CN105908040A - Mg-Gd-Zn-Ni-Zr rare-earth magnesium alloy for semisolid forming and preparation method for semisolid blank of semisolid Mg-Gd-Zn-Ni-Zr rare-earth magnesium alloy - Google Patents
Mg-Gd-Zn-Ni-Zr rare-earth magnesium alloy for semisolid forming and preparation method for semisolid blank of semisolid Mg-Gd-Zn-Ni-Zr rare-earth magnesium alloy Download PDFInfo
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- CN105908040A CN105908040A CN201610455873.0A CN201610455873A CN105908040A CN 105908040 A CN105908040 A CN 105908040A CN 201610455873 A CN201610455873 A CN 201610455873A CN 105908040 A CN105908040 A CN 105908040A
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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
- C22C23/06—Alloys based on magnesium with a rare earth metal 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
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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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
- C22C1/12—Making non-ferrous alloys by processing in a semi-solid state, e.g. holding the alloy in the solid-liquid phase
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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 an Mg-Gd-Zn-Ni-Zr rare-earth magnesium alloy for semisolid forming and a preparation method for a semisolid blank of the semisolid Mg-Gd-Zn-Ni-Zr rare-earth magnesium alloy. The alloy comprises the following components in percentage by weight: 15-21% of Gd, 2.0-3.6% of Zn, 0-0.5% of Ni, 0.3-0.7% of Zr and Mg in balancing amount. The preparation method for the semisolid blank comprises the following steps: taking pure Mg, pure Gd, pure Zn, pure Ni and an Mg-30wt.%Zr intermediate alloy as raw materials, first smelting the raw materials to prepare a master alloy ingot, then performing low-temperature semisolid isothermal heat treatment of the master alloy ingot, and finally performing water quenching to obtain the semisolid blank. The magnesium alloy for semisolid forming, provided by the invention, belongs to an Mg-RE series high-strength magnesium alloy, the semisolid forming temperature of the magnesium alloy is low, the solid-phase content of the magnesium alloy has low susceptibility to temperature variation, and the roundness of obtained solid-phase particles is high. According to the preparation method for the semisolid blank, provided by the invention, the preparation temperature is low, less oxidation and combustion are caused, the process is easy to control, and a semisolid forming technology is appropriate for preparing high-strength and complex-shaped magnesium alloy parts.
Description
Technical field
The present invention relates to a kind of magnesium alloy and preparation method thereof, be specifically related to the Mg-Gd-Zn-of a kind of semi-solid-state shaping
Zr magnesium alloy and the preparation method of semi-solid blank thereof.
Background technology
Semi-solid Metals Forming Techniques have efficient, energy-conservation, near (only) shape produce, the high many of drip molding performance excellent
Point, is described as the metal material processing technology of 21st century most prospect, the especially semi-solid-state shaping of magnesium alloy, can significantly drop
Low common pressure casting method produces oxidation, burning and the defect such as pore and shrinkage porosite during Magnesium Alloys Components, big for magnesium alloy
Scope promotion and application lay the first stone.Preparation has the premise that the high-quality blank of non-dendritic structure is semi-solid-state shaping.Magnesium alloy
The preparation method of semi-solid blank is a lot, such as mechanical mixing method, electromagnetic stirring method, ultrasonic activation method, stress-induced melt
Activation method, near liquidus casting and semi-solid isothermal heat-treatment method etc..Wherein, semi-solid isothermal heat-treatment method is by metal
Blank carries out Isothermal treatment in solid-liquid two-phase temperature range, makes alloy be changed into spherical or non-dendritic structure by arborescent structure
Method, there is technique and equipment simple, easy-operating advantage.The more important thing is, the method is without being manufactured separately semisolid blank
Material, and the secondary heating process before semi-solid-state shaping realizes the n on-dendritic of microstructure of semisolid and forms semi-solid blank,
Decrease processing step, reduce the process costs of semi-solid-state shaping, be a kind of ideal magnesium alloy semi-solid state blank system
Preparation Method.
Semi-solid isothermal heat-treatment is prepared the method for magnesium alloy semi-solid state blank and is successfully used for Mg-Al, Mg-Zn, Mg-RE
Being alloy, wherein Mg-RE system magnesium-rare earth belongs to high-strength heat-resisting magnesium alloy.At present, magnesium alloy Isothermal treatment preparation half
The temperature of solid blank all uses the fusion temperature higher than Mg phase, and making Mg phase partial remelting is that liquid phase forms semi-solid state,
Thus obtain semi-solid blank, and then carry out semi-solid-state shaping.But, due to Mg in Mg-RE series high strength magnesium-rare earth
Fusing point is higher, and this makes semi-solid isothermal heat-treatment prepare the temperature of the temperature of semi-solid blank and corresponding semi-solid-state shaping relatively
Height, usually above 600 DEG C (such as, high " the Microstructure evolution during reheating of delivered of heap of stone
Extruded Mg-Gd-Y-Zr alloy into semisolid state ", " Transactions of Nonferrous
Metals Society of China " 2010 years volume 20 1585-1590 page；Guohua Wu delivers
“Microstructure evolution of semi-solid Mg-10Gd-3Y-0.5Zr alloy during
Isothermal heat treatment ", " Journal of Magnesium and alloys " volume 1 39-in 2013
Page 46), cause the risk of magnesium alloy oxidation and burning to increase, and then the quality reducing magnesium alloy finished product reduces, and increases semisolid
The energy consumption shaped and production cost.Therefore, develop the Mg-RE series magnesium alloy of novel semi-solid-state shaping, reduce Isothermal treatment
Prepare the temperature of magnesium alloy semi-solid state blank, and then the temperature of reduction semi-solid-state shaping, be the problem that solution is presently required.
Summary of the invention
It is an object of the invention to overcome the deficiency of existing research, it is provided that a kind of semi-solid-state shaping Mg-Gd-Zn-Ni-Zr
Magnesium-rare earth and preparation method of semi-solid blank thereof, the semi-solid-state shaping for magnesium-rare earth provides technical support.
The present invention is achieved by the following technical solutions:
Magnesium alloy for semi-solid forming involved in the present invention, is a kind of Mg-Gd-Zn-Ni-Zr magnesium-rare earth, and it becomes packet
One-tenth (by weight percentage) is: Gd:15～21%, Zn:2.0～3.6%, Ni:0～0.5%, Zr:0.3～0.7%, remaining is Mg.
The preparation method of magnesium alloy semi-solid state blank involved in the present invention, comprises the following steps:
The first step, dispensing: with pure Mg, pure Gd, pure Zn, pure Ni and Mg-30wt.%Zr intermediate alloy as raw material, according to above-mentioned magnesium
Alloy formula dispensing.
Second step, fusing: after being melted by Mg, temperature rises to 750 DEG C, after adding pure Gd, pure Zn, pure Ni, then heats to
780 DEG C of insulation 120 min, afterwards by molten metal uniform stirring；Treat that temperature is down to 750 DEG C subsequently, add in the middle of Mg-30wt.%Zr
Alloy, and be incubated 30min, last uniform stirring and obtain the uniform metal liquid of composition.
3rd step, solidification: the metal liquid obtained by second step, be incubated 10 min at 710 DEG C, afterwards with 5～20 DEG C/s
Cooling velocity cooling, after solidification obtain master alloy ingot.
4th step, Isothermal treatment: the master alloy ingot that the 3rd step obtains is placed in heat-treatment furnace, is melting less than Mg phase
Temperature and be heat treatment temperature higher than an optional temperature within the temperature range of eutectic structure fusion temperature, carry out Isothermal Hot
Processing, temperature retention time is 5～45min, and shrend afterwards obtains magnesium alloy semi-solid state blank.
The optimum value of described heat treatment temperature is higher than eutectic structure fusion temperature 20～30 DEG C；Described temperature retention time
Optimum value is 20min.Temperature retention time is depending on heat treatment temperature, and temperature is the highest, and temperature retention time is the shortest.
The magnesium alloy of the semi-solid-state shaping that the present invention provides, belongs to Mg-RE series high strength magnesium alloy, its semi-solid-state shaping
Temperature is low, and the sensitiveness that solid concentration varies with temperature is low, gained solid phase particles roundness high；The semisolid blank that the present invention provides
The preparation method of material, preparation temperature is low, aoxidizes and burns less, process is easily controlled, be suitable for employing semi-solid state forming technique prepares
High intensity, complex-shaped magnesium alloy parts.
Accompanying drawing explanation
Fig. 1 is the semi-solid alloy blank tissue topography of embodiment 1；
Fig. 2 is the semi-solid alloy blank tissue topography of embodiment 2；
Fig. 3 is the semi-solid alloy blank tissue topography of embodiment 3；
Fig. 4 is the semi-solid alloy blank tissue topography of embodiment 4；
Fig. 5 is the semi-solid alloy blank tissue topography of embodiment 5；
Fig. 6 is the semi-solid alloy blank tissue topography of embodiment 6；
Fig. 7 is the semi-solid alloy blank tissue topography of embodiment 7；
Fig. 8 is the semi-solid alloy blank tissue topography of embodiment 8；
Fig. 9 is the semi-solid alloy blank tissue topography of embodiment 9.
Detailed description of the invention
Below in conjunction with the accompanying drawings embodiments of the invention are elaborated: the present embodiment is being front with technical solution of the present invention
Put and implement, give detailed embodiment and concrete operating process.
Embodiment 1:Mg-15Gd-2Zn-0.5Ni-0.3Zr alloy, wherein Gd:15%, Zn:2.0%, Ni:0.5%, Zr:
0.3% (percentage by weight), remaining is Mg.
The preparation method of the semi-solid blank of this alloy comprises the steps:
The first step, dispensing: with pure Mg, pure Gd, pure Zn, pure Ni and Mg-30wt.%Zr intermediate alloy as raw material, according to Mg-
15Gd-2Zn-0.5Ni-0.3Zr alloy formula dispensing.
Second step, fusing: after being melted by Mg, temperature rises to 750 DEG C, after adding pure Gd, pure Zn, pure Ni, then heats to
780 DEG C of insulation 120 min, afterwards by molten metal uniform stirring；Treat that temperature is down to 750 DEG C subsequently, add in the middle of Mg-30wt.%Zr
Alloy, and be incubated 30min, last uniform stirring and obtain the uniform metal liquid of composition.
3rd step, solidification: the metal liquid obtained by second step, be incubated 10 min at 710 DEG C, afterwards with the cooling of 20 DEG C/s
Speed cools down, and obtains master alloy ingot after solidification.
4th step, Isothermal treatment: hot analysis result shows, the eutectic structure fusion temperature of the 3rd step gained master alloy ingot
It is 512 DEG C, and the temperature of Mg phase fusion temperature is 591 DEG C；Mg phase fusion temperature it is being less than higher than eutectic structure fusion temperature
Temperature range, selecting 532 DEG C is heat treatment temperature, carries out Isothermal treatment, and temperature retention time is 20min, afterwards shrend
Obtain magnesium alloy semi-solid state blank.
Fig. 1 is the microcosmic microscopic structure of Mg-15Gd-2Zn-0.5Ni-0.3Zr alloy semi-solid blank, and wherein white is
Mg phase solid phase particles, roundness is 0.83, and volume fraction is 70%, and black is eutectic structure.Fig. 1 shows prepared Mg-
15Gd-2Zn-0.5Ni-0.3Zr alloy semi-solid blank has excellent microstructure of semisolid.
Embodiment 2:Mg-15Gd-2.8Zn-0.3Ni-0.5Zr alloy, wherein Gd:15%, Zn:2.8%, Ni:0.3%,
Zr:0.5% (percentage by weight), remaining is Mg.
The preparation method of the semi-solid blank of this alloy comprises the steps:
The first step, dispensing: with pure Mg, pure Gd, pure Zn, pure Ni and Mg-30wt.%Zr intermediate alloy as raw material, according to Mg-
15Gd-2.8Zn-0.3Ni-0.5Zr alloy formula dispensing.
Second step, fusing: after being melted by Mg, temperature rises to 750 DEG C, after adding pure Gd, pure Zn, pure Ni, then heats to
780 DEG C of insulation 120 min, afterwards by molten metal uniform stirring；Treat that temperature is down to 750 DEG C subsequently, add in the middle of Mg-30wt.%Zr
Alloy, and be incubated 30min, last uniform stirring and obtain the uniform metal liquid of composition.
3rd step, solidification: the metal liquid obtained by second step, be incubated 10 min at 710 DEG C, afterwards with 10 DEG C/s's
Cooling velocity cools down, and obtains master alloy ingot after solidification.
4th step, Isothermal treatment: hot analysis result shows, the eutectic structure fusion temperature of the 3rd step gained master alloy ingot
It is 508 DEG C, and the temperature of Mg phase fusion temperature is 586 DEG C；Mg phase fusion temperature it is being less than higher than eutectic structure fusion temperature
Temperature range, selecting 533 DEG C is heat treatment temperature, carries out Isothermal treatment, and temperature retention time is 20min, afterwards shrend
Obtain magnesium alloy semi-solid state blank.
Fig. 2 is the microcosmic microscopic structure of Mg-15Gd-2.8Zn-0.3Ni-0.5Zr alloy semi-solid blank, and wherein white is
Mg phase solid phase particles, roundness is 0.84, and volume fraction is 65%, and black is eutectic structure.Fig. 1 shows prepared Mg-
15Gd-2.8Zn-0.3Ni-0.5Zr alloy semi-solid blank has excellent microstructure of semisolid.
Embodiment 3:Mg-15Gd-3.6Zn-0.7Zr alloy, wherein Gd:15%, Zn:3.6%, Zr:0.7% (weight percent
Than), remaining is Mg.
The preparation method of the semi-solid blank of this alloy comprises the steps:
The first step, dispensing: with pure Mg, pure Gd, pure Zn and Mg-30wt.%Zr intermediate alloy as raw material, according to Mg-15Gd-
3.6Zn-0.7Zr alloy formula dispensing.
Second step, fusing: after being melted by Mg, temperature rises to 750 DEG C, after adding pure Gd, pure Zn, then heats to 780 DEG C of guarantors
Temperature 120 min, afterwards by molten metal uniform stirring；Treat that temperature is down to 750 DEG C subsequently, add Mg-30wt.%Zr intermediate alloy, and
Insulation 30min, last uniform stirring and obtain the uniform metal liquid of composition.
3rd step, solidification: the metal liquid obtained by second step, be incubated 10 min, afterwards cold with 5 DEG C/s at 710 DEG C
But speed cooling, obtains master alloy ingot after solidification.
4th step, Isothermal treatment: hot analysis result shows, the eutectic structure fusion temperature of the 3rd step gained master alloy ingot
It is 502 DEG C, and the temperature of Mg phase fusion temperature is 583 DEG C；Mg phase fusion temperature it is being less than higher than eutectic structure fusion temperature
Temperature range, selecting 532 DEG C is heat treatment temperature, carries out Isothermal treatment, and temperature retention time is 20min, afterwards shrend
Obtain magnesium alloy semi-solid state blank.
Fig. 3 is the microcosmic microscopic structure of Mg-15Gd-3.6Zn-0.7Zr alloy semi-solid blank, and wherein white is that Mg phase is solid
Phase particle, roundness is 0.83, and volume fraction is 60%, and black is eutectic structure.Fig. 3 shows prepared Mg-15Gd-
3.6Zn-0.7Zr alloy semi-solid blank has excellent microstructure of semisolid.
Embodiment 4:Mg-18Gd-2Zn-0.5Ni-0.3Zr alloy, wherein Gd:18%, Zn:2.0%, Ni:0.5%, Zr:
0.3% (percentage by weight), remaining is Mg.
The preparation method of the semi-solid blank of this alloy comprises the steps:
The first step, dispensing: with pure Mg, pure Gd, pure Zn, pure Ni and Mg-30wt.%Zr intermediate alloy as raw material, according to Mg-
18Gd-2Zn-0.5Ni-0.3Zr alloy formula dispensing.
Second step, fusing: after being melted by Mg, temperature rises to 750 DEG C, after adding pure Gd, pure Zn, pure Ni, then heats to
780 DEG C of insulation 120 min, afterwards by molten metal uniform stirring；Treat that temperature is down to 750 DEG C subsequently, add in the middle of Mg-30wt.%Zr
Alloy, and be incubated 30min, last uniform stirring and obtain the uniform metal liquid of composition.
3rd step, solidification: the metal liquid obtained by second step, be incubated 10 min at 710 DEG C, afterwards with 20 DEG C/s's
Cooling velocity cools down, and obtains master alloy ingot after solidification.
4th step, Isothermal treatment: hot analysis result shows, the eutectic structure fusion temperature of the 3rd step gained master alloy ingot
It is 503 DEG C, and the temperature of Mg phase fusion temperature is 586 DEG C；Mg phase fusion temperature it is being less than higher than eutectic structure fusion temperature
Temperature range, selecting 523 DEG C is heat treatment temperature, carries out Isothermal treatment, and temperature retention time is 20min, afterwards shrend
Obtain magnesium alloy semi-solid state blank.
Fig. 4 is the microcosmic microscopic structure of Mg-18Gd-2Zn-0.5Ni-0.3Zr alloy semi-solid blank, and wherein white is
Mg phase solid phase particles, roundness is 0.83, and volume fraction is 70%, and black is eutectic structure.Fig. 4 shows prepared Mg-
18Gd-2Zn-0.5Ni-0.3Zr alloy semi-solid blank has excellent microstructure of semisolid.
Embodiment 5:Mg-18Gd-2.8Zn-0.3Ni-0.5Zr alloy, wherein Gd:18%, Zn:2.8%, Ni:0.3%,
Zr:0.5% (percentage by weight), remaining is Mg.
The preparation method of the semi-solid blank of this alloy comprises the steps:
The first step, dispensing: with pure Mg, pure Gd, pure Zn, pure Ni and Mg-30wt.%Zr intermediate alloy as raw material, according to Mg-
18Gd-2.8Zn-0.3Ni-0.5Zr alloy formula dispensing.
Second step, fusing: after being melted by Mg, temperature rises to 750 DEG C, after adding pure Gd, pure Zn, pure Ni, then heats to
780 DEG C of insulation 120 min, afterwards by molten metal uniform stirring；Treat that temperature is down to 750 DEG C subsequently, add in the middle of Mg-30wt.%Zr
Alloy, and be incubated 30min, last uniform stirring and obtain the uniform metal liquid of composition.
3rd step, solidification: the metal liquid obtained by second step, be incubated 10 min at 710 DEG C, afterwards with 10 DEG C/s's
Cooling velocity cools down, and obtains master alloy ingot after solidification.
4th step, Isothermal treatment: hot analysis result shows, the eutectic structure fusion temperature of the 3rd step gained master alloy ingot
It is 499 DEG C, and the temperature of Mg phase fusion temperature is 581 DEG C；Mg phase fusion temperature it is being less than higher than eutectic structure fusion temperature
Temperature range, selecting 524 DEG C is heat treatment temperature, carries out Isothermal treatment, and temperature retention time is 20min, afterwards shrend
Obtain magnesium alloy semi-solid state blank.
Fig. 5 is the microcosmic microscopic structure of Mg-18Gd-2.8Zn-0.3Ni-0.5Zr alloy semi-solid blank, and wherein white is
Mg phase solid phase particles, roundness is 0.84, and volume fraction is 65%, and black is eutectic structure.Fig. 5 shows prepared Mg-
18Gd-2.8Zn-0.3Ni-0.5Zr alloy semi-solid blank has excellent microstructure of semisolid.
Embodiment 6:Mg-18Gd-3.6Zn-0.7Zr alloy, wherein Gd:18%, Zn:3.6%, Zr:0.7% (weight hundred
Proportion by subtraction), remaining is Mg.
The preparation method of the semi-solid blank of this alloy comprises the steps:
The first step, dispensing: with pure Mg, pure Gd, pure Zn and Mg-30wt.%Zr intermediate alloy as raw material, according to Mg-18Gd-
3.6Zn-0.7Zr alloy formula dispensing.
Second step, fusing: after being melted by Mg, temperature rises to 750 DEG C, after adding pure Gd, pure Zn, then heats to 780 DEG C of guarantors
Temperature 120 min, afterwards by molten metal uniform stirring；Treat that temperature is down to 750 DEG C subsequently, add Mg-30wt.%Zr intermediate alloy, and
Insulation 30min, last uniform stirring and obtain the uniform metal liquid of composition.
3rd step, solidification: the metal liquid obtained by second step, be incubated 10 min, afterwards cold with 5 DEG C/s at 710 DEG C
But speed cooling, obtains master alloy ingot after solidification.
4th step, Isothermal treatment: hot analysis result shows, the eutectic structure fusion temperature of the 3rd step gained master alloy ingot
It is 493 DEG C, and the temperature of Mg phase fusion temperature is 578 DEG C；Mg phase fusion temperature it is being less than higher than eutectic structure fusion temperature
Temperature range, selecting 523 DEG C is heat treatment temperature, carries out Isothermal treatment, and temperature retention time is 20min, afterwards shrend
Obtain magnesium alloy semi-solid state blank.
Fig. 6 is the microcosmic microscopic structure of Mg-18Gd-3.6Zn-0.7Zr alloy semi-solid blank, and wherein white is that Mg phase is solid
Phase particle, roundness is 0.83, and volume fraction is 60%, and black is eutectic structure.Fig. 6 shows prepared Mg-18Gd-
3.6Zn-0.7Zr alloy semi-solid blank has excellent microstructure of semisolid.
Embodiment 7:Mg-21Gd-2Zn-0.5Ni-0.3Zr alloy, wherein Gd:21%, Zn:2.0%, Ni:0.5%, Zr:
0.3% (percentage by weight), remaining is Mg.
The preparation method of the semi-solid blank of this alloy comprises the steps:
The first step, dispensing: with pure Mg, pure Gd, pure Zn, pure Ni and Mg-30wt.%Zr intermediate alloy as raw material, according to Mg-
21Gd-2Zn-0.5Ni-0.3Zr alloy formula dispensing.
Second step, fusing: after being melted by Mg, temperature rises to 750 DEG C, after adding pure Gd, pure Zn, pure Ni, then heats to
780 DEG C of insulation 120 min, afterwards by molten metal uniform stirring；Treat that temperature is down to 750 DEG C subsequently, add in the middle of Mg-30wt.%Zr
Alloy, and be incubated 30min, last uniform stirring and obtain the uniform metal liquid of composition.
3rd step, solidification: the metal liquid obtained by second step, be incubated 10 min at 710 DEG C, afterwards with 20 DEG C/s's
Cooling velocity cools down, and obtains master alloy ingot after solidification.
4th step, Isothermal treatment: hot analysis result shows, the eutectic structure fusion temperature of the 3rd step gained master alloy ingot
It is 498 DEG C, and the temperature of Mg phase fusion temperature is 579 DEG C；Mg phase fusion temperature it is being less than higher than eutectic structure fusion temperature
Temperature range, selecting 518 DEG C is heat treatment temperature, carries out Isothermal treatment, and temperature retention time is 20min, afterwards shrend
Obtain magnesium alloy semi-solid state blank.
Fig. 7 is the microcosmic microscopic structure of Mg-21Gd-2Zn-0.5Ni-0.3Zr alloy semi-solid blank, and wherein white is
Mg phase solid phase particles, roundness is 0.83, and volume fraction is 70%, and black is eutectic structure.Fig. 7 shows prepared Mg-
21Gd-2Zn-0.5Ni-0.3Zr alloy semi-solid blank has excellent microstructure of semisolid.
Embodiment 8:Mg-21Gd-2.8Zn-0.3Ni-0.5Zr alloy, wherein Gd:21%, Zn:2.8%, Ni:0.3%,
Zr:0.5% (percentage by weight), remaining is Mg.
The preparation method of the semi-solid blank of this alloy comprises the steps:
The first step, dispensing: with pure Mg, pure Gd, pure Zn, pure Ni and Mg-30wt.%Zr intermediate alloy as raw material, according to Mg-
21Gd-2.8Zn-0.3Ni-0.5Zr alloy formula dispensing.
Second step, fusing: after being melted by Mg, temperature rises to 750 DEG C, after adding pure Gd, pure Zn, pure Ni, then heats to
780 DEG C of insulation 120 min, afterwards by molten metal uniform stirring；Treat that temperature is down to 750 DEG C subsequently, add in the middle of Mg-30wt.%Zr
Alloy, and be incubated 30min, last uniform stirring and obtain the uniform metal liquid of composition.
3rd step, solidification: the metal liquid obtained by second step, be incubated 10 min at 710 DEG C, afterwards with 10 DEG C/s's
Cooling velocity cools down, and obtains master alloy ingot after solidification.
4th step, Isothermal treatment: hot analysis result shows, the eutectic structure fusion temperature of the 3rd step gained master alloy ingot
It is 496 DEG C, and the temperature of Mg phase fusion temperature is 577 DEG C；Mg phase fusion temperature it is being less than higher than eutectic structure fusion temperature
Temperature range, selecting 521 DEG C is heat treatment temperature, carries out Isothermal treatment, and temperature retention time is 20min, afterwards shrend
Obtain magnesium alloy semi-solid state blank.
Fig. 8 is the microcosmic microscopic structure of Mg-21Gd-2.8Zn-0.3Ni-0.5Zr alloy semi-solid blank, and wherein white is
Mg phase solid phase particles, roundness is 0.84, and volume fraction is 65%, and black is eutectic structure.Fig. 8 shows prepared Mg-
18Gd-2.8Zn-0.3Ni-0.5Zr alloy semi-solid blank has excellent microstructure of semisolid.
Embodiment 9:Mg-21Gd-3.6Zn-0.7Zr alloy, wherein Gd:21%, Zn:3.6%, Zr:0.7% (weight hundred
Proportion by subtraction), remaining is Mg.
The preparation method of the semi-solid blank of this alloy comprises the steps:
The first step, dispensing: with pure Mg, pure Gd, pure Zn and Mg-30wt.%Zr intermediate alloy as raw material, according to Mg-21Gd-
3.6Zn-0.7Zr alloy formula dispensing.
Second step, fusing: after being melted by Mg, temperature rises to 750 DEG C, after adding pure Gd, pure Zni, then heats to 780 DEG C
It is incubated 120 min, afterwards by molten metal uniform stirring；Treat that temperature is down to 750 DEG C subsequently, add Mg-30wt.%Zr intermediate alloy,
And be incubated 30min, last uniform stirring and obtain the uniform metal liquid of composition.
3rd step, solidification: the metal liquid obtained by second step, be incubated 10 min, afterwards cold with 5 DEG C/s at 710 DEG C
But speed cooling, obtains master alloy ingot after solidification.
4th step, Isothermal treatment: hot analysis result shows, the eutectic structure fusion temperature of the 3rd step gained master alloy ingot
It is 488 DEG C, and the temperature of Mg phase fusion temperature is 571 DEG C；Mg phase fusion temperature it is being less than higher than eutectic structure fusion temperature
Temperature range, selecting 518 DEG C is heat treatment temperature, carries out Isothermal treatment, and temperature retention time is 20min, afterwards shrend
Obtain magnesium alloy semi-solid state blank.
Fig. 9 is the microcosmic microscopic structure of Mg-21Gd-3.6Zn-0.7Zr alloy semi-solid blank, and wherein white is that Mg phase is solid
Phase particle, roundness is 0.83, and volume fraction is 60%, and black is eutectic structure.Fig. 9 shows prepared Mg-21Gd-
3.6Zn-0.7Zr alloy semi-solid blank has excellent microstructure of semisolid.
Claims (4)
1. a semi-solid-state shaping Mg-Gd-Zn-Ni-Zr magnesium alloy, it is characterised in that: its one-tenth is grouped into (percentage by weight)
For 15～21% Gd, 2.0～3.6% Zn, 0～0.5% Ni, 0.3～0.7% Zr, surplus is Mg.
Semi-solid-state shaping Mg-Gd-Zn-Ni-Zr magnesium alloy the most according to claim 1, it is characterised in that: alloy is by Mg phase
Form with eutectic structure.
3. a semi-solid-state shaping preparation method for Mg-Gd-Zn-Ni-Zr magnesium alloy semi-solid state blank, comprises the steps:
The first step, dispensing: with pure Mg, pure Gd, pure Zn, pure Ni and Mg-30wt.%Zr intermediate alloy as raw material, want according to right
Seek magnesium alloy formula dispensing described in 1；
Second step, fusing: after being melted by Mg, temperature rises to 750 DEG C, after adding pure Gd, pure Zn, pure Ni, then heats to 780 DEG C
It is incubated 120 min, afterwards by molten metal uniform stirring；Treat that temperature is down to 750 DEG C subsequently, add Mg-30wt.%Zr intermediate alloy,
And be incubated 30min, last uniform stirring and obtain the uniform metal liquid of composition；
3rd step, solidification: the metal liquid obtained by second step, be incubated 10 min, afterwards cold with 5～20 DEG C/s at 710 DEG C
But speed cooling, obtains master alloy ingot after solidification；
4th step, Isothermal treatment: be placed in heat-treatment furnace by the master alloy ingot that the 3rd step obtains, melting higher than eutectic structure
Temperature and carry out Isothermal treatment less than an optional temperature within the temperature range of Mg phase fusion temperature, be incubated 5～45min, it
Rear shrend obtains magnesium alloy semi-solid state blank.
The preparation side of semi-solid-state shaping Mg-Gd-Zn-Ni-Zr magnesium alloy semi-solid state blank the most according to claim 3
Method, in the 4th step, the optimum temperature of Isothermal treatment is that optimal temperature retention time is higher than eutectic structure fusion temperature 20～30 DEG C
20min。
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109338132A (en) * | 2018-09-25 | 2019-02-15 | 南昌大学 | A kind of rare earth wrought magnesium alloy billet preparation method |
| CN111534731A (en) * | 2020-05-25 | 2020-08-14 | 珠海中科先进技术研究院有限公司 | Particle-reinforced medical magnesium-based composite material semi-solid billet and preparation method thereof |
| CN113699422A (en) * | 2021-09-03 | 2021-11-26 | 南京工程学院 | High-performance magnesium alloy with tension-compression symmetry and preparation method thereof |
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|---|---|---|---|---|
| JPH08134581A (en) * | 1994-11-14 | 1996-05-28 | Mitsui Mining & Smelting Co Ltd | Production of magnesium alloy |
| CN101787472A (en) * | 2010-03-18 | 2010-07-28 | 上海交通大学 | Heat-resistant forged magnesium-rare earth alloy and preparation method thereof |
| CN104195396A (en) * | 2014-08-04 | 2014-12-10 | 上海交通大学 | Heat-resistant rare-earth magnesium alloy containing silicon, zinc and Gd(-Y) and preparation method thereof |
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2016
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08134581A (en) * | 1994-11-14 | 1996-05-28 | Mitsui Mining & Smelting Co Ltd | Production of magnesium alloy |
| CN101787472A (en) * | 2010-03-18 | 2010-07-28 | 上海交通大学 | Heat-resistant forged magnesium-rare earth alloy and preparation method thereof |
| CN104195396A (en) * | 2014-08-04 | 2014-12-10 | 上海交通大学 | Heat-resistant rare-earth magnesium alloy containing silicon, zinc and Gd(-Y) and preparation method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109338132A (en) * | 2018-09-25 | 2019-02-15 | 南昌大学 | A kind of rare earth wrought magnesium alloy billet preparation method |
| CN109338132B (en) * | 2018-09-25 | 2021-01-05 | 南昌大学 | Preparation method of rare earth wrought magnesium alloy blank |
| CN111534731A (en) * | 2020-05-25 | 2020-08-14 | 珠海中科先进技术研究院有限公司 | Particle-reinforced medical magnesium-based composite material semi-solid billet and preparation method thereof |
| CN113699422A (en) * | 2021-09-03 | 2021-11-26 | 南京工程学院 | High-performance magnesium alloy with tension-compression symmetry and preparation method thereof |
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