CN106868367B - A kind of magnesium alloy and its structural strength Enhancement Method - Google Patents
A kind of magnesium alloy and its structural strength Enhancement Method Download PDFInfo
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- CN106868367B CN106868367B CN201710146423.8A CN201710146423A CN106868367B CN 106868367 B CN106868367 B CN 106868367B CN 201710146423 A CN201710146423 A CN 201710146423A CN 106868367 B CN106868367 B CN 106868367B
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- magnesium alloy
- structural strength
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- liquid phase
- rare earth
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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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
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
Abstract
The invention discloses a kind of magnesium alloy and its structural strength Enhancement Method, magnesium alloy is prepared by Al, Zn, Ca, rare earth element, Mg；Structural strength Enhancement Method：By crucible furnace preheating insulation; raw material magnesium alloy simple substance and protecting flux is added; it is passed through protective gas simultaneously; by crucible furnace heat temperature raising; raw material magnesium alloy simple substance is set to be completely melt; the protecting flux for filtering out liquid phase surface flotation makes crucible furnace continue to heat up and refines, and obtains the magnesium alloy liquid melt of surface-brightening；Magnesium carbonate fine grained is added in magnesium alloy liquid melt and is kept the temperature, continues that crucible furnace temperature is made to increase, forms bright liquid phase；Bright liquid phase is quickly cooled down and is cast in sand mold, water quenching cooling, the magnesium alloy enhanced to get structural strength through subsequently forging working process are carried out.The Structure of magnesium alloy intensity enhancing method control method that the present invention uses is clear, and technological process specification, product quality is stablized, and output works well, and the scope of application is wide.
Description
Technical field
The present invention relates to magnesium base alloy fields, and in particular to a kind of magnesium alloy and its structural strength Enhancement Method.
Background technology
Magnesium alloy is that based on magnesium elements and the alloy material that other elements form is added, small, corrosion-resistant with density,
Numerous excellent reasons such as deformation rigidity is big, structural strength is high, elasticity modulus is big, perfect heat-dissipating, carrying blastic deformation ability are strong
Change characteristic and mechanical characteristics.It is the most widely used at present to surely belong to magnesium alloy, it is secondly magnesium-manganese alloy and magnesium-zinc alloy etc.,
Due to having the characteristics that light weight intensity is high, magnesium alloy is widely used in aerospace technique, automobile industry, medication chemistry
The industry manufacture fields such as industry.
There are mainly three types of the mode classifications of magnesium alloy：From comprising five kinds of aluminium, manganese, zinc, zirconium and rare earth element etc. it is main
Element for element and chemically ingredient distinguishes, cast magnesium alloy and deformed Mg can be then divided into from process for machining and manufacturing and is closed
The two major classes such as gold.And a method of magnesium alloy whether is also to discriminate between containing zr element.Different chemical elements and ingredient contain
Amount has opposite impacts on the performance and processing method of magnesium alloy, and aluminium, manganese, zinc and rare earth element close enhancing magnesium
The corrosion resisting property and raising mechanical property of gold have positive facilitation.
When carrying out magnesium alloy cast using smelting process, since the chemical binding force of magnesium elements and oxygen element is very strong so that molten
Magnesium after change is easily oxidized and violent chemical reaction occurs.It must be taken when therefore using casting melting magnesium alloy anti-
The responsible measures of block and burning.
Chinese patent CN201410402527.7 discloses a kind of high-strength magnesium alloy, which is existed using the method for founding
Tungsten-titanium alloy is added in magnesium alloy to improve the structure property of magnesium alloy.But the tungsten-titanium alloy that uses of the patent due to than
Great, refining difficulty height counteracts the outstanding advantage of magnesium alloy.
Therefore, it for the disadvantage of the intensity deficiency of casting magnesium alloy, needs to invent a kind of raising Structure of magnesium alloy intensity
Method.
Invention content
The present invention is in view of the above-mentioned problems, provide a kind of magnesium alloy and its structural strength Enhancement Method.
Technical solution is used by the present invention solves the above problems：A kind of magnesium alloy, by the original of following mass percents
Material is prepared：Al 5.4%~9.5%, Zn 0.56%~4.35%, Ca 0.27%~0.83%, rare earth element 0.1%
~0.4%, remaining is Mg.
Further, rare earth element is prepared by the raw material of following mass percents：25%~45%Nd, 25%~
35%Ce, 12%~18%Y, 8%~12%La, 5%~10%Sc, 3%~5%Sm.
Another goal of the invention of the present invention, is to provide a kind of structural strength Enhancement Method of above-mentioned magnesium alloy, including with
Lower step：
Step S1, melting：Crucible furnace is preheated to 250 DEG C~300 DEG C, 2h~4h is kept the temperature, the mass percent is added
Al, Zn, Ca, rare earth element, Mg simple substance, protecting flux is added, while being passed through protective gas, crucible furnace is heated to
550 DEG C~650 DEG C, Al, Zn, Ca, rare earth element, Mg is made to be completely melt, filters out the protecting flux of liquid phase surface flotation, make crucible
Stove is continuously heating to 700 DEG C~720 DEG C refining 15min~30min, obtains the magnesium alloy liquid melt of surface-brightening；
Step S2, crystallization：Magnesium carbonate fine grained is added to the magnesium that step S1 is obtained when temperature is 700 DEG C~720 DEG C
It in alloy liquid melt, stirs evenly, keeps the temperature 20min~25min, continue that crucible furnace temperature is made to be increased to 780 DEG C~850 DEG C,
5min~30min is kept the temperature, bright liquid phase is formed；
Step S3, casting：The bright liquid phase that step S2 is obtained is quickly cooled to 570 DEG C~600 DEG C, with 0.5m/s~
The speed of 5m/s is cast in sand mold, and water quenching cooling is carried out using 50 DEG C~70 DEG C of liquid phase waters, through subsequently forging working process,
Up to the magnesium alloy of structural strength enhancing.
Further, in step S1, protecting flux is mixed by the raw material of following mass percents：NaCl 10%~
15%, H3BO310%~15%, KCl 35%~40%, MgCl235%~40%.
Further, in step S1, protective gas is：N220%~30%, SF65%~10%, remaining is indifferent gas
Body.
Further, in step S2, the fine grain quality of magnesium carbonate is：Al, Zn, Ca, rare earth element, Mg simple substance gross masses
1%~2%.
Further, in step S2, the raised heating rate of crucible furnace temperature is：20 DEG C/min~30 DEG C/min.
Further, in step S3, the cooling rate of water quenching cooling is：50 DEG C/min~70 DEG C/min.
Further, in step S3, the yield strength of the magnesium alloy of structural strength enhancing is 210MPa~250MPa, tension
Intensity is 350MPa~400MPa.
It is an advantage of the invention that：
1. the present invention contains mixed rare-earth elements ingredient in group of magnesium alloys in, the grain structure of magnesium alloy can be made thin
Change, improve heat resistance, reduce loose and hot tearing, improves casting character and machining property, significantly improve structural strength, entirely
Improve the comprehensive performance of magnesium alloy in face；
2. improving magnesium alloy using the fuse salt containing boric acid and hybrid protection gas in the Enhancement Method of the present invention to melt
The processing safety of refining, at the same when melting using small grains as nucleating center promote Structure of magnesium alloy tissue reach full growth and
Growth, improves the crystal grain uniformity of magnesium alloy from microcosmic point, is conducive to improve magnesium alloy strength；
3. the Enhancement Method control method of the present invention is clear, technological process specification, product quality is stablized, and output effect is good
Good, the scope of application is wide.
Specific implementation mode
The embodiment of the present invention is described in detail below, but what the present invention can be defined by the claims and cover
Multitude of different ways is implemented.
Embodiment 1
A kind of magnesium alloy is prepared by the raw material of following mass percents：Al 5.4%, Zn 0.56%, Ca
0.27%, rare earth element 0.1%, remaining is Mg.
Further, rare earth element is prepared by the raw material of following mass percents：25%Nd, 35%Ce, 18%Y,
12%La, 5%Sc, 5%Sm.
Embodiment 2
A kind of magnesium alloy is prepared by the raw material of following mass percents：Al 9.5%, Zn 4.35%, Ca
0.83%, rare earth element 0.4%, remaining is Mg.
Further, rare earth element is prepared by the raw material of following mass percents：45%Nd, 25%Ce, 12%Y,
8%La, 7%Sc, 3%Sm.
Embodiment 3
A kind of magnesium alloy is prepared by the raw material of following mass percents：Al 7.5%, Zn 2.5%, Ca
0.55%, rare earth element 0.25%, remaining is Mg.
Further, rare earth element is prepared by the raw material of following mass percents：35%Nd, 30%Ce, 13%Y,
8%La, 10%Sc, 4%Sm.
Embodiment 4
A kind of structural strength Enhancement Method of magnesium alloy, includes the following steps：
Step S1, melting：Crucible furnace is preheated to 250 DEG C, keeps the temperature 2h, be added Al, Zn of the mass percent, Ca,
Rare earth element, Mg simple substance are added protecting flux, while being passed through protective gas, crucible furnace is heated to 550 DEG C, make Al,
Zn, Ca, rare earth element, Mg are completely melt, filter out the protecting flux of liquid phase surface flotation, and crucible furnace is made to be continuously heating to 700 DEG C
15min is refined, the magnesium alloy liquid melt of surface-brightening is obtained；Wherein, protecting flux is mixed by the raw material of following mass percents
It closes：NaCl 10%, H3BO315%, KCl 35%, MgCl240%；Protective gas is：N220%, SF65%, remaining
For inert gas.
Step S2, crystallization：Magnesium carbonate fine grained is added to the magnesium alloy liquid that step S1 is obtained when temperature is 700 DEG C
It in melt, stirs evenly, keeps the temperature 20min, continue that crucible furnace temperature is made to be increased to 780 DEG C with the heating rate of 20 DEG C/min, protect
Warm 5min forms bright liquid phase；Wherein, the fine grain quality of magnesium carbonate is：Al, Zn, Ca, rare earth element, Mg simple substance gross masses
1%；
Step S3, casting：The bright liquid phase that step S2 is obtained is quickly cooled to 570 DEG C, is cast with the speed of 0.5m/s
Into sand mold, water quenching cooling, the magnesium enhanced to get structural strength through subsequently forging working process are carried out using 50 DEG C of liquid phase waters
Alloy；Wherein, the cooling rate of water quenching cooling is：50℃/min.
Mechanics Performance Testing, test are carried out according to ASTM B94 to the magnesium alloy that structural strength made from the present embodiment enhances
As a result it is：
Embodiment 5
A kind of structural strength Enhancement Method of magnesium alloy, includes the following steps：
Step S1, melting：Crucible furnace is preheated to 300 DEG C, keeps the temperature 4h, be added Al, Zn of the mass percent, Ca,
Rare earth element, Mg simple substance are added protecting flux, while being passed through protective gas, crucible furnace is heated to 650 DEG C, make Al,
Zn, Ca, rare earth element, Mg are completely melt, filter out the protecting flux of liquid phase surface flotation, and crucible furnace is made to be continuously heating to 720 DEG C
30min is refined, the magnesium alloy liquid melt of surface-brightening is obtained；Wherein, protecting flux is mixed by the raw material of following mass percents
It closes：NaCl 15%, H3BO310%, KCl 40%, MgCl235%；Protective gas is：N230%, SF610%,
Remaining is inert gas.
Step S2, crystallization：Magnesium carbonate fine grained is added to the magnesium alloy liquid that step S1 is obtained when temperature is 720 DEG C
It in melt, stirs evenly, keeps the temperature 25min, continue that crucible furnace temperature is made to be increased to 850 DEG C with the heating rate of 30 DEG C/min, protect
Warm 30min forms bright liquid phase；Wherein, the fine grain quality of magnesium carbonate is：Al, Zn, Ca, rare earth element, Mg simple substance gross masses
2%；
Step S3, casting：The bright liquid phase that step S2 is obtained is quickly cooled to 600 DEG C, is cast to the speed of 5m/s
In sand mold, water quenching cooling is carried out using 70 DEG C of liquid phase waters, is closed to get the magnesium that structural strength enhances through subsequently forging working process
Gold；Wherein, the cooling rate of water quenching cooling is：70℃/min.
Mechanics Performance Testing, test are carried out according to ASTM B94 to the magnesium alloy that structural strength made from the present embodiment enhances
As a result it is：
Embodiment 6
A kind of structural strength Enhancement Method of magnesium alloy, includes the following steps：
Step S1, melting：Crucible furnace is preheated to 280 DEG C, keeps the temperature 3h, be added Al, Zn of the mass percent, Ca,
Rare earth element, Mg simple substance are added protecting flux, while being passed through protective gas, crucible furnace is heated to 600 DEG C, make Al,
Zn, Ca, rare earth element, Mg are completely melt, filter out the protecting flux of liquid phase surface flotation, and crucible furnace is made to be continuously heating to 710 DEG C
22min is refined, the magnesium alloy liquid melt of surface-brightening is obtained；Wherein, protecting flux is mixed by the raw material of following mass percents
It closes：NaCl 12%, H3BO313%, KCl 38%, MgCl237%；Protective gas is：N225%, SF68%, remaining
For inert gas.
Step S2, crystallization：Magnesium carbonate fine grained is added to the magnesium alloy liquid that step S1 is obtained when temperature is 710 DEG C
It in melt, stirs evenly, keeps the temperature 22min, continue that crucible furnace temperature is made to be increased to 810 DEG C with the heating rate of 25 DEG C/min, protect
Warm 22min forms bright liquid phase；Wherein, the fine grain quality of magnesium carbonate is：Al, Zn, Ca, rare earth element, Mg simple substance gross masses
1.5%；
Step S3, casting：The bright liquid phase that step S2 is obtained is quickly cooled to 585 DEG C, is cast with the speed of 2.7m/s
Into sand mold, water quenching cooling, the magnesium enhanced to get structural strength through subsequently forging working process are carried out using 60 DEG C of liquid phase waters
Alloy；Wherein, the cooling rate of water quenching cooling is：60℃/min.
Mechanics Performance Testing, test are carried out according to ASTM B94 to the magnesium alloy that structural strength made from the present embodiment enhances
As a result it is：
It these are only the preferred embodiment of the present invention, be not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.Any modification made by all within the spirits and principles of the present invention,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of structural strength Enhancement Method of magnesium alloy, which is characterized in that include the following steps：
Step S1, melting：Preparation prepares the raw material of magnesium alloy, the magnesium alloy prepared by the raw material of following mass percents and
At：Al 7.5%~9.5%, Zn 2.5%~4.35%, Ca 0.55%~0.83%, rare earth element 0.1%%, remaining is
Mg；The rare earth element is prepared by the raw material of following mass percents：25%~45%Nd, 25%~35%Ce, 12%
~18%Y, 8%~12%La, 5%~10%Sc, 3%~5%Sm；Crucible furnace is preheated to 250 DEG C~300 DEG C, keeps the temperature 2h
Al, Zn, Ca, rare earth element, the Mg simple substance of the mass percent is added in~4h, protecting flux is added, while being passed through protection gas
Crucible furnace is heated to 550 DEG C~650 DEG C, so that Al, Zn, Ca, rare earth element, Mg is completely melt, filter out liquid phase surface by body
The protecting flux of floating makes crucible furnace be continuously heating to 700 DEG C~720 DEG C refining 15min~30min, obtains surface-brightening
Magnesium alloy liquid melt；The protecting flux is mixed by the raw material of following mass percents：NaCl 10%~15%,
H3BO310%~15%, KCl 35%~40%, MgCl235%~40%；The protective gas is：N220%~30%,
SF65%~10%, remaining is inert gas；
Step S2, crystallization：Magnesium carbonate fine grained is added to the magnesium alloy that step S1 is obtained when temperature is 700 DEG C~720 DEG C
It in liquid melts, stirs evenly, keeps the temperature 20min~25min, continue that crucible furnace temperature is made to be increased to 780 DEG C~850 DEG C, heat preservation
5min~30min forms bright liquid phase；
Step S3, casting：The bright liquid phase that step S2 is obtained is quickly cooled to 570 DEG C~600 DEG C, with 0.5m/s~5m/s's
Speed is cast in sand mold, water quenching cooling is carried out using 50 DEG C~70 DEG C of liquid phase waters, through subsequently forging working process to get knot
The strengthened magnesium alloy of structure.
2. structural strength Enhancement Method according to claim 1, which is characterized in that in step S2, thin of the magnesium carbonate
Grain quality be：The 1%~2% of Al, Zn, Ca, rare earth element, Mg simple substance gross masses.
3. structural strength Enhancement Method according to claim 1, which is characterized in that in step S2, the crucible furnace temperature
Raised heating rate is：20 DEG C/min~30 DEG C/min.
4. structural strength Enhancement Method according to claim 1, which is characterized in that in step S3, the water quenching cooling
Cooling rate is：50 DEG C/min~70 DEG C/min.
5. structural strength Enhancement Method according to claim 1, which is characterized in that in step S3, the structural strength increases
The yield strength of strong magnesium alloy is 210MPa~250MPa, and tensile strength is 350MPa~400MPa.
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| CN106868367B true CN106868367B (en) | 2018-08-07 |
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| KR102210236B1 (en) * | 2018-12-14 | 2021-02-01 | 울산과학기술원 | Magnesium alloy materials and method for producing the same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1431329A (en) * | 2003-01-28 | 2003-07-23 | 东南大学 | Heat-resistant rare earth magnesium alloy |
| CN102534311A (en) * | 2011-12-20 | 2012-07-04 | 暨南大学 | Aluminium calcium carbon grain refiner for Mg-Al series magnesium alloy and preparation method and application thereof |
| KR20130012662A (en) * | 2011-07-26 | 2013-02-05 | 한국기계연구원 | High-strength high-ductility ignition-proof magnesium alloy |
| CN103469039A (en) * | 2013-09-02 | 2013-12-25 | 重庆大学 | Magnesium-aluminum-zinc wrought magnesium alloy containing calcium and rare-earth samarium |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5590660B2 (en) * | 2010-03-01 | 2014-09-17 | 独立行政法人産業技術総合研究所 | Magnesium alloy sheet with improved cold formability and in-plane anisotropy and method for producing the same |
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- 2017-03-13 CN CN201710146423.8A patent/CN106868367B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1431329A (en) * | 2003-01-28 | 2003-07-23 | 东南大学 | Heat-resistant rare earth magnesium alloy |
| KR20130012662A (en) * | 2011-07-26 | 2013-02-05 | 한국기계연구원 | High-strength high-ductility ignition-proof magnesium alloy |
| CN102534311A (en) * | 2011-12-20 | 2012-07-04 | 暨南大学 | Aluminium calcium carbon grain refiner for Mg-Al series magnesium alloy and preparation method and application thereof |
| CN103469039A (en) * | 2013-09-02 | 2013-12-25 | 重庆大学 | Magnesium-aluminum-zinc wrought magnesium alloy containing calcium and rare-earth samarium |
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Effective date of registration: 20221107 Address after: 323010 No. 553, Xiushan Road, Liandu District, Lishui City, Zhejiang Province Patentee after: Zhejiang Core Microelectronics Co.,Ltd. Address before: 325000 No. 1 Incubator Building, Science Park, Wenzhou National University, No. 38 Dongfangnan Road, Ouhai Economic Development Zone, Wenzhou City, Zhejiang Province Patentee before: ZHEJIANG INDUSTRY & TRADE VACATIONAL College |