CN104294131B - Mg-Zn-Cr-Bi-Zr alloy age-hardenable and preparation method thereof - Google Patents

Mg-Zn-Cr-Bi-Zr alloy age-hardenable and preparation method thereof Download PDF

Info

Publication number
CN104294131B
CN104294131B CN201410522382.4A CN201410522382A CN104294131B CN 104294131 B CN104294131 B CN 104294131B CN 201410522382 A CN201410522382 A CN 201410522382A CN 104294131 B CN104294131 B CN 104294131B
Authority
CN
China
Prior art keywords
alloy
metal
crucible
age
mgzr30
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201410522382.4A
Other languages
Chinese (zh)
Other versions
CN104294131A (en
Inventor
叶杰
林小娉
董允
杨会光
樊志斌
付守军
吴厚卜
尹世攀
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Northeastern University China
Original Assignee
Northeastern University China
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Northeastern University China filed Critical Northeastern University China
Priority to CN201410522382.4A priority Critical patent/CN104294131B/en
Publication of CN104294131A publication Critical patent/CN104294131A/en
Application granted granted Critical
Publication of CN104294131B publication Critical patent/CN104294131B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • C22C23/04—Alloys based on magnesium with zinc or cadmium as the next major constituent
    • 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
    • C22C1/03—Making non-ferrous alloys by melting using master alloys
    • 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

Landscapes

  • 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)
  • Conductive Materials (AREA)

Abstract

The invention discloses a kind of Mg Zn Cr Bi Zr alloy age-hardenable and preparation method thereof, the mass percent of described alloy compositions is: Zn 4%～10%, Cr 0.1%～0.5%, Bi 0.1%～1.0%, Zr 0.3%～0.5%, and surplus is Mg；The method preparing described alloy includes: is preheated by the alloy furnace charge prepared, and is passed through CO2/SF6Mixed gas as protection gas carry out melting; the Mg Zn Cr Bi Zr cast alloy material diffusion annealing 48h at 380 DEG C that will obtain, then line cuts to obtain aging strengthening model sample and plate type tensile specimen, to said sample solid solution; timeliness 0～400 hours at 160 DEG C, to obtain final product again.The present invention can prepare that as-cast structure is relatively thin, have preferable age-hardening effect, heat stability and mechanical property, and the Mg Zn Cr Bi Zr cast magnesium alloy of low cost.

Description

Mg-Zn-Cr-Bi-Zr alloy age-hardenable and preparation method thereof
Technical field
The present invention relates to a kind of Mg-Zn-Cr-Bi-Zr alloy age-hardenable and preparation method thereof, belong to metal material Field of engineering technology.
Background technology
Magnesium alloy is structural metallic materials the lightest in current practice, has the specific strength of excellence, specific stiffness, damping Property, heat conductivity, machinable and recuperability, have become as the metal material having most development potentiality, be referred to as 21 century " green engineering material ", receive the attention of many countries.But, magnesium alloy is due to the problems such as intensity is relatively low, plasticity is poor, limit Make its further application industrially.Therefore, the emphasis that magnesium alloy mechanical property is the research and development of magnesium alloy technical field is improved.
Mg-Zn system alloy is the important foundation of practical magnesium alloy, and its solid solution exists metastable miscibility gap, has substantially Solution strengthening and aging hardening effect, attracted a large amount of researcher concern to its timeliness Temperature measurement both at home and abroad.But, single Pure Mg-Zn bianry alloy exist bigger hot shrinkage sensitivity, casting flaw is relatively big, be difficult to welding, Precipitation tissue slightly Big and skewness and the shortcoming such as hardening constituent heat stability is poor, greatly limit Mg-Zn bianry alloy raw in actual industrial Application in product.Therefore, by adding a certain amount of alloying element in Mg-Zn bianry alloy and being obtained by Technology for Heating Processing Composition uniformly, fine microstructures, excellent performance and the good magnesium alloy of comprehensive mechanical property become the important research of field of magnesium alloy Direction.
For solving the problems referred to above, technical staff attempts adding alloying element in Mg-Zn alloy, such as: patent CN 102071345 A disclose a kind of Mg-Zn-Cu-Zr magnesium alloy, and its chemical composition is (wt.%): Zn6%, Cu0.5～ 1.0%, Zr0.3～0.8%, surplus is Mg, after abundant fixation rates, the maximum tensile strength of alloy, yield strength, Elongation percentage respectively reaches 240～270MPa, 160～190MPa and 11～17%；Patent CN 101407880 A discloses one Mg-Zn-Zr-Nd cast magnesium alloy, its chemical composition is (wt.%): Zn4.0～6.0%, Zr0.2～0.8%, Nd0.3～ 1.5%, surplus is magnesium, the maximum tensile strength of alloy, elongation percentage, hardness respectively reach 255～322MPa, 9.82～ 15.82%, 62～91HRB.
Said method is also problematic: although adding Cu and Zr in Mg-Zn alloy can increase alloy aging hardening phase Precipitation quantity and thinning microstructure, but for suppression age-hardening phase fast growth, extend alloy overaging effect not Preferable；The interpolation of Nd adds again the cost of alloy.
Summary of the invention
It is an object of the invention to, it is provided that a kind of Mg-Zn-Cr-Bi-Zr alloy age-hardenable and preparation method thereof, Add Cr-Bi element and the alloy preparation technology of optimization by compound in Mg-Zn-Zr alloy, prepare as-cast structure phase To relatively thin, there is preferable age-hardening effect, heat stability and mechanical property, and the Mg-Zn-Cr-Bi-Zr casting of low cost Magnesium alloy.
For solving above-mentioned technical problem, the present invention adopts the following technical scheme that: a kind of Mg-Zn-Cr-age-hardenable Bi-Zr alloy, the mass percent of its each component is: Zn4%～10%, Cr0.1%～0.5%, Bi0.3%～1.0%, Zr0.3%～0.5%, surplus is Mg, gross mass 100%.
Preferably, the mass percent of aforementioned alloy compositions is: Zn5.5%, Cr0.2%, Bi0.5%, Zr0.3%, remaining Amount is Mg.
A kind of method preparing aforementioned Mg-Zn-Cr-Bi-Zr alloy age-hardenable, comprises the following steps:
S1, employing magnesium ingot, zinc ingot metal, metal Cr, metal Bi and MgZr30 intermediate alloy are as raw material, according to each group of alloy Distribution ratio calculates the mass percent needed for raw material；
S2, puts in crucible electrical resistance furnace after described raw material is carried out prewarming baking at 200 DEG C；
S3, is set as 740～760 DEG C by the heating-up temperature of crucible electrical resistance furnace, when crucible temperature rises to 350～400 DEG C, In crucible, first add magnesium ingot, zinc ingot metal, metal Cr and MgZr30 intermediate alloy, be passed through CO2/SF6Mixed gas as protection Gas；Continue to heat up, after the magnesium ingot in crucible, zinc ingot metal, metal Cr and MgZr30 intermediate alloy are completely melt, add metal Bi；Stir 2～5 minutes after furnace charge is completely melt, be incubated 25～30 minutes at 740～760 DEG C, remove molten surface scum silica frost, Mg-Zn-Cr-Bi-Zr alloying metal liquid is poured in metal mold, obtains Mg-Zn-Cr-Bi-Zr cast alloy material；
S4, is placed in Mg-Zn-Cr-Bi-Zr cast alloy material in vacuum heat treatment furnace, diffusion annealing at 380 DEG C 48h, cools to room temperature with the furnace, then line cuts into aging strengthening model sample and plate type tensile specimen；
S5, aging strengthening model sample step S4 obtained and plate type tensile specimen are in 360～380 DEG C of solid solutions 16～24 Hour, then timeliness 0～400 hours at 160 DEG C, obtain Mg-Zn-Cr-Bi-Zr age-hardening magnesium alloy.
Preferably, the preparation method of aforementioned Mg-Zn-Cr-Bi-Zr alloy age-hardenable, comprise the following steps:
S1, use magnesium ingot Mg, zinc ingot metal, metal Cr, metal Bi and MgZr30 intermediate alloy as raw material, each according to alloy Component proportion calculates the mass percent needed for raw material；
S2, puts in crucible electrical resistance furnace after described raw material is carried out prewarming baking at 200 DEG C；
S3, is set as 760 DEG C by the heating-up temperature of crucible electrical resistance furnace, when crucible temperature rises to 400 DEG C, first in crucible Add magnesium ingot, zinc ingot metal, metal Cr and MgZr30 intermediate alloy, be passed through 0.1%SF6-99.9%CO2(volume fraction) mixed gas As protection gas；Continue to heat up, after the magnesium ingot in crucible, zinc ingot metal, metal Cr and MgZr30 intermediate alloy are completely melt, then add Enter metal Bi；Stir 3 minutes after furnace charge is completely melt, be incubated 30 minutes at 750 DEG C, remove molten surface scum silica frost, by Mg- Zn-Cr-Bi-Zr alloying metal liquid is poured in the metal mold of a diameter of 30mm, obtains Mg-Zn-Cr-Bi-Zr cast alloy material Material；
S4, is placed in Mg-Zn-Cr-Bi-Zr cast alloy material in vacuum heat treatment furnace, diffusion annealing at 380 DEG C 48h, cools to room temperature with the furnace, then line cuts into diameter 10mm, the aging strengthening model sample of length 15mm and tabular stretching examination Sample；
S5, aging strengthening model sample step S4 obtained and plate type tensile specimen were 360 DEG C of solid solutions 16 hours, then Timeliness 0～400 hours at 160 DEG C, obtain Mg-Zn-Cr-Bi-Zr age-hardening magnesium alloy.
In abovementioned steps S1, because being Mg base alloy, Mg is using magnesium ingot as raw material；Zn is major alloy, pure Metal can guarantee that the accuracy of alloying component, can also avoid being mixed into of objectionable impurities simultaneously；Zr is with Mg-Zr intermediate alloy MgZr30 adds as raw material；Owing to there is no Mg-Cr intermediate alloy, therefore select metal Cr as raw material；The fusing point of Bi is relatively Low, therefore select metal Bi as raw material.Further, the purity of magnesium ingot, zinc ingot metal, metal Cr and metal Bi is 99.9%.
In abovementioned steps S3, the addition sequence of each raw material mainly according to raw-material fusing point height and addition number Depending on.Because Mg, Zn are main adding elements, and the fusing point of Cr is slightly higher, so during shove charge, being initially charged magnesium ingot, zinc ingot metal, metal Cr With MgZr30 intermediate alloy；The fusing point of Bi is relatively low, thus etc. above-mentioned load melting after add Bi, to ensure that alloying element is minimum Scaling loss and accurately chemical Composition Control.
In abovementioned steps S3, melting is passed through SF6With CO2The purpose of mixed gas is in Serum Magnesium Surface Creation one layer cause Close protecting film, thus the oxygen intercepted in air reacts with magnesium molten metal, protects Serum Magnesium.That wherein play a major role is SF6, But SF6Concentration too low or too high time, protective gas does not the most possess protective action, if this is because SF6Concentration is too small, then formed MgF2Amount is few, and surface protection film is the finest and close；If SF6Concentration is excessive, then the MgF formed2Too much, protecting film becomes thick and crisp to amount, holds Easily fragmentation, reduces protective effect, goes back heavy corrosion smelting furnace, general SF simultaneously6Concentration control in 0.1% (volume fraction) left The right side is optimal.
In abovementioned steps S3, generally use permanent mold casting, because metal mold rate of cooling is relatively big, can ensure that alloy casting state Fine microstructures.
In abovementioned steps S4, diffusion annealing is that (dendrite is inclined in order to eliminate the microsegregation that ingot casting produces in process of setting Analysis, microsegregation and cyrystal boundary segregation), make homogenization of composition.
In abovementioned steps S5, first determine solid solubility temperature scope 360～380 DEG C according to phasor, then do reality every 30 DEG C Test, determine optimal solid solution temperature and time according to solid solution structure；Under same solid solubility temperature, carry out 12,24 respectively, 48h solid solution, finally determines solid solution treatment process.
Compared with prior art, the invention have the advantages that
1, Zr is a kind of effective grain refining element in without the magnesium alloy of Al, and it can improve the even tissue of alloy Property, reduce the volume fraction of eutectic structure on crystal boundary, make more solute Zn participate in solid solution aging and separate out, carry heavy alloyed by force Degree, the size of precipitated phase during Zr also can refine deformation Mg-Zn system alloy in addition, and β can be stablized1The precipitation of ' phase improve that it is long/ Footpath ratio, thus improve the inhibition of dislocation basal slip.
2, compound interpolation Cr-Bi element in Mg-Zn-Zr alloy, can improve heat stability and the power of cast magnesium alloy Learn performance.Cr can increase the forming core speed in alloy aging initial stage tissue, promotes that hardening constituent must be formed；Bi is surface activity unit Element, can be with the Bi of Mg formation hexagonal structure2Mg3Phase, the formation free energy of this phase is less than shaft-like hardening constituent, in ag(e)ing process first Separate out in hardening constituent, thus promote hardening constituent forming core further and suppress it to grow up, make alloy have preferable heat stability.And Being also demonstrated that by test, the Mg-Zn-Cr-Bi-Zr alloy of the present invention is after aging strengthening model, and its mechanical property is better than other Mg- Zn system alloy.
Accompanying drawing explanation
Fig. 1 is the age hardening curves of the Mg-5.5Zn-0.2Cr-0.5Bi-0.3Zr alloy that the embodiment of the present invention 1 obtains Figure；
Fig. 2 is that the Mg-5.5Zn-0.2Cr-0.5Bi-0.3Zr alloy that obtains of the embodiment of the present invention 1 is through linear cutter system Standby tensile sample scale diagrams.
The present invention is further illustrated with detailed description of the invention below in conjunction with the accompanying drawings.
Detailed description of the invention
Embodiment 1:
A kind of Mg-Zn-Cr-Bi-Zr alloy age-hardenable, its each component and mass percent be: Zn:5.5%, Cr:0.2%, Bi:0.5%, Zr:0.3%, surplus is Mg, gross mass 100%.
Its preparation method is as follows:
1, calculate with melt quality percent, weigh magnesium ingot (purity is 99.9%) 94%, zinc ingot metal (purity is 99.9%) 6%, metal Cr (purity is 99.9%) 0.21%, metal Bi (purity is 99.9%) 0.55%, Mg-Zr intermediate alloy MgZr30 (containing 30%Zr) 1.05%；
2, put in crucible electrical resistance furnace after the metal charge weighed up being carried out prewarming baking at 200 DEG C；
3, the heating-up temperature of crucible electrical resistance furnace is set as 760 DEG C, when crucible temperature rises to 400 DEG C, first in crucible Add magnesium ingot, zinc ingot metal, metal Cr and MgZr30 intermediate alloy, be passed through 0.1%SF6-99.9%CO2Mixed gas as protection Gas；Continue to heat up, after the magnesium ingot in crucible, zinc ingot metal, metal Cr and MgZr30 intermediate alloy are completely melt, add metal Bi；Stir 3 minutes after furnace charge is completely melt, after having stirred, be incubated 30 minutes at 750 DEG C, remove molten surface scum silica frost, will Mg-Zn-Cr-Bi-Zr alloying metal liquid is poured in the metal mold of diameter phi=30mm, obtains Mg-5.5Zn-0.2Cr- 0.5Bi-0.3Zr cast alloy material；
4, Mg-5.5Zn-0.2Cr-0.5Bi-0.3Zr cast alloy material is placed in vacuum heat treatment furnace, at 380 DEG C After lower diffusion annealing 48h, cool to room temperature with the furnace, then line cuts into the aging strengthening model of diameter phi=10mm, length h=15mm With sample and plate type tensile specimen；
5, by the aging strengthening model sample of line well cutting and plate type tensile specimen 360 DEG C of solid solutions 16 hours, water-cooled, so After at 160 DEG C timeliness 250 hours, obtain Mg-5.5Zn-0.2Cr-0.5Bi-0.3Zr age-hardening magnesium alloy.
The Mg-5.5Zn-0.2Cr-0.5Bi-0.3Zr alloy obtained peak hardness after 160 DEG C of timeliness 50h is 88HV, Tensile strength sigmab=295MPa, elongation percentage is δ=14%；After 160 DEG C of timeliness 275h, the timeliness hardness of alloy is 81HV, anti- Tensile strength σb=269MPa, elongation percentage is δ=11%.
The Mg-5.5Zn-0.2Cr-0.5Bi-0.3Zr alloy aging hardening curve that the present embodiment obtains is as it is shown in figure 1, close Gold keeps higher hardening rate at ageing impact toughness, 160 DEG C after 50h timeliness alloy reach peak hardness 88HV, continue to prolong Long aging time, alloy rigidity entirety presents downward trend, but fall off rate is relatively slower, and after 275h timeliness, hardness is 81HV, hereafter hardness fall off rate is the slowest.
Additionally, tensile sample uses line cutting sampling, sample size is as shown in Figure 2.
Embodiment 2:
A kind of Mg-Zn-Cr-Bi-Zr alloy age-hardenable, its each component and mass percent be: Zn:5.5%, Cr:0.2%, Bi:0.8%, Zr:0.3%, surplus is Mg, gross mass 100%.
Its preparation method is as follows:
1, calculate with melt quality percent, weigh magnesium ingot (purity is 99.9%) 94%, zinc ingot metal (purity is 99.9%) 6%, metal Cr (purity is 99.9%) 0.21%, metal Bi (purity is 99.9%) 0.9%, MgZr30 intermediate alloy 1.05%；
2, put in crucible electrical resistance furnace after the metal charge weighed up being carried out prewarming baking at 200 DEG C；
3, the heating-up temperature of crucible electrical resistance furnace is set as 740 DEG C, when crucible temperature rises to 350 DEG C, first in crucible Add magnesium ingot, zinc ingot metal, metal Cr and MgZr30 intermediate alloy, be passed through 0.1%SF6-99.9%CO2Mixed gas as protection Gas；Continue to heat up, after the magnesium ingot in crucible, zinc ingot metal, metal Cr and MgZr30 intermediate alloy are completely melt, add metal Bi；Stir 2 minutes after furnace charge is completely melt, after having stirred, be incubated 25 minutes at 740 DEG C, remove molten surface scum silica frost, will Mg-Zn-Cr-Bi-Zr alloying metal liquid is poured in the metal mold of diameter phi=30mm, obtains Mg-5.5Zn-0.2Cr- 0.8Bi-0.3Zr cast alloy material；
4, Mg-5.5Zn-0.2Cr-0.8Bi-0.3Zr cast alloy material is placed in vacuum heat treatment furnace, at 380 DEG C After lower diffusion annealing 48h, cool to room temperature with the furnace, then line cuts into the aging strengthening model of diameter phi=10mm, length h=15mm With sample and plate type tensile specimen；
5, by the aging strengthening model sample of line well cutting and plate type tensile specimen 370 DEG C of solid solutions 20 hours, water-cooled, so After at 160 DEG C timeliness 0～400 hours, obtain Mg-5.5Zn-0.2Cr-0.8Bi-0.3Zr age-hardening magnesium alloy.
The Mg-5.5Zn-0.2Cr-0.8Bi-0.3Zr alloy obtained is 86HV in the peak hardness of 160 DEG C of timeliness 45h, anti- Tensile strength σb=283MPa, elongation percentage is δ=12%；After 160 DEG C of timeliness 250h, the timeliness hardness of alloy is 79HV, tension Intensity σb=257MPa, elongation percentage is δ=9%.
Embodiment 3:
A kind of Mg-Zn-Cr-Bi-Zr alloy age-hardenable, its each component and mass percent be: Zn:8%, Cr: 0.2%, Bi:0.5%, Zr:0.3%, surplus is Mg, gross mass 100%.
Its preparation method is as follows:
1, calculate with melt quality percent, weigh magnesium ingot (purity is 99.9%) 91%, zinc ingot metal (purity is 99.9%) 9%, metal Cr (purity is 99.9%) 0.21%, metal Bi (purity is 99.9%) 0.55%, MgZr30 intermediate alloy 1.05%；
2, put in crucible electrical resistance furnace after the metal charge weighed up being carried out prewarming baking at 200 DEG C；
3, the heating-up temperature of crucible electrical resistance furnace is set as 750 DEG C, when crucible temperature rises to 380 DEG C, first in crucible Add magnesium ingot, zinc ingot metal, metal Cr and MgZr30 intermediate alloy, be passed through CO2/SF6Mixed gas as protection gas；Continue to heat up, After the magnesium ingot in crucible, zinc ingot metal, metal Cr and MgZr30 intermediate alloy are completely melt, add metal Bi；Treat that furnace charge is complete Stir 5 minutes after fusing, after having stirred, be incubated 28 minutes at 760 DEG C, remove molten surface scum silica frost, by Mg-8Zn-0.2Cr- 0.5Bi-0.3Zr alloying metal liquid is poured in the metal mold of diameter phi=30mm, obtains Mg-8Zn-0.2Cr-0.5Bi- 0.3Zr state alloy material；
4, Mg-8Zn-0.2Cr-0.5Bi-0.3Zr cast alloy material is placed in vacuum heat treatment furnace, at 380 DEG C After diffusion annealing 48h, cool to room temperature with the furnace, then line cuts into diameter phi=10mm, the aging strengthening model of length h=15mm is used Sample and plate type tensile specimen；
5, by the aging strengthening model sample of line well cutting and plate type tensile specimen 360 DEG C of solid solutions 24 hours, water-cooled, so After at 160 DEG C timeliness 0～400 hours, obtain Mg-8Zn-0.2Cr-0.5Bi-0.3Zr age-hardening magnesium alloy.
The Mg-8Zn-0.2Cr-0.5Bi-0.3Zr alloy obtained is 88HV in the peak hardness of 160 DEG C of timeliness 54h, tension Intensity σb=322MPa, elongation percentage is δ=13%；After 160 DEG C of timeliness 288h, the timeliness hardness of alloy is 83HV, and tension is strong Degree σb=280MPa, elongation percentage is δ=10%.
Embodiment 4:
A kind of Mg-Zn-Cr-Bi-Zr alloy age-hardenable, its each component and mass percent be: Zn:8%, Cr: 0.2%, Bi:0.8%, Zr:0.3%, surplus is Mg, gross mass 100%.
Its preparation method is as follows:
1, calculate with melt quality percent, weigh magnesium ingot (purity is 99.9%) 91%, zinc ingot metal (purity is 99.9%) 9%, metal Cr (purity is 99.9%) 0.21%, metal Bi (purity is 99.9%) 0.9%, MgZr30 intermediate alloy 1.05%；
2, put in crucible electrical resistance furnace after the metal charge weighed up being carried out prewarming baking at 200 DEG C；
3, the heating-up temperature of crucible electrical resistance furnace is set as 760 DEG C, when crucible temperature rises to 400 DEG C, first in crucible Add magnesium ingot, zinc ingot metal, metal Cr and MgZr30 intermediate alloy, be passed through CO2/SF6Mixed gas as protection gas；Continue to heat up, After the magnesium ingot in crucible, zinc ingot metal, metal Cr and MgZr30 intermediate alloy are completely melt, add metal Bi；Treat that furnace charge is complete Stir 3 minutes after fusing, after having stirred, be incubated 30 minutes at 750 DEG C, remove molten surface scum silica frost, by Mg-8Zn-0.2Cr- 0.8Bi-0.3Zr alloying metal liquid is poured in the metal mold of diameter phi=30mm, obtains Mg-8Zn-0.2Cr-0.8Bi- 0.3Zr cast alloy material；
4, Mg-8Zn-0.2Cr-0.8Bi-0.3Zr cast alloy material is placed in vacuum heat treatment furnace, at 380 DEG C After diffusion annealing 48h, cool to room temperature with the furnace, then line cuts into diameter phi=10mm, the aging strengthening model of length h=15mm is used Sample and plate type tensile specimen；
5, by the aging strengthening model sample of line well cutting and plate type tensile specimen 380 DEG C of solid solutions 16 hours, water-cooled, so After at 160 DEG C timeliness 0～400 hours, obtain Mg-8Zn-0.2Cr-0.8Bi-0.3Zr age-hardening magnesium alloy.
The Mg-8Zn-0.2Cr-0.8Bi-0.3Zr alloy obtained is 89HV in the peak hardness of 160 DEG C of timeliness 48h, tension Intensity σb=297MPa, elongation percentage is δ=11%；After 160 DEG C of timeliness 256h, the timeliness hardness of alloy is 81HV, and tension is strong Degree σb=264MPa, elongation percentage is δ=9%.
Embodiment 5:
A kind of Mg-Zn-Cr-Bi-Zr alloy age-hardenable, its each component and mass percent be: Zn:4%, Cr: 0.1%, Bi:0.3%, Zr:0.5%, surplus is Mg, gross mass 100%.
Its preparation method is as follows:
1, calculating with melt quality percent, weigh magnesium ingot (purity is 99.9%) 95.5%, (purity is zinc ingot metal 99.9%) 4.5%, metal Cr (purity is 99.9%) 0.11%, metal Bi (purity is 99.9%) 0.35%, in the middle of MgZr30 Alloy 1.7%；
2, put in crucible electrical resistance furnace after the metal charge weighed up being carried out prewarming baking at 200 DEG C；
3, the heating-up temperature of crucible electrical resistance furnace is set as 760 DEG C, when crucible temperature rises to 400 DEG C, first in crucible Add magnesium ingot, zinc ingot metal, metal Cr and MgZr30 intermediate alloy, be passed through CO2/SF6Mixed gas as protection gas；Continue to heat up, After the magnesium ingot in crucible, zinc ingot metal, metal Cr and MgZr30 intermediate alloy are completely melt, add metal Bi；Treat that furnace charge is complete Stir 5 minutes after fusing, after having stirred, be incubated 25 minutes at 760 DEG C, remove molten surface scum silica frost, by Mg-4Zn-0.1Cr- 0.3Bi-0.5Zr alloying metal liquid is poured in the metal mold of diameter phi=30mm, obtains Mg-4Zn-0.1Cr-0.3Bi- 0.5Zr cast alloy material；
4, Mg-4Zn-0.1Cr-0.3Bi-0.5Zrr cast alloy material is placed in vacuum heat treatment furnace, at 380 DEG C After diffusion annealing 48h, cool to room temperature with the furnace, then line cuts into diameter phi=10mm, the aging strengthening model of length h=15mm is used Sample and plate type tensile specimen；
5, by the aging strengthening model sample of line well cutting and plate type tensile specimen 360 DEG C of solid solutions 16 hours, water-cooled, so After at 160 DEG C timeliness 0～400 hours, obtain Mg-4Zn-0.1Cr-0.3Bi-0.5Zr age-hardening magnesium alloy.
The Mg-4Zn-0.1Cr-0.3Bi-0.5Zr alloy obtained is 84HV in the peak hardness of 160 DEG C of timeliness 48h, tension Intensity σb=282MPa, elongation percentage is δ=10%；After 160 DEG C of timeliness 225h, the timeliness hardness of alloy is 76HV, and tension is strong Degree σb=251MPa, elongation percentage is δ=8%.
Embodiment 6:
A kind of Mg-Zn-Cr-Bi-Zr alloy age-hardenable, its each component and mass percent be: Zn:10.0%, Cr:0.5%, Bi:1.0%, Zr:0.4%, surplus is Mg, gross mass 100%.
Its preparation method is as follows:
1, calculating with melt quality percent, weigh magnesium ingot Mg (purity is 99.9%) 89%, (purity is zinc ingot metal 99.9%) 11%, metal Cr (purity is 99.9%) 0.52%, closes in the middle of metal Bi (purity is 99.9%) 1.1%, MgZr30 Gold 1.4%；
2, put in crucible electrical resistance furnace after the metal charge weighed up being carried out prewarming baking at 200 DEG C；
3, the heating-up temperature of crucible electrical resistance furnace is set as 760 DEG C, when crucible temperature rises to 400 DEG C, first in crucible Add magnesium ingot, zinc ingot metal, metal Cr and MgZr30 intermediate alloy, be passed through CO2/SF6Mixed gas as protection gas；Continue to heat up, After the magnesium ingot in crucible, zinc ingot metal, metal Cr and MgZr30 intermediate alloy are completely melt, add metal Bi；Treat that furnace charge is complete Stir 3 minutes after fusing, after having stirred, be incubated 30 minutes at 750 DEG C, remove molten surface scum silica frost, by Mg-10Zn-0.5Cr- Bi-0.4Zr alloying metal liquid is poured in the metal mold of diameter phi=30mm, obtains Mg-10Zn-0.5Cr-Bi-0.4Zr as cast condition Alloy material；
4, Mg-10Zn-0.5Cr-1.0Bi-0.4Zr cast alloy material is placed in vacuum heat treatment furnace, at 380 DEG C After diffusion annealing 48h, cool to room temperature with the furnace, then line cuts into diameter phi=10mm, the aging strengthening model of length h=15mm is used Sample and plate type tensile specimen；
5, by the aging strengthening model sample of line well cutting and plate type tensile specimen 360 DEG C of solid solutions 16 hours, water-cooled, so After at 160 DEG C timeliness 0～400 hours, obtain Mg-10Zn-0.5Cr-1.0Bi-0.4Zr age-hardening magnesium alloy.
The Mg-10Zn-0.5Cr-1.0Bi-0.4Zr alloy obtained is 87HV in the peak hardness of 160 DEG C of timeliness 40h, anti- Tensile strength σb=289MPa, elongation percentage is δ=10%；After 160 DEG C of timeliness 200h, the timeliness hardness of alloy is 80HV, tension Intensity σb=259MPa, elongation percentage is δ=7%.
Above-described embodiment 1-6 need to consider alloying element burn out rate in fusion process (burn out rate of Zn is 8～11%, The burn out rate of Bi is 8～11%, and the burn out rate of Cr is 3～5%, and the burn out rate of Zr is 3～5%).
By certain with existing addition for preparation-obtained for above-described embodiment Mg-Zn-Cr-Bi-Zr alloy age-hardenable The performance of the Mg-Zn bianry alloy (patent CN 102071345 A, CN 101407880 A) of amount alloying element compares, knot Fruit is shown in Table 1.
Table 1 embodiment of the present invention alloy and the Performance comparision of existing Mg-Zn alloy
Alloy Tensile strength sigmab/MPa Elongation percentage δ/% Hardness
Patent CN 102071345 A 240～270 11～17 /
Patent CN 101407880 A 255～322 9.82～15.82 62～91HRB
Embodiment 1 269～295 11～14 81～88HV
Embodiment 2 257～283 9～12 79～86HV
Embodiment 3 280～322 10～13 83～88HV
Embodiment 4 264～297 9～11 81～89HV
Embodiment 5 251～282 8～10 76～84HV
Embodiment 6 259～289 7～10 80～87HV
As seen from the above table, the casting Mg-Zn-Cr-Bi-Zr alloy 360 of the present invention～380 DEG C of solid solutions 16～24 hours, water Cold, the peak hardness under 160 DEG C of timeliness is 89HV, the maximum tensile strength σ to the maximumb=322MPa, maximum elongation percentage be δ= 14%；In the overaging stage, alloy rigidity is 83HV, tensile strength sigmab=280MPa, elongation percentage is δ=11%.
To sum up, it can be deduced that to draw a conclusion:
(1) compared with patent CN 102071345 A, the timeliness Heat stability is good of the present invention, long-time timeliness remains to keep Higher age-hardening effect；
(2) compared with patent CN 101407880 A, the casting cost of the present invention is much lower, because this patent adds 0.3～the Nd of 1.5%, the cost of alloy can be dramatically increased.

Claims (4)

1. a Mg-Zn-Cr-Bi-Zr alloy age-hardenable, it is characterised in that: the mass percent of described alloy compositions For: Zn 5.5%～10%, Cr 0.1%～0.5%, Bi 0.3%～1.0%, Zr 0.3%～0.5%, surplus is Mg, gross mass 100%。
Mg-Zn-Cr-Bi-Zr alloy age-hardenable the most according to claim 1, it is characterised in that described alloy group The mass percent divided is: Zn 5.5%, Cr 0.2%, Bi 0.5%, Zr 0.3%, surplus is Mg, gross mass 100%.
3. the method preparing Mg-Zn-Cr-Bi-Zr alloy age-hardenable described in claim 1 or 2, its feature exists In, comprise the following steps:
S1, uses magnesium ingot, zinc ingot metal, metal Cr, metal Bi and MgZr30 intermediate alloy as raw material, joins according to each component of alloy Ratio calculates the mass percent needed for raw material；
S2, puts in crucible electrical resistance furnace after described raw material is carried out prewarming baking at 200 DEG C；
S3, is set as 740～760 DEG C by the heating-up temperature of crucible electrical resistance furnace, when crucible temperature rises to 350～400 DEG C, first to Crucible adds magnesium ingot, zinc ingot metal, metal Cr and MgZr30 intermediate alloy, is passed through CO2/SF6Mixed gas as protection gas；Continue Temperature of continuing rising, after the magnesium ingot in crucible, zinc ingot metal, metal Cr and MgZr30 intermediate alloy are completely melt, adds metal Bi；Treat stove Material stirs 2～5 minutes after being completely melt, is incubated 25～30 minutes at 740～760 DEG C, removes molten surface scum silica frost, by Mg-Zn- Cr-Bi-Zr alloying metal liquid is poured in metal mold, obtains Mg-Zn-Cr-Bi-Zr cast alloy material；
S4, is placed in Mg-Zn-Cr-Bi-Zr cast alloy material in vacuum heat treatment furnace, diffusion annealing 48h at 380 DEG C, with Stove is cooled to room temperature, then line cuts into aging strengthening model sample and plate type tensile specimen；
S5, aging strengthening model sample step S4 obtained and plate type tensile specimen are little in 360～380 DEG C of solid solutions 16～24 Time, then timeliness 0～400 hours at 160 DEG C, obtain Mg-Zn-Cr-Bi-Zr age-hardening magnesium alloy.
The preparation method of Mg-Zn-Cr-Bi-Zr alloy the most age-hardenable, it is characterised in that bag Include following steps:
S1, uses magnesium ingot, zinc ingot metal, metal Cr, metal Bi and MgZr30 intermediate alloy as raw material, joins according to each component of alloy Ratio calculates the mass percent needed for raw material；
S2, puts in crucible electrical resistance furnace after described raw material is carried out prewarming baking at 200 DEG C；
S3, is set as 760 DEG C by the heating-up temperature of crucible electrical resistance furnace, when crucible temperature rises to 400 DEG C, first adds in crucible Magnesium ingot, zinc ingot metal, metal Cr and MgZr30 intermediate alloy, be passed through 0.1% SF6-99.9% CO2Mixed gas as protection gas；Continue Temperature of continuing rising, after the magnesium ingot in crucible, zinc ingot metal, metal Cr and MgZr30 intermediate alloy are completely melt, adds metal Bi；Treat stove Material stirs 3 minutes after being completely melt, is incubated 30 minutes at 750 DEG C, removes molten surface scum silica frost, by Mg-Zn-Cr-Bi-Zr alloy Pouring metal melt, in the metal mold of a diameter of 30mm, obtains Mg-Zn-Cr-Bi-Zr cast alloy material；
S4, is placed in Mg-Zn-Cr-Bi-Zr cast alloy material in vacuum heat treatment furnace, diffusion annealing 48h at 380 DEG C, with Stove is cooled to room temperature, then line cuts into diameter 10mm, the aging strengthening model sample of length 15mm and plate type tensile specimen；
S5, aging strengthening model sample step S4 obtained and plate type tensile specimen, 360 DEG C of solid solutions 16 hours, then exist Timeliness 0～400 hours at 160 DEG C, obtain Mg-Zn-Cr-Bi-Zr age-hardening magnesium alloy.
CN201410522382.4A 2014-09-30 2014-09-30 Mg-Zn-Cr-Bi-Zr alloy age-hardenable and preparation method thereof Active CN104294131B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410522382.4A CN104294131B (en) 2014-09-30 2014-09-30 Mg-Zn-Cr-Bi-Zr alloy age-hardenable and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410522382.4A CN104294131B (en) 2014-09-30 2014-09-30 Mg-Zn-Cr-Bi-Zr alloy age-hardenable and preparation method thereof

Publications (2)

Publication Number Publication Date
CN104294131A CN104294131A (en) 2015-01-21
CN104294131B true CN104294131B (en) 2016-08-24

Family

ID=52314077

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410522382.4A Active CN104294131B (en) 2014-09-30 2014-09-30 Mg-Zn-Cr-Bi-Zr alloy age-hardenable and preparation method thereof

Country Status (1)

Country Link
CN (1) CN104294131B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105154733B (en) * 2015-10-18 2017-08-25 河北工业大学 A kind of non-rare earth cast magnesium alloy and preparation method thereof
CN106834842A (en) * 2017-02-10 2017-06-13 刘彤 A kind of alloy material for orthopaedics implantation and preparation method thereof
CN107190189B (en) * 2017-05-19 2018-10-23 管家依 A kind of magnesium alloy and preparation method thereof having both mechanics and corrosion resistance
CN109355540B (en) * 2018-12-14 2020-10-16 东北大学 High-strength Mg-Zn-Cu-Zr-Cr-Ca alloy and preparation method thereof
CN111455244B (en) * 2020-04-24 2021-07-20 山西恒镁新材料科技有限公司 Magnesium alloy

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104046872A (en) * 2014-06-09 2014-09-17 广东省工业技术研究院(广州有色金属研究院) Bi-containing deforming magnesium alloy

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57148495A (en) * 1981-03-10 1982-09-13 Onkyo Corp Diaphragm for speaker

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104046872A (en) * 2014-06-09 2014-09-17 广东省工业技术研究院(广州有色金属研究院) Bi-containing deforming magnesium alloy

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
The effect of micro-alloying addition of Cr on age hardening of an Mg-Zn alloy;J.Buha;《Materials Science and Engineering A》;20080925;第492卷(第1-2期);第293-294页 *

Also Published As

Publication number Publication date
CN104294131A (en) 2015-01-21

Similar Documents

Publication Publication Date Title
CN108425050B (en) High-strength high-toughness aluminum lithium alloy and preparation method thereof
CN104294131B (en) Mg-Zn-Cr-Bi-Zr alloy age-hardenable and preparation method thereof
EP3650561B1 (en) Plastic wrought magnesium alloy and preparation method thereof
CN101974709A (en) Super-soft aluminum alloy conductor and preparation method thereof
CN107747014B (en) One kind having high ductibility high-strength magnesium alloy and preparation method thereof
CN104152769B (en) A kind of heat conductive magnesium alloy and preparation method thereof
CN105039817B (en) The preparation method and multicomponent heat-resistant magnesium alloy of a kind of multicomponent heat-resistant magnesium alloy
CN105734588B (en) A kind of abyssal environment high-performance aluminium alloy sacrificial anode and preparation method thereof
CN106435273B (en) A kind of high-plasticity corrosion-resistance Zn-Cu-Ti alloys and preparation method thereof
CN104928549B (en) A kind of casting magnesium-rare earth alloy of high-strength high-elasticity modulus and preparation method thereof
CN112322948A (en) Magnesium alloy and preparation method thereof
CN103469039B (en) The magnesium-aluminum-zinc wrought magnesium alloys of a kind of calcic and rare earth samarium
CN109852859B (en) High-strength-toughness heat-resistant Mg-Y-Er alloy suitable for gravity casting and preparation method thereof
CN109881057A (en) A kind of high-strength and high ductility material and preparation method thereof
CN105039816A (en) Low-cost, high-strength and heat-resisting magnesium alloy and preparation method thereof
CN107190189A (en) A kind of magnesium alloy for having mechanics and corrosion resistance concurrently and preparation method thereof
CN113897567B (en) Homogenization thermomechanical treatment method for rapidly refining and homogenizing cast aluminum-lithium alloy
CN110669968A (en) Heat-resistant rare earth aluminum alloy and preparation method thereof
CN106834806B (en) Corrosion-resistant zinc alloy and preparation method thereof
Zhang et al. Effect of La addition on semi-solid microstructure evolution of Mg-7Zn magnesium alloy
CN101824570B (en) AZ series magnesium-beryllium rare earth alloy material and method for preparing same
CN106498252B (en) A kind of high-strength magnesium neodymium zinc zirconium lithium alloy and preparation method thereof
CN107354355A (en) A kind of cast magnesium alloy and preparation method thereof
CN104846234B (en) Cu-Zr-Ag alloy crystallizer copper plate and preparation process thereof
CN109112373B (en) Preparation method of high-strength Mg-Li-Sn-Zn ultra-light alloy

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant