CN105908040B - A kind of preparation method of semi-solid-state shaping Mg Gd Zn Ni Zr magnesium-rare earths and its semi-solid blank - Google Patents

A kind of preparation method of semi-solid-state shaping Mg Gd Zn Ni Zr magnesium-rare earths and its semi-solid blank Download PDF

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CN105908040B
CN105908040B CN201610455873.0A CN201610455873A CN105908040B CN 105908040 B CN105908040 B CN 105908040B CN 201610455873 A CN201610455873 A CN 201610455873A CN 105908040 B CN105908040 B CN 105908040B
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alloy
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CN105908040A (en
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尹健
卢春辉
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Nanchang Hangkong University
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C23/00Alloys based on magnesium
    • C22C23/06Alloys based on magnesium with a rare earth metal as the next major constituent
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/005Making alloys with holding in the range of the solid-liquid phase
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/02Making alloys by melting
    • C22C1/03Making alloys by melting using master alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/06Changing 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

A kind of preparation method the invention discloses semi-solid-state shaping with Mg Gd Zn Ni Zr magnesium alloys and its semi-solid blank.The alloying component forms(Percentage by weight)For:15~21%Gd, 2.0~3.6%Zn, Ni:0~0.5%Ni, 0.3~0.7%Zr, surplus Mg.The preparation method of the semi-solid blank is using pure Mg, pure Gd, pure Zn, pure Ni and Mg 30wt.%Zr intermediate alloys as raw material, and first melting is prepared into master alloy ingot, then obtains magnesium alloy semi-solid state blank by low temperature semi-solid isothermal heat-treatment, afterwards water quenching.The magnesium alloy of semi-solid-state shaping provided by the invention, belong to Mg RE series high strength magnesium alloys, the sensitiveness that its semi-solid-state shaping temperature is low, and solid concentration varies with temperature is low, gained solid phase particles roundness is high;The preparation method of semi-solid blank provided by the invention, preparation temperature is low, aoxidizes and burns less, process is easily controlled, is adapted to prepare high intensity, complex-shaped magnesium alloy parts using semi-solid forming technology.

Description

A kind of semi-solid-state shaping Mg-Gd-Zn-Ni-Zr magnesium-rare earths and its semisolid blank The preparation method of material
Technical field
The present invention relates to a kind of magnesium alloy and preparation method thereof, and in particular to a kind of Mg-Gd-Zn- of semi-solid-state shaping The preparation method of Zr magnesium alloys and its semi-solid blank.
Background technology
Semi-solid Metals Forming Techniques have efficiently, it is energy-conservation, near(Only)It is many excellent to shape production, drip molding performance height etc. Point, the semi-solid-state shaping of the metal material processing technology, especially magnesium alloy of 21st century most prospect is described as, can be dropped significantly The defects of oxidation, burning and stomata during low common pressure casting method production Magnesium Alloys Components and shrinkage porosite, be the big of magnesium alloy Scope promotion and application lay the first stone.Prepare the premise that the high-quality blank with 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, alloy is changed into spherical or non-dendritic structure by arborescent structure Method, have technique and equipment it is simple, easy-operating advantage.Importantly, semisolid blank need not be manufactured separately in this method Material, and the n on-dendritic of microstructure of semisolid is realized during the reheating before semi-solid-state shaping and forms semi-solid blank, Reduce 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.
The method that semi-solid isothermal heat-treatment prepares magnesium alloy semi-solid state blank is successfully used for Mg-Al, Mg-Zn, Mg-RE It is alloy, wherein Mg-RE systems magnesium-rare earth belongs to high-strength heat-resisting magnesium alloy.At present, magnesium alloy Isothermal treatment prepares half The temperature of solid blank all using the fusion temperature higher than Mg phases, makes Mg phase partial remeltings form semi-solid state for liquid phase, So as to obtain semi-solid blank, and then carry out semi-solid-state shaping.However, due to Mg in Mg-RE series high strength magnesium-rare earths Fusing point is higher, this cause semi-solid isothermal heat-treatment prepare the temperature of semi-solid blank and the temperature of corresponding semi-solid-state shaping compared with Height, usually above 600 DEG C(For example, high " the Microstructure evolution during reheating of of heap of stone delivered Extruded Mg-Gd-Y-Zr alloy into semisolid state ",《Transactions of Nonferrous Metals Society of China》2010 1585-1590 pages of volume 20;Guohua Wu are delivered “Microstructure evolution of semi-solid Mg-10Gd-3Y-0.5Zr alloy during Isothermal heat treatment ",《Journal of Magnesium and alloys》39- of volume 1 in 2013 Page 46), cause the risk that magnesium alloy is aoxidized and burnt to increase, and then the quality for reducing magnesium alloy finished product reduces, and increases semisolid The energy consumption and production cost of shaping.Therefore, the Mg-RE systems magnesium alloy of new semi-solid-state shaping is developed, reduces Isothermal treatment The temperature of magnesium alloy semi-solid state blank is prepared, and then reduces the temperature of semi-solid-state shaping, is to need to solve the problems, such as at present.
The content of the invention
It is an object of the invention to overcome the shortcomings of existing research, there is provided a kind of semi-solid-state shaping Mg-Gd-Zn-Ni-Zr Magnesium-rare earth and its preparation method of semi-solid blank, technical support is provided for the semi-solid-state shaping of magnesium-rare earth.
The present invention is achieved by the following technical solutions:
Magnesium alloy for semi-solid forming involved in the present invention, be a kind of Mg-Gd-Zn-Ni-Zr magnesium-rare earths, its into It is grouped into(By weight percentage)For:Gd:15~21%, Zn:2.0~3.6%, Ni:0~0.5%, Zr:0.3~0.7%, remaining For Mg.
The preparation method of magnesium alloy semi-solid state blank involved in the present invention, comprises the following steps:
The first step, dispensing:Using pure Mg, pure Gd, pure Zn, pure Ni and Mg-30wt.%Zr intermediate alloys as raw material, according to upper State magnesium alloy formula dispensing.
Second step, fusing:Temperature rises to 750 DEG C after Mg is melted, and after adding pure Gd, pure Zn, pure Ni, then heats to 780 DEG C of 120 min of insulation, afterwards by molten metal uniform stirring;Then treat that temperature is down to 750 DEG C, add among 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 that second step is obtained, 10 min are incubated at 710 DEG C, afterwards with 5~20 DEG C/s Cooling velocity cooling, obtain master alloy ingot after solidification.
4th step, Isothermal treatment:The master alloy ingot that 3rd step obtains is placed in heat-treatment furnace, melted less than Mg phases Temperature and be heat treatment temperature higher than an optional temperature within the temperature range of eutectic structure fusion temperature, progress Isothermal Hot Processing, soaking time are 5~45min, and water quenching afterwards obtains magnesium alloy semi-solid state blank.
The optimum value of the heat treatment temperature is higher than 20~30 DEG C of eutectic structure fusion temperature;The soaking time Optimum value is 20min.For soaking time depending on heat treatment temperature, temperature is higher, and soaking time is shorter.
The magnesium alloy of semi-solid-state shaping provided by the invention, belong to Mg-RE series high strength magnesium alloys, its semi-solid-state shaping Temperature is low, and the sensitiveness that solid concentration varies with temperature is low, gained solid phase particles roundness is high;Semisolid blank provided by the invention The preparation method of material, preparation temperature is low, aoxidizes and burns less, process is easily controlled, is adapted to prepare using semi-solid forming technology High intensity, complex-shaped magnesium alloy parts.
Brief description of the drawings
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.
Embodiment
Embodiments of the invention are elaborated below in conjunction with the accompanying drawings:The present embodiment using technical solution of the present invention before Put and implemented, give detailed embodiment and specific operating process.
Embodiment 1:Mg-15Gd-2Zn-0.5Ni-0.3Zr alloys, 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 the alloy comprises the following steps:
The first step, dispensing:Using pure Mg, pure Gd, pure Zn, pure Ni and Mg-30wt.%Zr intermediate alloys as raw material, according to Mg-15Gd-2Zn-0.5Ni-0.3Zr alloy formula dispensings.
Second step, fusing:Temperature rises to 750 DEG C after Mg is melted, and after adding pure Gd, pure Zn, pure Ni, then heats to 780 DEG C of 120 min of insulation, afterwards by molten metal uniform stirring;Then treat that temperature is down to 750 DEG C, add among 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 that second step is obtained, 10 min are incubated at 710 DEG C, afterwards with 20 DEG C/s's Cooling velocity is cooled down, and master alloy ingot is obtained after solidification.
4th step, Isothermal treatment:Heat analysis result shows, the eutectic structure fusion temperature of master alloy ingot obtained by the 3rd step For 512 DEG C, and the temperature of Mg phase fusion temperatures is 591 DEG C;It is being less than Mg phase fusion temperatures higher than eutectic structure fusion temperature Temperature range, select 532 DEG C be heat treatment temperature, progress Isothermal treatment, soaking time 20min, water quenching afterwards 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 blanks, and wherein white is Mg phase solid phase particles, roundness 0.83, volume fraction 70%, and black is eutectic structure.Fig. 1 shows prepared Mg- 15Gd-2Zn-0.5Ni-0.3Zr alloy semi-solid blanks have excellent microstructure of semisolid.
Embodiment 2:Mg-15Gd-2.8Zn-0.3Ni-0.5Zr alloys, 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 the alloy comprises the following steps:
The first step, dispensing:Using pure Mg, pure Gd, pure Zn, pure Ni and Mg-30wt.%Zr intermediate alloys as raw material, according to Mg-15Gd-2.8Zn-0.3Ni-0.5Zr alloy formula dispensings.
Second step, fusing:Temperature rises to 750 DEG C after Mg is melted, and after adding pure Gd, pure Zn, pure Ni, then heats to 780 DEG C of 120 min of insulation, afterwards by molten metal uniform stirring;Then treat that temperature is down to 750 DEG C, add among 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 that second step is obtained, 10 min are incubated at 710 DEG C, afterwards with 10 DEG C/s's Cooling velocity is cooled down, and master alloy ingot is obtained after solidification.
4th step, Isothermal treatment:Heat analysis result shows, the eutectic structure fusion temperature of master alloy ingot obtained by the 3rd step For 508 DEG C, and the temperature of Mg phase fusion temperatures is 586 DEG C;It is being less than Mg phase fusion temperatures higher than eutectic structure fusion temperature Temperature range, select 533 DEG C be heat treatment temperature, progress Isothermal treatment, soaking time 20min, water quenching afterwards 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 blanks, and wherein white is Mg phase solid phase particles, roundness 0.84, volume fraction 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 alloys, wherein Gd:15%, Zn:3.6%, Zr:0.7% (Weight hundred Divide ratio), remaining is Mg.
The preparation method of the semi-solid blank of the alloy comprises the following steps:
The first step, dispensing:Using pure Mg, pure Gd, pure Zn and Mg-30wt.%Zr intermediate alloys as raw material, according to Mg- 15Gd-3.6Zn-0.7Zr alloy formula dispensings.
Second step, fusing:Temperature rises to 750 DEG C after Mg is melted, and after adding pure Gd, pure Zn, then heats to 780 DEG C of guarantors 120 min of temperature, afterwards by molten metal uniform stirring;Then treat that temperature is down to 750 DEG C, add Mg-30wt.%Zr intermediate alloys, and Be incubated 30min, last uniform stirring and obtain the uniform metal liquid of composition.
3rd step, solidification:The metal liquid that second step is obtained, 10 min are incubated at 710 DEG C, afterwards with the cold of 5 DEG C/s But speed is cooled down, and master alloy ingot is obtained after solidification.
4th step, Isothermal treatment:Heat analysis result shows, the eutectic structure fusion temperature of master alloy ingot obtained by the 3rd step For 502 DEG C, and the temperature of Mg phase fusion temperatures is 583 DEG C;It is being less than Mg phase fusion temperatures higher than eutectic structure fusion temperature Temperature range, select 532 DEG C be heat treatment temperature, progress Isothermal treatment, soaking time 20min, water quenching afterwards Obtain magnesium alloy semi-solid state blank.
Fig. 3 is the microcosmic microscopic structure of Mg-15Gd-3.6Zn-0.7Zr alloy semi-solid blanks, wherein white is solid for Mg phases Phase particle, roundness 0.83, volume fraction 60%, and black is eutectic structure.Fig. 3 shows prepared Mg-15Gd- 3.6Zn-0.7Zr alloy semi-solid blanks have excellent microstructure of semisolid.
Embodiment 4:Mg-18Gd-2Zn-0.5Ni-0.3Zr alloys, 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 the alloy comprises the following steps:
The first step, dispensing:Using pure Mg, pure Gd, pure Zn, pure Ni and Mg-30wt.%Zr intermediate alloys as raw material, according to Mg-18Gd-2Zn-0.5Ni-0.3Zr alloy formula dispensings.
Second step, fusing:Temperature rises to 750 DEG C after Mg is melted, and after adding pure Gd, pure Zn, pure Ni, then heats to 780 DEG C of 120 min of insulation, afterwards by molten metal uniform stirring;Then treat that temperature is down to 750 DEG C, add among 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 that second step is obtained, 10 min are incubated at 710 DEG C, afterwards with 20 DEG C/s's Cooling velocity is cooled down, and master alloy ingot is obtained after solidification.
4th step, Isothermal treatment:Heat analysis result shows, the eutectic structure fusion temperature of master alloy ingot obtained by the 3rd step For 503 DEG C, and the temperature of Mg phase fusion temperatures is 586 DEG C;It is being less than Mg phase fusion temperatures higher than eutectic structure fusion temperature Temperature range, select 523 DEG C be heat treatment temperature, progress Isothermal treatment, soaking time 20min, water quenching afterwards 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 blanks, and wherein white is Mg phase solid phase particles, roundness 0.83, volume fraction 70%, and black is eutectic structure.Fig. 4 shows prepared Mg- 18Gd-2Zn-0.5Ni-0.3Zr alloy semi-solid blanks have excellent microstructure of semisolid.
Embodiment 5:Mg-18Gd-2.8Zn-0.3Ni-0.5Zr alloys, 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 the alloy comprises the following steps:
The first step, dispensing:Using pure Mg, pure Gd, pure Zn, pure Ni and Mg-30wt.%Zr intermediate alloys as raw material, according to Mg-18Gd-2.8Zn-0.3Ni-0.5Zr alloy formula dispensings.
Second step, fusing:Temperature rises to 750 DEG C after Mg is melted, and after adding pure Gd, pure Zn, pure Ni, then heats to 780 DEG C of 120 min of insulation, afterwards by molten metal uniform stirring;Then treat that temperature is down to 750 DEG C, add among 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 that second step is obtained, 10 min are incubated at 710 DEG C, afterwards with 10 DEG C/s's Cooling velocity is cooled down, and master alloy ingot is obtained after solidification.
4th step, Isothermal treatment:Heat analysis result shows, the eutectic structure fusion temperature of master alloy ingot obtained by the 3rd step For 499 DEG C, and the temperature of Mg phase fusion temperatures is 581 DEG C;It is being less than Mg phase fusion temperatures higher than eutectic structure fusion temperature Temperature range, select 524 DEG C be heat treatment temperature, progress Isothermal treatment, soaking time 20min, water quenching afterwards 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 blanks, and wherein white is Mg phase solid phase particles, roundness 0.84, volume fraction 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 alloys, wherein Gd:18%, Zn:3.6%, Zr:0.7% (Weight hundred Divide ratio), remaining is Mg.
The preparation method of the semi-solid blank of the alloy comprises the following steps:
The first step, dispensing:Using pure Mg, pure Gd, pure Zn and Mg-30wt.%Zr intermediate alloys as raw material, according to Mg- 18Gd-3.6Zn-0.7Zr alloy formula dispensings.
Second step, fusing:Temperature rises to 750 DEG C after Mg is melted, and after adding pure Gd, pure Zn, then heats to 780 DEG C of guarantors 120 min of temperature, afterwards by molten metal uniform stirring;Then treat that temperature is down to 750 DEG C, add Mg-30wt.%Zr intermediate alloys, and Be incubated 30min, last uniform stirring and obtain the uniform metal liquid of composition.
3rd step, solidification:The metal liquid that second step is obtained, 10 min are incubated at 710 DEG C, afterwards with the cold of 5 DEG C/s But speed is cooled down, and master alloy ingot is obtained after solidification.
4th step, Isothermal treatment:Heat analysis result shows, the eutectic structure fusion temperature of master alloy ingot obtained by the 3rd step For 493 DEG C, and the temperature of Mg phase fusion temperatures is 578 DEG C;It is being less than Mg phase fusion temperatures higher than eutectic structure fusion temperature Temperature range, select 523 DEG C be heat treatment temperature, progress Isothermal treatment, soaking time 20min, water quenching afterwards Obtain magnesium alloy semi-solid state blank.
Fig. 6 is the microcosmic microscopic structure of Mg-18Gd-3.6Zn-0.7Zr alloy semi-solid blanks, wherein white is solid for Mg phases Phase particle, roundness 0.83, volume fraction 60%, and black is eutectic structure.Fig. 6 shows prepared Mg-18Gd- 3.6Zn-0.7Zr alloy semi-solid blanks have excellent microstructure of semisolid.
Embodiment 7:Mg-21Gd-2Zn-0.5Ni-0.3Zr alloys, 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 the alloy comprises the following steps:
The first step, dispensing:Using pure Mg, pure Gd, pure Zn, pure Ni and Mg-30wt.%Zr intermediate alloys as raw material, according to Mg-21Gd-2Zn-0.5Ni-0.3Zr alloy formula dispensings.
Second step, fusing:Temperature rises to 750 DEG C after Mg is melted, and after adding pure Gd, pure Zn, pure Ni, then heats to 780 DEG C of 120 min of insulation, afterwards by molten metal uniform stirring;Then treat that temperature is down to 750 DEG C, add among 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 that second step is obtained, 10 min are incubated at 710 DEG C, afterwards with 20 DEG C/s's Cooling velocity is cooled down, and master alloy ingot is obtained after solidification.
4th step, Isothermal treatment:Heat analysis result shows, the eutectic structure fusion temperature of master alloy ingot obtained by the 3rd step For 498 DEG C, and the temperature of Mg phase fusion temperatures is 579 DEG C;It is being less than Mg phase fusion temperatures higher than eutectic structure fusion temperature Temperature range, select 518 DEG C be heat treatment temperature, progress Isothermal treatment, soaking time 20min, water quenching afterwards 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 blanks, and wherein white is Mg phase solid phase particles, roundness 0.83, volume fraction 70%, and black is eutectic structure.Fig. 7 shows prepared Mg- 21Gd-2Zn-0.5Ni-0.3Zr alloy semi-solid blanks have excellent microstructure of semisolid.
Embodiment 8:Mg-21Gd-2.8Zn-0.3Ni-0.5Zr alloys, 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 the alloy comprises the following steps:
The first step, dispensing:Using pure Mg, pure Gd, pure Zn, pure Ni and Mg-30wt.%Zr intermediate alloys as raw material, according to Mg-21Gd-2.8Zn-0.3Ni-0.5Zr alloy formula dispensings.
Second step, fusing:Temperature rises to 750 DEG C after Mg is melted, and after adding pure Gd, pure Zn, pure Ni, then heats to 780 DEG C of 120 min of insulation, afterwards by molten metal uniform stirring;Then treat that temperature is down to 750 DEG C, add among 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 that second step is obtained, 10 min are incubated at 710 DEG C, afterwards with 10 DEG C/s's Cooling velocity is cooled down, and master alloy ingot is obtained after solidification.
4th step, Isothermal treatment:Heat analysis result shows, the eutectic structure fusion temperature of master alloy ingot obtained by the 3rd step For 496 DEG C, and the temperature of Mg phase fusion temperatures is 577 DEG C;It is being less than Mg phase fusion temperatures higher than eutectic structure fusion temperature Temperature range, select 521 DEG C be heat treatment temperature, progress Isothermal treatment, soaking time 20min, water quenching afterwards 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 blanks, and wherein white is Mg phase solid phase particles, roundness 0.84, volume fraction 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 alloys, wherein Gd:21%, Zn:3.6%, Zr:0.7% (Weight hundred Divide ratio), remaining is Mg.
The preparation method of the semi-solid blank of the alloy comprises the following steps:
The first step, dispensing:Using pure Mg, pure Gd, pure Zn and Mg-30wt.%Zr intermediate alloys as raw material, according to Mg- 21Gd-3.6Zn-0.7Zr alloy formula dispensings.
Second step, fusing:Temperature rises to 750 DEG C after Mg is melted, and after adding pure Gd, pure Zni, then heats to 780 DEG C 120 min are incubated, afterwards by molten metal uniform stirring;Then treat that temperature is down to 750 DEG C, add Mg-30wt.%Zr intermediate alloys, And be incubated 30min, last uniform stirring and obtain the uniform metal liquid of composition.
3rd step, solidification:The metal liquid that second step is obtained, 10 min are incubated at 710 DEG C, afterwards with the cold of 5 DEG C/s But speed is cooled down, and master alloy ingot is obtained after solidification.
4th step, Isothermal treatment:Heat analysis result shows, the eutectic structure fusion temperature of master alloy ingot obtained by the 3rd step For 488 DEG C, and the temperature of Mg phase fusion temperatures is 571 DEG C;It is being less than Mg phase fusion temperatures higher than eutectic structure fusion temperature Temperature range, select 518 DEG C be heat treatment temperature, progress Isothermal treatment, soaking time 20min, water quenching afterwards Obtain magnesium alloy semi-solid state blank.
Fig. 9 is the microcosmic microscopic structure of Mg-21Gd-3.6Zn-0.7Zr alloy semi-solid blanks, wherein white is solid for Mg phases Phase particle, roundness 0.83, volume fraction 60%, and black is eutectic structure.Fig. 9 shows prepared Mg-21Gd- 3.6Zn-0.7Zr alloy semi-solid blanks have excellent microstructure of semisolid.

Claims (4)

  1. A kind of 1. semi-solid-state shaping Mg-Gd-Zn-Ni-Zr magnesium alloys, it is characterised in that:Its weight percent composition forms: 15~21% Gd, 2.0~3.6% Zn, 0~0.5% Ni, 0.3~0.7% Zr, surplus Mg.
  2. 2. semi-solid-state shaping Mg-Gd-Zn-Ni-Zr magnesium alloys according to claim 1, it is characterised in that:Alloy is by Mg phases Formed with eutectic structure.
  3. 3. a kind of semi-solid-state shaping preparation method of Mg-Gd-Zn-Ni-Zr magnesium alloy semi-solid state blanks, comprises the following steps:
    The first step, dispensing:, will according to right using pure Mg, pure Gd, pure Zn, pure Ni and Mg-30wt.%Zr intermediate alloys as raw material Seek the 1 magnesium alloy formula dispensing;
    Second step, fusing:Temperature rises to 750 DEG C after Mg is melted, and after adding pure Gd, pure Zn, pure Ni, then heats to 780 DEG C 120 min are incubated, afterwards by molten metal uniform stirring;Then treat that temperature is down to 750 DEG C, add Mg-30wt.%Zr intermediate alloys, And be incubated 30min, last uniform stirring and obtain the uniform metal liquid of composition;
    3rd step, solidification:The metal liquid that second step is obtained, 10 min are incubated at 710 DEG C, afterwards with the cold of 5~20 DEG C/s But speed is cooled down, and master alloy ingot is obtained after solidification;
    4th step, Isothermal treatment:The master alloy ingot that 3rd step obtains is placed in heat-treatment furnace, melted higher than eutectic structure Temperature and carry out Isothermal treatment less than an optional temperature within the temperature range of Mg phase fusion temperatures, be incubated 5~45min, it Water quenching obtains magnesium alloy semi-solid state blank afterwards.
  4. 4. the preparation side of semi-solid-state shaping Mg-Gd-Zn-Ni-Zr magnesium alloy semi-solid state blanks according to claim 3 Method, in the 4th step, the optimum temperature of Isothermal treatment is to be higher than 20~30 DEG C of eutectic structure fusion temperature, optimal soaking time 20min。
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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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