CN114574720B - Mg2Si reinforced magnesium-based composite material plate and preparation method thereof - Google Patents
Mg2Si reinforced magnesium-based composite material plate and preparation method thereof Download PDFInfo
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- CN114574720B CN114574720B CN202210192799.3A CN202210192799A CN114574720B CN 114574720 B CN114574720 B CN 114574720B CN 202210192799 A CN202210192799 A CN 202210192799A CN 114574720 B CN114574720 B CN 114574720B
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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
- C22C23/00—Alloys based on magnesium
- C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- 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 Mg 2 Si reinforced magnesium baseHeating and melting industrial pure Mg under the protection of argon and a covering agent, continuously heating, and then sequentially adding industrial pure Al, pure Zn, mg-xSi and Mg-xSr intermediate alloys to prepare a melt; cooling the melt to make the melt be in a semi-solid state, mechanically stirring, fishing out slag, standing, and casting to obtain a magnesium-based composite ingot modified by Sr; carrying out solution treatment on the magnesium-based composite ingot to obtain an ingot with the thickness of 10-30 cm; and carrying out heat preservation treatment on the cast ingot, and then carrying out multi-pass hot rolling to obtain the magnesium-based composite material plate. Mg is regulated and controlled by changing the addition amount and reaction time of Sr element 2 The size of Si reduces microcracks generated by stress concentration of the plate during hot processing, improves the formability of products and the yield during processing production, and improves Mg by adopting hot rolling deformation 2 Si enhances the mechanical property, especially the plasticity of the magnesium-based composite material.
Description
Technical Field
The invention belongs to the technical field of metal material preparation, and particularly relates to Mg 2 A Si reinforced magnesium-based composite material plate and a preparation method thereof.
Background
The magnesium alloy is the lightest metal structure material in engineering application and has excellent performances such as low density, high specific strength, high specific stiffness, excellent shock absorption and the like, so the magnesium alloy not only has important significance for the development of modern products, new energy, weight reduction and energy consumption reduction of vehicles, but also has key effect in the fields of aviation, aerospace, communication, electronic industry and the like. However, because the strength is low, and magnesium has a close-packed hexagonal structure, the sliding system is few, the plastic deformation capability is poor, and the high-temperature performance is poor, so that the magnesium is difficult to be directly used as a structural material.
Intermetallic compound Mg 2 Si has the advantages of high melting point, high modulus, high hardness, low thermal expansion coefficient and the like, is easy to synthesize in Mg by adopting an in-situ synthesis method, has the density close to that of a Mg matrix, is a commonly used magnesium alloy reinforcing phase, but Mg 2 The Si has larger size, stress concentration is easily generated in the deformation process to form a crack source, the formability of the composite material in the subsequent hot working process is seriously damaged, and the yield of products in the actual industrial production is reduced. Improved by adding active elementsMg 2 The size of Si is expected to reduce stress concentration in the hot working process and prevent the composite material from cracking. In addition, the mechanical property, especially the plasticity of the magnesium-based composite material can be improved by carrying out hot rolling deformation so as to meet the requirements of the mobile phone rear shell and the notebook computer rear cover on material formability, high strength and high plasticity and toughness. At present, the preparation process for improving the yield of the magnesium-based composite material is not mature. Therefore, the present invention proposes to improve Mg by modification of alloying elements 2 Si morphology, increasing Mg 2 The hot rolling formability of the Si/Mg-based composite material also improves the yield of the subsequent processing of the composite material plate, and further widens the application of the magnesium-based composite material in the field of electronic products.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a Mg element for overcoming the above-mentioned deficiencies in the prior art 2 The Si reinforced magnesium-based composite material plate and the preparation method thereof have simple process and low cost, can improve the yield and the formability of the magnesium-based composite material plate, can ensure that the magnesium-based composite material plate has good mechanical property, and can be used for manufacturing mobile phone backshells and notebook computer backshells.
The invention adopts the following technical scheme:
mg 2 The preparation method of the Si reinforced magnesium-based composite material plate comprises the steps of heating and melting industrial pure Mg under the protection of argon and a covering agent, continuously heating, and then sequentially adding industrial pure Al, pure Zn and Mg-xSi and Mg-xSr intermediate alloys to prepare a melt; cooling the melt to make the melt be in a semi-solid state, mechanically stirring, fishing out slag, standing, and casting to obtain a magnesium-based composite ingot modified by Sr; carrying out solution treatment on the magnesium-based composite ingot to obtain an ingot with the thickness of 10-30 cm; and carrying out heat preservation treatment on the cast ingot, and then carrying out multi-pass hot rolling to obtain the magnesium-based composite material plate.
Specifically, the Si content in Mg-xSi and Mg-xSr is 5% -15%, and the Sr content is 20% -40%.
Specifically, the heating and melting temperature is 660-620 ℃.
Specifically, the temperature for continuously raising the temperature is 650-600 ℃.
Specifically, the temperature of the cooling treatment is 560-650 ℃, the mechanical stirring time is 5-10 min, and the mechanical stirring speed is 150-250 r/min.
Specifically, the standing time is 10-20 min, and the pouring temperature is 600-620 ℃.
Specifically, the temperature of the solution treatment is 360-420 ℃, and the time is 10-30 h.
Specifically, the preheating temperature of the roller for multi-pass hot rolling is 100-150 ℃, the rolling reduction of a single pass is 5-20%, and the annealing heat preservation time between passes is 5-10 min.
Specifically, the rolling temperature is 250-420 ℃, the total rolling reduction is 50-90%, and the thickness of the rolled plate is 1-15 cm.
In another aspect of the present invention, mg 2 The Si reinforced magnesium-based composite material plate comprises the following components in percentage by mass: 0 to 1 percent of Sr,0.3 to 1.2 percent of Zn,3 to 6.5 percent of Al,0.5 to 1.5 percent of Si, and the balance of Mg.
Compared with the prior art, the invention at least has the following beneficial effects:
invention relates to Mg 2 The preparation method of the Si reinforced magnesium-based composite material plate comprises the steps of putting industrial pure Mg into a crucible in a resistance furnace under the protection of argon and a covering agent, heating and melting, continuing to heat and add industrial pure Al, pure Zn, mg-xSi and Mg-xSr intermediate alloy to prepare a melt; then the temperature of the melt is reduced to enable the melt to be in a semi-solid state, and mechanical stirring is carried out; after slag is fished out, the mixture is stood for a period of time and cast into a mold which is preheated in advance, and a magnesium-based composite material cast ingot modified by adding Sr is prepared; finally, the magnesium alloy ingot is put into a preheated roller for rolling after being subjected to solution treatment to prepare the Mg with higher formability 2 A Si-reinforced magnesium-based composite sheet. Mg is regulated and controlled by changing the addition amount of Sr element and reaction time in the preparation process 2 The size of Si reduces microcracks generated by stress concentration of the plate during hot working, improves the formability of products and the yield during working production, and enhances the Mg content of phase particles 2 Si is synthesized in situ, the Si is well combined with a matrix interface, and simultaneously the Mg is improved by adopting hot rolling deformation 2 Of Si-reinforced Mg-based compositesMechanical properties, in particular plasticity.
Furthermore, the Si content and the Sr content in the magnesium-silicon and magnesium-strontium intermediate alloy are respectively 5-15%, and 20-40% aims to smoothly add Sr element and Si element at about 650 ℃, so that the experiment is not carried out under the condition of overhigh temperature, and the safety of the experiment is ensured.
Furthermore, the heating and melting temperature is 660-620 ℃ to rapidly melt pure magnesium into a molten state, and the melting point of magnesium is 650 ℃.
Furthermore, the temperature of the continuous heating is 650-600 ℃, so that the temperature in the furnace is not too high while the pure aluminum, the pure zinc, the magnesium-silicon and the magnesium-strontium master alloy are rapidly melted, the melting point of the pure aluminum is 660 ℃, and the melting point of the master alloy is 650 ℃.
Furthermore, the temperature of the cooling treatment is 560-650 ℃ to enable the melt to be in a semi-solid state, and the mechanical stirring speed is 150-250 r/min for 5-10 min to enable the reaction in the furnace to be fully carried out.
Furthermore, the standing time is 10-20 min to ensure that the slag floats on the surface, the obtained sample is purer, and the pouring temperature is 600-620 ℃ so as to ensure that the melt is filled in the thin section of the mould.
Furthermore, the temperature of the solution treatment is 360-420 ℃, and the time is 10-30 h, so that a uniform supersaturated solid solution is obtained, and the stress generated by processing is eliminated, so that the alloy is recrystallized.
Furthermore, the preheating temperature of the roller for multi-pass hot rolling is 100-150 ℃ to prevent cast ingot temperature loss and plate surface cracks and edge cracks, the reduction between single passes is set to be 5% -20% to prevent the plate from suddenly cracking due to overlarge single reduction, and the annealing heat preservation time between passes is 5-10 min to soften the material after hot processing, homogenize chemical components, remove residual stress and achieve the expected physical performance.
Furthermore, the rolling temperature of 250-420 ℃ is because the plasticity of the magnesium alloy is very low at room temperature, when the deformation temperature reaches above 225 ℃, the plasticity of the magnesium alloy is improved, and in the plastic processing process, the temperature of the magnesium alloy is reduced quickly and unevenly, and edge cracks and cracks are easy to occur, so the temperature range is narrow. The total reduction is 50% -90%, if the total reduction is too large, edge cracks can be generated, if the total reduction is too small, the structure and the performance of the plate can be affected, the thickness of the rolled plate is 3-6 cm, the requirements during processing production can be better met, and subsequent processing treatment is facilitated.
The invention relates to Mg 2 The Si reinforced Mg-base composite material plate adopts Sr element as activator to effectively refine Mg 2 The size of Si improves the formability of the product and the yield in processing production.
In conclusion, the method can regulate and control Mg by changing the addition amount and the reaction time of Sr element in the preparation process 2 The size of Si reduces microcracks generated by stress concentration of the plate during hot processing, improves the formability of products and the yield during processing production, and improves Mg by adopting hot rolling deformation 2 Si enhances the mechanical property, especially the plasticity of the magnesium-based composite material.
The technical solution of the present invention is further described in detail by the following examples.
Detailed Description
The technical solutions of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In the present invention, all the embodiments and preferred methods mentioned herein can be combined with each other to form a new technical solution, if not specifically stated.
In the present invention, all the technical features mentioned herein and preferred features may be combined with each other to form a new technical solution, if not specifically stated.
In the present invention, the percentage (%) or parts means the weight percentage or parts by weight with respect to the composition, if not otherwise specified.
In the present invention, the components referred to or the preferred components thereof may be combined with each other to form a novel embodiment, unless otherwise specified.
In the present invention, unless otherwise indicated, the numerical range "a-b" represents a shorthand representation of any combination of real numbers between a and b, where a and b are both real numbers. For example, a numerical range of "6 to 22" indicates that all real numbers between "6 to 22" have been listed herein, and "6 to 22" is only a shorthand representation of the combination of these numbers.
The "ranges" disclosed herein may have one or more lower limits and one or more upper limits, respectively, in the form of lower limits and upper limits.
As used herein, the term "and/or" refers to any and all possible combinations of one or more of the associated listed items and includes such combinations.
In the present invention, unless otherwise specified, each reaction or operation step may be performed sequentially or in an order. Preferably, the reaction processes herein are carried out sequentially.
Unless otherwise defined, technical and scientific terms used herein have the same meaning as is familiar to those skilled in the art. In addition, any methods or materials similar or equivalent to those described herein can also be used in the present invention.
The invention provides Mg 2 The preparation method of the Si reinforced magnesium-based composite material plate comprises the following steps:
s1, preparing industrial pure Mg, industrial pure Al, pure Zn, mg-xSi and Mg-xSr intermediate alloys, cleaning and drying the raw materials in advance;
the Si content and the Sr content in the Mg-xSi intermediate alloy and the Mg-xSr intermediate alloy are respectively 5 to 15 percent and 20 to 40 percent; the drying temperature is 65-100 ℃, and the raw materials are cleaned by alcohol and dried by a blower to ensure the drying of the raw materials and avoid generating excessive impurities.
S2, placing industrial pure Mg in a crucible in a resistance furnace under the protection of argon and a covering agent for heating and melting, and continuously heating and adding industrial pure Al, pure Zn, mg-xSi and Mg-xSr intermediate alloy to prepare a melt;
putting industrial pure magnesium into a crucible, heating and melting in a resistance furnace at 660-620 ℃, and adding industrial pure Al, pure Zn and intermediate alloy when the temperature of the resistance furnace is raised to 650-600 ℃.
S3, reducing the temperature of the melt prepared in the step S2 to enable the melt to be in a semi-solid state, and mechanically stirring; after slag is fished, standing for a period of time, and casting the slag into a mold which is preheated in advance to prepare a magnesium-based composite ingot modified by adding Sr;
the temperature of the melt presenting semi-solid state is 560-650 ℃; the mechanical stirring time is 5min, and the mechanical stirring speed is 200r/min; standing for 10-20 min, pouring temperature of 600-620 ℃ and mold preheating temperature of 200-400 ℃.
S4, carrying out solid solution treatment on the magnesium-based composite material ingot prepared in the step S3;
the temperature of the solution treatment is 360-420 ℃, the time is 10-30 h, and the thickness of the cast ingot is 10-30 cm.
And S5, carrying out multi-pass hot rolling on the magnesium-based composite ingot obtained in the step S4 after heat preservation to obtain the magnesium-based composite plate.
The roller preheating temperature is 100-150 ℃, multi-pass rolling is adopted, the single-pass reduction is 5% -20%, and annealing and heat preservation are carried out for 5-10 min between passes.
The rolling temperature is 250-420 ℃, the total rolling reduction is 50-90%, and the thickness of the rolled plate is 1-15 cm.
Mg prepared by the method of the invention 2 The Si reinforced magnesium-based composite material plate comprises the following components in percentage by mass: 0 to 1 percent of Sr,0.3 to 1.2 percent of Zn,3 to 6.5 percent of Al,0.5 to 1.5 percent of Si, and the balance of Mg, has high strength and good plasticity, meets the requirement of light weight of electronic products, has high formability, good yield, simple process and low cost, and can be used for manufacturing rear shells of mobile phones and rear covers of notebooks.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Preparation of 1.5wt.% Mg 2 Si +0.2wt.% Sr magnesium based composite:
the industrial pure Mg, pure Al, pure Zn, mg-5wt.% Si and Mg-20wt.% Sr intermediate alloy are cleaned by alcohol in advance and dried for 25min at 65 ℃ by a drying oven.
Heating and melting industrial pure Mg at 660 ℃ under the protection of argon and a covering agent to prepare a melt, adding industrial pure Al, pure Zn and Mg-5 percent Si and Mg-20 percent Sr intermediate alloy when the temperature of a resistance furnace rises to 650 ℃, cooling to 600 ℃ to enable the melt to be in a semi-solid state, then mechanically stirring for 5min at a rotation speed of 150r/min, standing for 10min, removing surface scum, casting into a mold at 200 ℃ when the temperature is 600 ℃, and preparing a magnesium alloy ingot with the thickness of 10cm and modified by adding Sr.
Putting the prepared magnesium alloy ingot into a resistance furnace at the temperature of 360 ℃ for solution treatment for 30 hours, then putting the magnesium alloy ingot into a roller preheated at the temperature of 100 ℃ for rolling, adopting multi-pass rolling, annealing and preserving heat for 10 minutes between passes, wherein the rolling temperature is 250 ℃, the single reduction is 5 percent, and the total reduction is 50 percent to obtain Mg with the thickness of 5cm and modified by adding Sr element 2 A Si/Mg based composite board.
Sr element modified Mg with thickness of 5cm prepared in this example 2 In the Si/Mg-based composite board, a small part of Mg 2 The shape of Si is improved, the plasticity is enhanced, the formability of the rolled plate is improved, and the yield is good.
Example 2
Preparation of 3wt.% Mg 2 Si+0.25wt.% Sr magnesium based composite:
the industrial pure Mg, pure Al, pure Zn, mg-10wt.% Si and Mg-25wt.% Sr intermediate alloy are cleaned by alcohol in advance and dried for 20min at 90 ℃ by a drying oven.
Heating and melting industrial pure Mg at 690 ℃ under the protection of argon and a covering agent to prepare a melt, adding industrial pure Al, pure Zn and intermediate alloy of Mg-10 percent Si and Mg-25 percent Sr when the temperature of the resistance furnace is increased to 660 ℃, cooling to 610 ℃ to enable the melt to be in a semi-solid state, then mechanically stirring for 6min at the rotating speed of 160r/min, removing surface scum after standing for 10min, casting into a mold at 250 ℃ when the temperature is 605 ℃, and preparing a magnesium alloy ingot with the thickness of 15cm and modified by adding Sr.
Putting the prepared magnesium alloy ingot into a resistance furnace with the temperature of 390 ℃ for solution treatment for 25 hours, then putting the magnesium alloy ingot into a roller preheated at 110 ℃ in advance for rolling, adopting multi-pass rolling, annealing and preserving heat for 9min between passes, wherein the rolling temperature is 300 ℃, the single reduction is 10%, the total reduction is 60%, and obtaining the Sr-added modified Mg with the thickness of 6cm 2 A Si/Mg based composite board.
Sr element modified Mg with thickness of 6cm prepared in this example 2 In the Si/Mg-based composite sheet, part of Mg 2 The shape of Si is improved, the plasticity is enhanced, the formability of the rolled plate is improved, and the yield is good.
Example 3
Preparation of 3wt.% Mg 2 Si +0.3wt.% Sr magnesium based composite:
the industrial pure Mg, pure Al, pure Zn, mg-10wt.% Si and Mg-30wt.% Sr intermediate alloy are cleaned in advance with alcohol and dried for 15min at 90 ℃ by a drying oven.
Heating and melting industrial pure Mg at 600 ℃ under the protection of argon and a covering agent to prepare a melt, adding industrial pure Al, pure Zn and Mg-10% Si and Mg-30% Sr intermediate alloy when the temperature of a resistance furnace rises to 665 ℃, cooling to 620 ℃ to enable the melt to be in a semi-solid state, then mechanically stirring for 6min at the rotation speed of 190r/min, standing for 15min, removing surface scum, casting into a mold at the temperature of 300 ℃ when the temperature is 610 ℃, and preparing a magnesium alloy ingot with the thickness of 20cm and modified by adding Sr.
Putting the prepared magnesium alloy ingot into a resistance furnace with the temperature of 400 ℃ for solution treatment for 20 hours, then putting the magnesium alloy ingot into a roller preheated at 120 ℃ in advance for rolling, adopting multi-pass rolling, annealing and preserving heat for 6min between passes, wherein the rolling temperature is 350 ℃, the single reduction is 15%, the total reduction is 60%, and obtaining the Sr element modified Mg with the thickness of 6cm 2 A Si/Mg based composite board.
Sr element modified Mg with thickness of 6cm prepared in this example 2 In the Si/Mg-based composite sheet, part of Mg 2 The shape of Si is improved, the plasticity is enhanced, the formability of the rolled plate is improved, and the yield is good.
Example 4
Preparation of 3wt.% Mg 2 Si +0.35wt.% Sr magnesium based composite:
the industrial pure Mg, pure Al, pure Zn, mg-10wt.% Si and Mg-35wt.% Sr intermediate alloy are cleaned by alcohol in advance and dried for 20min at 95 ℃ by a drying oven.
Heating and melting industrial pure Mg at 610 ℃ under the protection of argon and a covering agent to prepare a melt, adding industrial pure Al, pure Zn and Mg-10 percent Si and Mg-35 percent Sr intermediate alloy when the temperature of a resistance furnace is raised to 660 ℃, cooling to 630 ℃ to enable the melt to be in a semi-solid state, then mechanically stirring for 6min at a rotating speed of 210r/min, standing for 10min, removing surface scum, casting into a mold at 350 ℃ when the temperature is 615 ℃, and preparing a magnesium alloy ingot with the thickness of 25cm and modified by adding Sr.
Putting the prepared magnesium alloy ingot into a resistance furnace with the temperature of 410 ℃ for solution treatment for 15h, then putting the ingot into a roller preheated at the temperature of 130 ℃ for rolling, adopting multi-pass rolling, annealing and preserving heat for 6min between passes, wherein the rolling temperature is 400 ℃, the single reduction is 10 percent, the total reduction is 60 percent, and obtaining Mg with the thickness of 5cm and modified by adding Sr element 2 A Si/Mg based composite board.
Sr element modified Mg with thickness of 5cm prepared in this example 2 In the Si/Mg-based composite sheet, most of Mg 2 The shape of Si is improved, the plasticity is enhanced, and the rolled plateThe formability of the material is improved, and the yield is good.
Example 5
Preparation of 3wt.% Mg 2 Si +0.4wt.% Sr magnesium based composite:
the industrial pure Mg, pure Al, pure Zn, mg-10wt.% Si and Mg-40wt.% Sr intermediate alloy are cleaned by alcohol in advance and dried for 15min at 95 ℃ by a drying oven.
Heating and melting industrial pure Mg at 615 ℃ under the protection of argon and a covering agent to prepare a melt, adding industrial pure Al, pure Zn and Mg-10 percent Si and Mg-40 percent Sr intermediate alloy when the temperature of the resistance furnace rises to 665 ℃, cooling to 640 ℃ to enable the melt to be in a semi-solid state, then mechanically stirring for 9min at a rotating speed of 230r/min, removing surface scum after standing for 10min, casting into a mold at 360 ℃ when the temperature is 615 ℃, and preparing a Sr-modified magnesium alloy ingot with the thickness of 26 cm.
Putting the prepared magnesium alloy ingot into a resistance furnace with the temperature of 415 ℃ for solution treatment for 13 hours, then putting the magnesium alloy ingot into a roller preheated at 140 ℃ in advance for rolling, adopting multi-pass rolling, annealing and preserving heat for 6 minutes between passes, wherein the rolling temperature is 410 ℃, the single reduction is 15 percent, the total reduction is 65 percent, and obtaining the Sr element modified Mg with the thickness of 4.2cm 2 A Si/Mg based composite board.
Sr element modified Mg with a thickness of 4.2cm prepared in this example 2 In the Si/Mg-based composite sheet, almost all Mg 2 The shape of Si is improved, the plasticity is enhanced, the formability of the rolled plate is improved, and the yield is good.
Example 6
Preparation of 4.5wt.% Mg 2 Si +0.4wt.% Sr magnesium based composite:
the industrial pure Mg, pure Al, pure Zn, mg-15wt.% Si and Mg-40wt.% Sr intermediate alloy are cleaned by alcohol in advance and dried for 10min at 100 ℃ by a drying oven.
Heating and melting industrial pure Mg at 620 ℃ under the protection of argon and a covering agent to prepare a melt, adding industrial pure Al, pure Zn and Mg-15 percent Si and Mg-40 percent Sr intermediate alloy when the temperature of a resistance furnace is increased to 660 ℃, cooling to 650 ℃ to enable the melt to be in a semi-solid state, then mechanically stirring for 10min at a rotating speed of 250r/min, removing surface scum after standing for 10min, casting into a mold at 400 ℃ when the temperature is 620 ℃, and preparing a magnesium alloy ingot with the thickness of 30cm and modified by adding Sr.
Putting the prepared magnesium alloy ingot into a resistance furnace with the temperature of 420 ℃ for solution treatment for 10 hours, then putting the magnesium alloy ingot into a roller preheated at 150 ℃ in advance for rolling, adopting multi-pass rolling, annealing and preserving heat for 5min between passes, wherein the rolling temperature is 420 ℃, the single reduction is 20%, the total reduction is 90%, and obtaining the Sr-added modified Mg with the thickness of 3cm 2 A Si/Mg based composite board.
Sr element modified Mg with thickness of 3cm prepared in this example 2 In the Si/Mg-based composite sheet, almost all Mg 2 The shape of Si is improved, the plasticity is enhanced, the formability of the rolled plate is improved, and the yield is good.
In summary, the present invention provides Mg 2 Firstly, cleaning and drying industrial pure Mg, pure Al, pure Zn, mg-xSi and Mg-xSr intermediate alloys by alcohol in advance, placing a crucible into a resistance furnace, heating and melting the industrial pure Mg under the protection of argon and a covering agent, continuously heating and adding the industrial pure Al, the pure Zn, the Mg-xSi and the Mg-xSr intermediate alloys to prepare a melt; reducing the temperature of the prepared melt to enable the melt to be in a semi-solid state, and mechanically stirring; after slag is fished out, the mixture is stood for a period of time and cast into a mold which is preheated in advance, and a magnesium-based composite material cast ingot modified by adding Sr is prepared; then putting the cast ingot into a resistance furnace for solution treatment and heat preservation, and then carrying out multi-pass hot rolling to obtain Mg 2 A Si-reinforced magnesium-based composite sheet. Mg modified by addition of Sr 2 Reinforcing phase Mg in Si/Mg-based composite material 2 The Si size is reduced, the stress concentration in the hot working process is reduced, and the composite material is prevented from cracking; and the mechanical property of the composite material is also improved by hot rolling deformation. The composite material prepared by the invention has the advantages of higher formability, yield and good plasticity, in addition, the process is simple, the cost is low, and the composite material can be well used for mobile phone backshells and notebook computer backshells.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (3)
1. Mg 2 The preparation method of the Si-reinforced magnesium-based composite material plate is characterized in that industrial pure Mg is heated and melted under the protection of argon and a covering agent, the temperature is continuously increased to 750-800 ℃, then the industrial pure Al, the pure Zn and intermediate alloys of Mg-xSi and Mg-xSr are sequentially added to prepare a melt, the Si content in the Mg-xSi and the Mg-xSr is 5-15%, and the Sr content is 20-40%; cooling the melt, wherein the temperature of the cooling treatment is 580-650 ℃, the melt is in a semi-solid state, mechanically stirring for 5-10min at the mechanical stirring speed of 150-250r/min, taking out slag, standing for 10-20min, and casting at 700-720 ℃ to obtain a Sr modified magnesium-based composite material ingot; carrying out solid solution treatment on the magnesium-based composite material ingot at 380-420 ℃ for 10-30h to obtain an ingot with the thickness of 10-30cm; carrying out heat preservation treatment on the cast ingot, and then carrying out multi-pass hot rolling to obtain a magnesium-based composite material plate, wherein the preheating temperature of a roller for the multi-pass hot rolling is 100-150 ℃, the rolling reduction of a single pass is 5-20%, the annealing heat preservation time between passes is 5-10min, the rolling temperature is 250-420 ℃, and the total rolling reduction is 50-90%; the prepared magnesium-based composite material plate comprises the following components in percentage by mass: 0.2-1% of Sr, 0.3-1.2% of Zn, 3-6.5% of Al, 0.5-1.5% of Si and the balance of Mg.
2. Mg of claim 1 2 The preparation method of the Si-reinforced magnesium-based composite material plate is characterized in that the heating and melting temperature is 680 to 720 ℃.
3. Mg of claim 1 2 Si reinforced magnesium-base composite material plateMg prepared by preparation method 2 A Si-reinforced Mg-based composite plate.
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|---|---|---|---|---|
| JP3254848B2 (en) * | 1993-10-07 | 2002-02-12 | 宇部興産株式会社 | Magnesium alloy for pressure casting with low crack sensitivity |
| US5551996A (en) * | 1993-03-30 | 1996-09-03 | Ube Industries, Ltd. | Si-containing magnesium alloy for casting with melt thereof |
| JP2004277761A (en) * | 2003-03-12 | 2004-10-07 | Aisin Seiki Co Ltd | Creep resistant die-casting magnesium alloy with high strength |
| CN101871067B (en) * | 2009-04-24 | 2012-05-23 | 中国科学院金属研究所 | Strontium modified silicon-containing high-strength magnesium alloy and preparation method thereof |
| CN101818293B (en) * | 2010-04-21 | 2012-05-30 | 广州有色金属研究院 | Heat resistant magnesium alloy |
| CN102051509A (en) * | 2010-12-28 | 2011-05-11 | 西安工业大学 | High-toughness heat-resistant Mg-Al-RE-Mn wrought magnesium alloy and preparation method of plate made of same |
| CN104046870A (en) * | 2014-07-09 | 2014-09-17 | 北京汽车股份有限公司 | High-elasticity-modulus magnesium alloy and preparation method thereof |
| CN104313426B (en) * | 2014-10-16 | 2017-01-11 | 辽宁石油化工大学 | Alkaline-earth element modified heat-resistant magnesium alloy and preparation method thereof |
| CN104694805B (en) * | 2015-02-27 | 2017-05-24 | 河南科技大学 | Low-cost multi-component heat-resistant magnesium alloy and preparation method of magnesium alloy |
| CN107541627B (en) * | 2016-06-24 | 2019-09-06 | 北京科技大学 | A kind of wrought magnesium alloy plate and preparation method thereof with good room temperature formability |
| CN109295366B (en) * | 2018-12-03 | 2020-03-27 | 北京工业大学 | Room-temperature high-forming magnesium alloy plate and preparation method thereof |
| CN111922313A (en) * | 2020-06-22 | 2020-11-13 | 深圳市吉胜华力科技有限公司 | Novel magnesium alloy semi-solid forming process |
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2022
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