusion:It is characterized in that its technique is that the alloy after homogenizing anneal is heated into 480 DEG C and is incubated 8h It is 10 to carry out extrusion ratio afterwards:1 extruding, this moderate extrusion ratio can reduce the generation of alloy internal flaw.
Described solution treatment:It is characterized in that after Solid solution machine is made as 450 DEG C × 2h+460 DEG C × 2h+470 DEG C × 2h insulations Room temperature water quenching, water quenching transfer time are no more than 10s.
Described Ageing Treatment:It is characterized in that its technique is T6 timeliness, ageing mechanism is 121 DEG C × 24h.
770MPa grade super strengths non-rapid solidification aluminium alloy can be obtained.
Beneficial effects of the present invention:
(1) present invention obtains composition of a kind of 770MPa grade super strengths non-rapid solidification aluminium alloy and preparation method thereof Compared to disclosed patent, difference is obvious on composition, and composition section is more accurate, and clearly gives main in alloy Want the relation between alloying element content, more scientific and reasonable, especially melting, homogenizing anneal and hot extrusion work in technique The optimization of the composition design and technique of skill, more science improves the intensity of aluminium alloy jointly.And see that technique is bright on the whole It is aobvious to simplify, laid the first stone for industrialization.
(2) composition of 770MPa grade super strengths non-rapid solidification aluminium alloy that the present invention obtains and preparation method thereof, is closed Golden intensity is high, while elongation percentage remains to be maintained at more than 7%, and millimeter can only be manufactured with existing injection shaping flash set technology The block aluminium alloy of level is compared, and this technology can manufacture bigger high strength alumin ium alloy product, with more use value.
Embodiment
With reference to specific embodiment, the present invention is further illustrated.
Embodiment one
Prepare 770MPa grade super strengths non-rapid solidification aluminium alloy Al-9.01Zn-2.79Mg-2.14Cu-0.52Zr- 0.025Sr, WtZn/WtMg=3.23, and WtMg=2.79%, meet 3≤WtZn/WtMg≤ 4,2%≤WtMg≤ 3%, it is prepared Technique is as follows:
(1) founding:Designed according to mentioned component, weigh each raw material, the wherein addition of tri- kinds of elements of Cu, Zr, Sr uses Al- Cu, Al-Zr, Al-Sr intermediate alloy, Al, Zn, Mg use simple substance, the particular order of melting be first by load weighted Al, Zn, Al-Cu, Al-Zr, Al-Sr are placed in melting in smelting furnace, and smelting temperature is 900 DEG C, and titanium alloy is used after this five kinds of melting sources Rod stirs, and stands 3min, adds carbon trichloride and argon gas refining degasification until being escaped without gas, exists to reduce Mg Scaling loss during melting, furnace temperature is down to 800 DEG C, adds Mg, and Mg is wrapped up with aluminium foil, in order to prevent Mg density low, floating On other liquid alloys, liquid alloy bottom is pressed into always with titanium alloy container, is stirred after standing insulation 5min with titanium alloy bar Mix, add carbon trichloride and argon gas refining degasification until being escaped without gas, then furnace temperature is risen into 850 DEG C, be incubated 10min, Finally cast ingot.
(2) homogenizing anneal:The ingot casting that previous step is obtained carries out homogenizing anneal, and mechanism of anneal is 420 DEG C × 6h+ 440℃×6h+460℃×6h+465℃×12h。
(3) hot extrusion:It is 10 that alloy after homogenizing anneal is heated into 480 DEG C and extrusion ratio is carried out after being incubated 8h:1 Extruding, obtains extruded barses.
(4) solution treatment:The extruded barses that previous step is obtained carry out solution treatment, and Solid solution machine is made as 450 DEG C × 2h+ Room temperature water is quenched after 460 DEG C × 2h+470 DEG C × 2h insulations, and water quenching transfer time is no more than 10s.
(5) Ageing Treatment:Bar after solution treatment obtained in the previous step is subjected to T6 Ageing Treatments, ageing mechanism is 121℃×24h。
It is to obtain described aluminium alloy by above-mentioned steps, is tested by strength pull, measuring this strength of alloy is 770.1MPa, elongation percentage 8.2%.
Embodiment two
Prepare 770MPa grade super strengths non-rapid solidification aluminium alloy Al-9.34Zn-2.84Mg-2.17Cu-0.29Zr- 0.025Sr, WtZn/WtMg=3.29, and WtMg=2.84%, meet 3≤WtZn/WtMg≤ 4,2%≤WtMg≤ 3%, it is prepared Technique is identical with embodiment one, the aluminium alloy that the present embodiment obtains, is tested by strength pull, measuring maximum pulling strength is 780.8MPa, elongation percentage 7%.
Embodiment three
Prepare 770MPa grade super strengths non-rapid solidification aluminium alloy Al-8.89Zn-2.82Mg-1.85Cu-0.31Zr- 0.025Sr, WtZn/WtMg=3.15, and WtMg=2.82%, meet 3≤WtZn/WtMg≤ 4,2%≤WtMg≤ 3%, it is prepared Technique is identical with embodiment one, the aluminium alloy that the present embodiment obtains, is tested by strength pull, measuring tensile strength is 776.4MPa, elongation percentage 7.8%.
Those skilled in the art can suitably adjust the proportioning of each component according to examples detailed above and strictly by above-mentioned step Suddenly preferable 770MPa grade super strengths non-rapid solidification aluminium alloy and preparation method thereof can be obtained by carrying out manufacture.
Part that the present invention does not relate to is same as the prior art or can be realized using prior art.

Claims (4)

1. a kind of superhigh intensity non-rapid solidifies aluminium alloy, the tensile strength of the aluminium alloy is not less than 770Mpa, extended simultaneously Rate remains to be maintained at more than 7%, and the composition of the aluminium alloy is by aluminium (Al), zinc (Zn), magnesium (Mg), copper (Cu), zirconium (Zr) and strontium (Sr) form, it is characterised in that:The mass percent of zinc (Zn) is 8.8~9.4%, the mass percent of magnesium (Mg) for 2.75~ 2.85%, the mass percent of copper (Cu) is 1.8~2.2%, and the mass percent of zirconium (Zr) is 0.25~0.55%, strontium (Sr) Mass percent be 0~0.025%, surplus is aluminium, and the ratio of Zn and Mg mass percent should expire in alloying element 3≤Wt of footZn/WtMg≤ 4, Mg mass percent WtMg2%≤Wt should be metMg≤ 3%, the superhigh intensity non-rapid solidification The preparation process of aluminium alloy includes successively:Founding-homogenizing anneal-hot extrusion-solution treatment-Ageing Treatment;
Described founding, its process are:According to composition design, each raw material is weighed, the addition of wherein tri- kinds of elements of Cu, Zr, Sr makes With Al-Cu, Al-Zr, Al-Sr intermediate alloy, Al, Zn, Mg use simple substance, and the particular order of melting is first will be load weighted Al, Zn, Al-Cu, Al-Zr, Al-Sr are placed in melting in smelting furnace, and smelting temperature is 900 DEG C, is used after this five kinds of melting sources Titanium alloy bar stirs, and stands 3min, adds carbon trichloride and argon gas refining degasification until being escaped without gas, in order to subtract Few scaling loss of the Mg in melting, is down to 800 DEG C by furnace temperature, adds Mg, and Mg is wrapped up with aluminium foil, in order to prevent Mg density It is low, swim on other liquid alloys, Mg is pressed into liquid alloy bottom always with titanium alloy container, used after standing insulation 5min Titanium alloy bar stirs, and adds carbon trichloride and argon gas refining degasification until being escaped without gas, then furnace temperature is risen into 850 DEG C, It is incubated 10min, ingot of finally casting;
Described homogenizing anneal:Mechanism of anneal is 420 DEG C × 6h+440 DEG C × 6h+460 DEG C × 6h+465 DEG C × 12h;
Described hot extrusion, its technique are:Alloy after homogenizing anneal is heated to 480 DEG C and carries out extrusion ratio after being incubated 8h For 10:1 extruding.
2. a kind of preparation method of superhigh intensity non-rapid solidification aluminium alloy as claimed in claim 1, step include successively:It is molten Casting-homogenizing anneal-hot extrusion-solution treatment-Ageing Treatment, it is characterized in that,
Described founding, its process are:According to composition design, each raw material is weighed, the addition of wherein tri- kinds of elements of Cu, Zr, Sr makes With Al-Cu, Al-Zr, Al-Sr intermediate alloy, Al, Zn, Mg use simple substance, and the particular order of melting is first will be load weighted Al, Zn, Al-Cu, Al-Zr, Al-Sr are placed in melting in smelting furnace, and smelting temperature is 900 DEG C, is used after this five kinds of melting sources Titanium alloy bar stirs, and stands 3min, adds carbon trichloride and argon gas refining degasification until being escaped without gas, in order to subtract Few scaling loss of the Mg in melting, is down to 800 DEG C by furnace temperature, adds Mg, and Mg is wrapped up with aluminium foil, in order to prevent Mg density It is low, swim on other liquid alloys, Mg is pressed into liquid alloy bottom always with titanium alloy container, used after standing insulation 5min Titanium alloy bar stirs, and adds carbon trichloride and argon gas refining degasification until being escaped without gas, then furnace temperature is risen into 850 DEG C, It is incubated 10min, ingot of finally casting;
Described homogenizing anneal:Mechanism of anneal is 420 DEG C × 6h+440 DEG C × 6h+460 DEG C × 6h+465 DEG C × 12h;
Described hot extrusion, its technique are:Alloy after homogenizing anneal is heated to 480 DEG C and carries out extrusion ratio after being incubated 8h For 10:1 extruding.
3. a kind of preparation method of superhigh intensity non-rapid solidification aluminium alloy as claimed in claim 2, it is characterized in that:Described Solution treatment, room temperature water is quenched after Solid solution machine is made as 450 DEG C × 2h+460 DEG C × 2h+470 DEG C × 2h insulations, and water quenching transfer time is not More than 10s.
4. a kind of preparation method of superhigh intensity non-rapid solidification aluminium alloy as claimed in claim 2, it is characterized in that:Described Ageing Treatment, it is characterized in that its technique is T6 timeliness, ageing mechanism is 121 DEG C × 24h.
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CN110592444A (en) * 2019-08-27 2019-12-20 江苏大学 700-doped 720 MPa-strength heat-resistant high-intergranular corrosion-resistant aluminum alloy and preparation method thereof
CN111101032A (en) * 2019-12-18 2020-05-05 山东南山铝业股份有限公司 High-strength and high-plasticity extruded aluminum alloy and preparation method thereof

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