CN109957693B - High-strontium high-aluminum-content cast magnesium-based composite material and preparation method thereof - Google Patents

High-strontium high-aluminum-content cast magnesium-based composite material and preparation method thereof Download PDF

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CN109957693B
CN109957693B CN201910238157.0A CN201910238157A CN109957693B CN 109957693 B CN109957693 B CN 109957693B CN 201910238157 A CN201910238157 A CN 201910238157A CN 109957693 B CN109957693 B CN 109957693B
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magnesium
composite material
based composite
strontium
content
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CN109957693A (en
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潘虎成
秦高梧
李景仁
任玉平
杨延涛
李松
左良
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Northeastern University China
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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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C30/00—Alloys containing less than 50% by weight of each constituent
    • C22C30/06—Alloys containing less than 50% by weight of each constituent containing zinc

Abstract

The magnesium-based composite material comprises, by mass, 2.00-35.00% of Sr, 3.00-25.00% of Al, 0.00-3.00% of Ca, 0.00-8.00% of Ba, 0.00-8.00% of Zn, 0.00-5.00% of Mn, 0.00-8.00% of Sn and the balance of Mg and impurities17Sr2、Al2Sr、Al4Sr phase using Al2The Sr phase has the characteristics of strong plasticity and good combination with a magnesium matrix interface, and a high-performance composite material is prepared. The invention adopts common casting, has simple process flow, regulates and controls the content and the shape of eutectic structures by regulating and controlling components, and further improves the performance.

Description

High-strontium high-aluminum-content cast magnesium-based composite material and preparation method thereof
Technical Field
The invention belongs to the field of magnesium alloy and magnesium-based composite materials, and particularly relates to a cast magnesium-based composite material with high strontium content and high aluminum content and a preparation method thereof.
Background
In recent years, energy crisis, resource exhaustion and environmental deterioration have made higher demands on light weight, energy saving and emission reduction, low carbon and environmental protection of aerospace and automobile industries. Magnesium alloys have been receiving wide attention due to their excellent properties such as low density, high specific strength and high specific stiffness, and have become an important research in the research of metal structural materials in recent yearsAnd (4) direction. Most of the related research work in the early period focuses on the toughness research of magnesium alloy: the solid solution strengthening and precipitation strengthening are realized by adding alloy elements such as aluminum, zinc and the like which have larger maximum solid solubility in magnesium and obviously change along with the temperature; the crystal grains are refined by adding elements such as zirconium, manganese, silver, silicon and the like, so that the aim of toughness and toughness is fulfilled; the alloy structure is regulated and controlled by regulating and controlling the solidification rate, the processing technology and the heat treatment technology. However, when magnesium alloys are used in more complex shaped components, casting becomes the only forming method. The commercial cast magnesium alloy is AZ80, AZ91D and other brands at present, and is characterized by high aluminum and low zinc content, and the second phase in the alloy is mainly gamma-Mg17Al12And the AZ series casting magnesium alloy material has a hot cracking tendency due to the lower melting point (437 ℃) of the gamma phase and is not suitable for long-time service under the condition of higher than 150 ℃. At present, Mg-RE magnesium alloy has higher room temperature strength and high temperature strength and can be used as heat-resistant magnesium alloy, but the high content of rare earth elements not only obviously increases the cost of the magnesium alloy, but also increases the density of the alloy, thereby greatly weakening the advantage of the magnesium alloy as a light-weight material. In recent years, many researches on novel non-rare earth wrought magnesium alloys, particularly on adding elements such as Sr, Ca, Al, Zn, Mn, Ba, Sn and the like into magnesium alloys, have attracted extensive attention, and magnesium alloy materials with high toughness can be prepared, but the researches on cast non-rare earth magnesium alloy materials are slow.
The eutectic structure is a structure that is ubiquitous in steel materials, typically pearlite. At present, the added alloy elements in the non-rare earth magnesium alloy are generally not more than 10 percent (mass percentage), most of the design ideas of strengthening the magnesium alloy material also imitate the aluminum alloy material, namely, a micro-alloying, solid solution and aging heat treatment process is adopted to obtain a fine second phase precipitated at high density, for example, the size and the shape of the precipitated phase in the Mg-Zn alloy are regulated and controlled by the micro-alloying elements such as Ag, Ca, Zr and the like and the solid solution and aging heat treatment process, however, the design of the magnesium alloy material with a large amount of eutectic structures and even complete eutectic structures is fresh.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a cast magnesium-based composite material with high strontium content and high aluminum content and a preparation method thereof.
The cast magnesium-based composite material with high strontium content and high aluminum content is characterized by comprising the following components in percentage by mass: sr: 2.00-35.00%; al: 3.00-25.00%; ca: 0.00-3.00%; ba: 0.00-8.00%; zn: 0.00-8.00%; mn: 0.00-5.00%; sn: 0.00-8.00%, and the balance of Mg and impurities.
The Sr is magnesium-strontium intermediate alloy, the Al is pure aluminum, the Ca is magnesium-calcium intermediate alloy, and the Ba is pure barium.
The Zn is pure zinc, the Mn is magnesium-manganese intermediate alloy, and the Sn is pure tin.
The high-strontium high-aluminum-content cast magnesium-based composite material comprises the following components in percentage by mass: ca: 0.50 to 3.00 percent.
The high-strontium high-aluminum-content cast magnesium-based composite material comprises the following components in percentage by mass: ba: 1.00-8.00%.
The high-strontium high-aluminum-content cast magnesium-based composite material comprises the following components in percentage by mass: zn: 0.50 to 8.00 percent.
The high-strontium high-aluminum-content cast magnesium-based composite material comprises the following components in percentage by mass: mn: 0.10 to 5.00 percent.
The high-strontium high-aluminum-content cast magnesium-based composite material comprises the following components in percentage by mass: sn: 1.50-8.00%.
The preparation method of the cast magnesium-based composite material with high strontium content and high aluminum content comprises the following steps:
(1) preparing raw materials:
weighing required raw materials according to the mass percentage of the components of the casting magnesium-based composite material with high strontium content and high aluminum content;
(2) smelting of cast ingots:
firstly, adding magnesium under the protection of protective gas in a smelting device, heating to 750-800 ℃, and fully stirring until the magnesium is completely molten;
and then keeping the temperature at 750-800 ℃, sequentially adding other weighed raw materials in batches, fully stirring for 2-8 minutes, controlling the temperature of the molten liquid at 700-750 ℃, standing for 12-24 minutes, removing floating slag on the surface, casting the molten liquid into an iron mold preheated to 200-350 ℃ in advance at 700-750 ℃, and cooling to room temperature to obtain the high-strontium and high-aluminum cast magnesium-based composite material.
The preparation method of the high-strontium high-aluminum-content cast magnesium-based composite material comprises the step (2) of taking CO as protective gas2+SF6Or high purity argon, said CO2And SF6The volume ratio of (19-199): 1.
the invention has the beneficial effects that the raw materials of the high-strontium high-aluminum content casting magnesium-based composite material are all metal and alloy with lower price, and have certain cost advantage, compared with the conventional magnesium-based composite material, the reinforcement formed by the invention is an in-situ self-generated reinforcement and is uniformly dispersed, compared with the conventional magnesium-aluminum-strontium magnesium alloy, the invention has higher Sr and Al element content and forms eutectic structures, and the eutectic structure phase comprises α -Mg and Mg17Sr2、Al2Sr、Al4Sr phase using Al2The Sr phase has the characteristics of strong plasticity and good combination with a magnesium matrix interface, and a high-performance composite material is prepared. The invention adopts common casting, has simple process flow, regulates and controls the content and the shape of eutectic structures by regulating and controlling components, and further improves the performance.
Drawings
FIG. 1(a) is the casting structure morphology of Mg-2Sr-3Al-0.1Mn alloy under a metallographic microscope, and FIG. 1(b) is the casting structure morphology of Mg-2Sr-3Al-0.1Mn alloy under a scanning electron microscope.
FIG. 2(a) is the casting structure morphology of Mg-4Sr-6Al-0.5Zn alloy under a metallographic microscope, and FIG. 2(b) is the casting structure morphology of Mg-4Sr-6Al-0.5Zn alloy under a scanning electron microscope.
FIG. 3(a) is the Mg-5Sr-5Al-3Zn alloy casting structure morphology under the metallographic microscope, and FIG. 3(b) is the Mg-5Sr-5Al-3Zn alloy casting structure morphology under the scanning electron microscope.
FIG. 4(a) is the cast structure morphology of Mg-6Sr-4Al-3Ca alloy under a metallographic microscope, and FIG. 4(b) is the cast structure morphology of Mg-6Sr-4Al-3Ca alloy under a scanning electron microscope.
FIG. 5(a) is the casting structure morphology of Mg-7.5Sr-2.5Al-8Ba alloy under a metallographic microscope, and FIG. 5(b) is the casting structure morphology of Mg-7.5Sr-2.5Al-8Ba alloy under a scanning electron microscope.
FIG. 6 is a graph showing mechanical properties of each sample in the test examples.
Detailed Description
For better understanding of the present invention, the technical solutions and effects of the present invention will be described in detail by the following embodiments with reference to the accompanying drawings.
Metal matrix composites have gained recent interest from materials researchers, such as Y additions to aluminum alloys2O3Graphene is added into the copper alloy, and carbon nano tubes and the like are added into the magnesium alloy. Most metal matrix composite materials are prepared by adopting a method of adding a reinforcement, complex adding and dispersing processes are needed, for example, a powder metallurgy process is adopted for adding graphene into a copper alloy, an ultrasonic melt dispersing process is needed for adding a carbon nano tube into a magnesium alloy, and the like, the performance of the reinforcement in a magnesium matrix and the interface effect with the matrix are considered, and a magnesium alloy containing an eutectic structure is obtained by selecting cheap non-rare earth elements with low density, so that the preparation method is an idea for preparing a high-performance casting magnesium matrix composite material, and has the advantages of in-situ self-generation and uniform dispersion of a complex. The recent research results of the applicant show that Sr and Al are used as main alloying elements, and Ca, Ba, Zn, Mn and Sn are used as micro-alloying elements, so that the mechanical property of the cast magnesium alloy can achieve a satisfactory effect, and a novel cast magnesium-based composite material and a novel cast magnesium-based composite product with low cost and high mechanical property are developed.
The design idea of the invention is as follows:
designing the contents of main alloy elements Sr and Al by combining a phase diagram, adjusting micro-alloying elements such as Ca, Ba, Zn, Mn, Sn and the like, casting by adopting a casting system to obtain magnesium-based composite materials with different eutectic structure contents and appearances, and finally preparing the cast magnesium-based composite material with high strontium content and high aluminum content.
Example 1
A high-strontium high-aluminum content cast magnesium-based composite material comprises the following components in percentage by mass: sr: 2 wt.%, Al: 3 wt.%, Mn: 0.1 wt.%, with the balance Mg and impurities; wherein Mn is a magnesium-manganese intermediate alloy with the Mn content accounting for 6 wt.%, and the purity of other metals is more than 99%.
A preparation method of a cast magnesium-based composite material with high strontium content and high aluminum content comprises the following steps:
(1) preparing raw materials:
weighing required raw materials according to the mass percentage of the components of the casting magnesium-based composite material with high strontium content and high aluminum content;
(2) smelting of cast ingots:
first, CO is introduced into the smelting unit2+SF6Under the protection of protective gas, adding pure magnesium, heating to 750 deg.C, stirring thoroughly until it is completely molten, and adding CO2And SF6199 in volume ratio: 1;
then, keeping the temperature at 750 ℃, adding other weighed raw materials in batches in sequence, fully stirring for 2 minutes, controlling the temperature of the molten liquid at 700 ℃, standing for 12 minutes, removing the scum on the surface, casting the molten liquid into an iron mold preheated to 200 ℃ in advance under the condition of 700 ℃, and cooling to room temperature to prepare the high-strontium high-aluminum-content cast magnesium-based composite material, wherein the microstructure of the composite material is shown in fig. 1(a) and fig. 1(b), and the mechanical property of the composite material is shown in fig. 6.
The cast magnesium-based composite material with high strontium content and high aluminum content prepared by the embodiment has the tensile strength of 131.3MPa, the yield strength of 98.2MPa and the elongation of 3.2%.
Example 2
A high-strontium high-aluminum content cast magnesium-based composite material comprises the following components in percentage by mass: sr: 4 wt.%, Al: 6 wt.%, Zn: 0.5 wt.%, with the balance Mg and impurities; wherein the purity of each metal is more than 99%.
A preparation method of a cast magnesium-based composite material with high strontium content and high aluminum content comprises the following steps:
(1) preparing raw materials:
weighing required raw materials according to the mass percentage of the components of the casting magnesium-based composite material with high strontium content and high aluminum content;
(2) smelting of cast ingots:
first, CO is introduced into the smelting unit2+SF6Under the protection of protective gas, adding pure magnesium, heating to 760 ℃, fully stirring until the pure magnesium is completely melted, and adding CO2And SF6The volume ratio is 168: 1;
then, keeping the temperature at 760 ℃, adding other weighed raw materials in batches in sequence, fully stirring for 3 minutes, controlling the temperature of the molten liquid at 710 ℃, standing for 14 minutes, removing the scum on the surface, casting the molten liquid into an iron mold preheated to 220 ℃ in advance under the condition of 710 ℃, and cooling to room temperature to prepare the high-strontium high-aluminum-content cast magnesium-based composite material, wherein the microstructure of the composite material is shown in fig. 2(a) and 2(b), and the mechanical property of the composite material is shown in fig. 6.
The cast Mg-based composite material with high strontium content and high aluminum content prepared by the embodiment has the tensile strength of 161.7MPa, the yield strength of 114.3MPa and the elongation of 5.1 percent.
Example 3
A high-strontium high-aluminum content cast magnesium-based composite material comprises the following components in percentage by mass: sr: 5 wt.%, Al: 5 wt.%, Zn: 3 wt.%, the remainder Mg and impurities; wherein the purity of each metal is more than 99%.
A preparation method of a cast magnesium-based composite material with high strontium content and high aluminum content comprises the following steps:
(1) preparing raw materials:
weighing required raw materials according to the mass percentage of the components of the casting magnesium-based composite material with high strontium content and high aluminum content;
(2) smelting of cast ingots:
first, CO is introduced into the smelting unit2+SF6Adding pure magnesium under the protection of protective gas, heating to 770 deg.C, and chargingStirring until it is completely melted, and said CO2And SF6According to the volume ratio of 152: 1;
then, keeping the temperature at 770 ℃, adding other weighed raw materials in batches in sequence, fully stirring for 4 minutes, controlling the temperature of the molten liquid at 720 ℃, standing for 16 minutes, removing scum on the surface, casting the molten liquid into an iron mold preheated to 240 ℃ in advance under the condition of 720 ℃, and cooling to room temperature to prepare the high-strontium high-aluminum-content cast magnesium-based composite material, wherein the microstructure of the composite material is shown in fig. 3(a) and 3(b), and the mechanical property of the composite material is shown in fig. 6.
The cast magnesium-based composite material with high strontium content and high aluminum content prepared by the embodiment has the tensile strength of 134.0MPa, the yield strength of 101.0MPa and the elongation of 2.2 percent.
Example 4
A high-strontium high-aluminum content cast magnesium-based composite material comprises the following components in percentage by mass: sr: 6 wt.%, Al: 4 wt.%, Ca: 3 wt.%, the remainder Mg and impurities; wherein the purity of each metal is more than 99%.
A preparation method of a cast magnesium-based composite material with high strontium content and high aluminum content comprises the following steps:
(1) preparing raw materials:
weighing required raw materials according to the mass percentage of the components of the casting magnesium-based composite material with high strontium content and high aluminum content;
(2) smelting of cast ingots:
first, CO is introduced into the smelting unit2+SF6Under the protection of protective gas, adding pure magnesium, heating to 780 deg.C, stirring thoroughly until it is completely melted, and adding CO2And SF6According to the volume ratio of 143: 1;
then, the temperature is maintained at 780 ℃, other weighed raw materials are sequentially added in batches, after the mixture is fully stirred for 5 minutes, the temperature of the molten liquid is controlled at 730 ℃, the mixture is kept still for 18 minutes, the scum on the surface is removed, the mixture is cast into an iron mold preheated to 260 ℃ in advance under the condition of 730 ℃, and the mixture is cooled to the room temperature, so that the high-strontium and high-aluminum content cast magnesium-based composite material is prepared, the microstructure of the composite material is shown in fig. 4(a) and 4(b), and the mechanical property of the composite material is shown in fig. 6.
The cast magnesium-based composite material with high strontium content and high aluminum content prepared by the embodiment has the tensile strength of 152.0MPa, the yield strength of 112.0MPa and the elongation of 3.0 percent.
Example 5
A high-strontium high-aluminum content cast magnesium-based composite material comprises the following components in percentage by mass: sr: 7.5 wt.%, Al: 2.5 wt.%, Ba: 8 wt.%, the remainder Mg and impurities; wherein the purity of each metal is more than 99%.
A preparation method of a cast magnesium-based composite material with high strontium content and high aluminum content comprises the following steps:
(1) preparing raw materials:
weighing required raw materials according to the mass percentage of the components of the casting magnesium-based composite material with high strontium content and high aluminum content;
(2) smelting of cast ingots:
first, CO is introduced into the smelting unit2+SF6Under the protection of protective gas, adding pure magnesium, heating to 790 ℃, fully stirring until the pure magnesium is completely melted, and adding CO2And SF6The volume ratio is 129: 1;
then, keeping the temperature at 790 ℃, adding other weighed raw materials in batches in sequence, fully stirring for 6 minutes, controlling the temperature of the molten liquid at 740 ℃, standing for 20 minutes, removing scum on the surface, casting the molten liquid into an iron mold preheated to 300 ℃ in advance under the condition of 740 ℃, and cooling to room temperature to prepare the high-strontium high-aluminum-content cast magnesium-based composite material, wherein the microstructure of the composite material is shown in fig. 5(a) and 5(b), and the mechanical property of the composite material is shown in fig. 6.
The cast magnesium-based composite material with high strontium content and high aluminum content prepared by the embodiment has the tensile strength of 170.2MPa, the yield strength of 114.0MPa and the elongation of 1.6 percent.
Example 6
A high-strontium high-aluminum content cast magnesium-based composite material comprises the following components in percentage by mass: sr: 20 wt.%, Al: 8 wt.%, Mn: 5 wt.%, the remainder being Mg and impurities; wherein Mn is a magnesium-manganese intermediate alloy with the Mn content accounting for 6 wt.%, and the purity of other metals is more than 99%.
A preparation method of a cast magnesium-based composite material with high strontium content and high aluminum content comprises the following steps:
(1) preparing raw materials:
weighing required raw materials according to the mass percentage of the components of the casting magnesium-based composite material with high strontium content and high aluminum content;
(2) smelting of cast ingots:
first, CO is introduced into the smelting unit2+SF6Under the protection of protective gas, adding pure magnesium, heating to 800 deg.C, stirring thoroughly until it is completely melted, and adding CO2And SF6According to the volume ratio of 85: 1;
then, keeping the temperature at 800 ℃, adding other weighed raw materials in batches in sequence, fully stirring for 7 minutes, controlling the temperature of the molten liquid at 750 ℃, standing for 22 minutes, removing scum on the surface, casting the molten liquid into an iron mold preheated to 350 ℃ in advance under the condition of 750 ℃, and cooling to room temperature to prepare the high-strontium high-aluminum content cast magnesium-based composite material, wherein the mechanical properties of the composite material are shown in fig. 6.
The cast magnesium-based composite material with high strontium content and high aluminum content prepared by the embodiment has the tensile strength of 168.3MPa, the yield strength of 118.0MPa and the elongation of 2.3 percent.
Example 7
A high-strontium high-aluminum content cast magnesium-based composite material comprises the following components in percentage by mass: sr: 35 wt.%, Al: 25 wt.%, Sn: 8 wt.%, Zn: 8 wt.%, the remainder Mg and impurities; wherein the purity of each metal is more than 99%.
A preparation method of a cast magnesium-based composite material with high strontium content and high aluminum content comprises the following steps:
(1) preparing raw materials:
weighing required raw materials according to the mass percentage of the components of the casting magnesium-based composite material with high strontium content and high aluminum content;
(2) smelting of cast ingots:
first, CO is introduced into the smelting unit2+SF6Under the protection of protective gas, addingPure magnesium, heated to 770 deg.C and stirred well until it is completely melted, said CO2And SF6According to the volume ratio of 53: 1;
then, keeping the temperature at 770 ℃, sequentially adding other weighed raw materials in batches, fully stirring for 8 minutes, controlling the temperature of the molten liquid at 750 ℃, standing for 24 minutes, removing scum on the surface, casting the molten liquid into an iron mold preheated to 350 ℃ in advance under the condition of 750 ℃, and cooling to room temperature to prepare the high-strontium high-aluminum content cast magnesium-based composite material, wherein the mechanical properties of the composite material are shown in fig. 6.
The cast magnesium-based composite material with high strontium content and high aluminum content prepared by the embodiment has the tensile strength of 184.7MPa, the yield strength of 120.0MPa and the elongation of 2.8 percent.
Example 8
A high-strontium high-aluminum content cast magnesium-based composite material comprises the following components in percentage by mass: sr: 22 wt.%, Al: 18 wt.%, Ca: 0.5 wt.%, with the balance Mg and impurities; wherein the purity of each metal is more than 99%.
A preparation method of a cast magnesium-based composite material with high strontium content and high aluminum content comprises the following steps:
(1) preparing raw materials:
weighing required raw materials according to the mass percentage of the components of the casting magnesium-based composite material with high strontium content and high aluminum content;
(2) smelting of cast ingots:
first, CO is introduced into the smelting unit2+SF6Under the protection of protective gas, adding pure magnesium, heating to 750 deg.C, stirring thoroughly until it is completely molten, and adding CO2And SF6185 parts by volume: 1;
and then keeping the temperature at 750 ℃, sequentially adding other weighed raw materials in batches, fully stirring for 6 minutes, controlling the temperature of the molten liquid at 740 ℃, standing for 18 minutes, removing scum on the surface, casting the molten liquid at 740 ℃ into an iron mold preheated to 300 ℃ in advance, and cooling to room temperature to obtain the high-strontium high-aluminum-content cast magnesium-based composite material.
The cast magnesium-based composite material with high strontium content and high aluminum content prepared by the embodiment has the tensile strength of 148.8MPa, the yield strength of 103.4MPa and the elongation of 2.7 percent.
Example 9
A high-strontium high-aluminum content cast magnesium-based composite material comprises the following components in percentage by mass: sr: 27 wt.%, Al: 13 wt.%, Ba: 1 wt.%, with the balance Mg and impurities; wherein the purity of each metal is more than 99%.
A preparation method of a cast magnesium-based composite material with high strontium content and high aluminum content comprises the following steps:
(1) preparing raw materials:
weighing required raw materials according to the mass percentage of the components of the casting magnesium-based composite material with high strontium content and high aluminum content;
(2) smelting of cast ingots:
first, CO is introduced into the smelting unit2+SF6Under the protection of protective gas, adding pure magnesium, heating to 780 deg.C, stirring thoroughly until it is completely melted, and adding CO2And SF6According to the volume ratio of 29: 1;
and then keeping the temperature at 780 ℃, sequentially adding other weighed raw materials in batches, fully stirring for 5 minutes, controlling the temperature of the molten liquid at 720 ℃, standing for 20 minutes, removing scum on the surface, casting the molten liquid into an iron mold preheated to 240 ℃ in advance at 720 ℃, and cooling to room temperature to obtain the high-strontium high-aluminum-content cast magnesium-based composite material.
The cast Mg-based composite material with high strontium content and high aluminum content prepared by the embodiment has the tensile strength of 153.7MPa, the yield strength of 107.6MPa and the elongation of 1.8 percent.
Example 10
A high-strontium high-aluminum content cast magnesium-based composite material comprises the following components in percentage by mass: sr: 31 wt.%, Al: 22 wt.%, Sn: 1.5 wt.%, Zn: 1.5 wt.%, with the balance Mg and impurities; wherein the purity of each metal is more than 99%.
A preparation method of a cast magnesium-based composite material with high strontium content and high aluminum content comprises the following steps:
(1) preparing raw materials:
weighing required raw materials according to the mass percentage of the components of the casting magnesium-based composite material with high strontium content and high aluminum content;
(2) smelting of cast ingots:
first, CO is introduced into the smelting unit2+SF6Under the protection of protective gas, adding pure magnesium, heating to 760 ℃, fully stirring until the pure magnesium is completely melted, and adding CO2And SF6According to the volume ratio of 19: 1;
and then keeping the temperature at 760 ℃, sequentially adding other weighed raw materials in batches, fully stirring for 7 minutes, controlling the temperature of the molten liquid at 730 ℃, standing for 16 minutes, removing scum on the surface, casting the molten liquid at 730 ℃ into an iron mold preheated to 260 ℃ in advance, and cooling to room temperature to obtain the high-strontium high-aluminum-content cast magnesium-based composite material.
The cast magnesium-based composite material with high strontium content and high aluminum content prepared by the embodiment has the tensile strength of 178.9MPa, the yield strength of 119.4MPa and the elongation of 2.5 percent.

Claims (5)

1. The cast magnesium-based composite material with high strontium content and high aluminum content is characterized by comprising the following components in percentage by mass: sr: 20.00-35.00%; al: 8.00-25.00%; ca: 0.00-3.00%; ba: 0.00-8.00%; zn: 0.00-8.00%; mn: 0.00-5.00%; sn: 0.00-8.00%, and the balance of Mg and impurities;
the preparation method of the magnesium-based composite material comprises the following steps:
(1) preparing raw materials:
weighing required raw materials according to the mass percentage of the components of the casting magnesium-based composite material with high strontium content and high aluminum content;
(2) smelting of cast ingots:
firstly, adding magnesium under the protection of protective gas in a smelting device, heating to 750-800 ℃, and fully stirring until the magnesium is completely molten; and then keeping the temperature at 750-800 ℃, sequentially adding other weighed raw materials in batches, fully stirring for 2-8 minutes, controlling the temperature of the molten liquid at 700-750 ℃, standing for 12-24 minutes, removing surface scum, casting the molten liquid into an iron mold preheated to 200-350 ℃ in advance at 700-750 ℃, and cooling to room temperature to obtain the cast magnesium-based composite material with high strontium content and high aluminum content.
2. The high-strontium high-aluminum cast magnesium-based composite material as claimed in claim 1, wherein the magnesium-based composite material comprises the following components by mass percent: sr: 20.00-35.00%; al: 8.00-25.00%; further, it contains Ca: 0.50-3.00%; ba: 1.00-8.00%; zn: 0.50-8.00%; mn: 0.10-5.00%; sn: 1.50-8.00% of one or more of the following components, and the balance of Mg and impurities.
3. The high-strontium high-aluminum cast magnesium-based composite material according to claim 1, wherein Sr in the magnesium-based composite material is made of magnesium-strontium master alloy; ca takes magnesium-calcium intermediate alloy as raw material.
4. The high-strontium high-aluminum cast magnesium-based composite material according to claim 1, wherein Mn in the magnesium-based composite material is a magnesium manganese master alloy.
5. The high strontium and high aluminum content cast magnesium-based composite material as claimed in claim 1, wherein the shielding gas in step (2) is CO2+SF6Or high purity argon, said CO2And SF6The volume ratio of (19-199): 1.
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