CN109161752B - Heat-resistant creep-resistant magnesium alloy and preparation method thereof - Google Patents
Heat-resistant creep-resistant magnesium alloy and preparation method thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
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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
- 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 relates to the technical field of metallurgy, in particular to a low-cost heat-resistant creep-resistant magnesium alloy and a preparation method thereof. The magnesium alloy comprises the following components of 3-6 wt%, 2-5 wt%, 0.4-2 wt%, 0.1-1 wt% and 0.1-1 wt%, wherein the alloy elements comprise tin, strontium, calcium, scandium and manganese, and the balance of magnesium, and the total content of the alloy elements is less than or equal to 10%. The preparation method comprises the steps of preheating and melting pure magnesium, respectively adding Mg-Sn, Mg-Sr, Mg-Ca, Mg-Mn and Mg-Sc intermediate alloys, refining after the added metals are melted, finally preparing a blank from the refined alloy solution by adopting a casting method, and finally rolling or forging or extruding or compositely deforming the pretreated continuous casting blank to prepare the low-cost heat-resistant creep-resistant magnesium alloy. The magnesium alloy can be used for a long time under the use condition of 300 ℃ at 250-.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a heat-resistant creep-resistant magnesium alloy and a preparation method thereof.
Background
The magnesium alloy is an alloy formed by adding other elements on the basis of magnesium. The method is characterized in that: the density is small (1.8 g/cm)3Left and right), high specific strength, large elastic modulus, easy recovery, good shock absorption and the content of magnesium alloy on the earth is extremely rich. Under the dual pressure of the world petrochemical energy crisis and environmental pollution, in order to achieve the effects of energy conservation and emission reduction, weight reduction is provided for the fields of automobiles, aviation and the like in all countries in the worldThe density of magnesium alloy is required to be only two thirds of that of aluminum alloy and one fourth of that of steel, so that the magnesium alloy has important application potential in the fields.
Despite the foregoing, poor high temperature creep performance of magnesium alloys is a major challenge for the wide application of magnesium alloys in the automotive and aerospace industries, where many critical components (automotive engine pistons) are used at temperatures in excess of 175 ℃. At present, rare earth (Gd, Y, Ce and the like) is added into the magnesium alloy to improve the creep resistance of the magnesium alloy at high temperature, but the cost of the magnesium alloy is greatly improved, so that the application of the rare earth magnesium alloy in the fields of automobiles, aviation industry and the like is limited. Another common creep-resistant magnesium alloy is obtained by adding common alloying elements such as Zn, Ca, Si, Sr, etc. to a Mg — Al system magnesium alloy. The magnesium alloy of the system has the advantages of lower cost, but the magnesium alloy of the system resists the high-temperature second phase Mg17Al12When the temperature is higher than 175 ℃, the magnesium alloy is decomposed, so that the creep resistance of the magnesium alloy system is rapidly reduced when the temperature is higher than 175 ℃, the creep resistance requirement at high temperature cannot be met, and the performance defect greatly limits the application of the Mg-Al series magnesium alloy in the fields of aviation, automobiles and the like.
Therefore, the development of the heat-resistant and creep-resistant magnesium alloy with low cost has great application potential in the fields of automobiles, aviation industry and the like.
Disclosure of Invention
Aiming at the defects, the invention provides the heat-resistant creep-resistant magnesium alloy and the preparation method thereof, the prepared magnesium alloy has high heat resistance, can be used for a long time at the temperature of 250-350 ℃, is suitable for the fields of aerospace, war industry, automobiles and the like, can replace the existing materials such as aluminum alloy, steel and the like, and realizes the weight reduction aim.
The technical scheme of the invention is as follows:
in one aspect, the invention provides a low-cost heat-resistant creep-resistant magnesium alloy, which is characterized in that the alloy elements comprise 3-6 wt%, 2-5 wt%, 0.4-2 wt%, 0.1-1 wt% and 0.1-1 wt% of tin, strontium, calcium, scandium and manganese, and the balance of magnesium, and the total content of the alloy elements is less than or equal to 10%.
The weight percentages of the scandium, the tin, the strontium, the calcium and the manganese are respectively 0.5%, 4%, 3%, 0.5% and 0.5%, and the balance is magnesium.
The working temperature of the magnesium alloy is 250-350 ℃.
The invention provides a preparation method of a low-cost heat-resistant creep-resistant magnesium alloy, which comprises the following steps:
the method comprises the following steps: heating and melting pure magnesium, adding a magnesium-scandium alloy, a magnesium-tin alloy, a magnesium-strontium alloy, a magnesium-manganese alloy and a magnesium-calcium alloy into the pure magnesium melt, and preparing the added alloys into an alloy melt;
step two: after refining treatment is carried out on the alloy melt, the alloy melt is cooled to the casting temperature, and a low-cost creep-resistant magnesium alloy blank is prepared by casting;
step three: the magnesium alloy blank is pretreated and preheated, and the low-cost creep-resistant magnesium alloy part is manufactured by adopting a deformation method.
The heating and melting process of the first step is specifically as follows: heating the pure magnesium to 160-250 ℃, preserving the heat for 5-15 minutes, and then melting the pure magnesium under the protection of protective gas or flame-retardant covering.
The adding process of the step one is specifically as follows: heating the pure magnesium melt to 650-800 ℃, heating the magnesium-scandium alloy, the magnesium-tin alloy, the magnesium-strontium alloy, the magnesium-manganese alloy and the magnesium-calcium alloy to 160-250 ℃, preserving the heat for 5-15 minutes, and respectively adding the pure magnesium melt into the pure magnesium melt.
The refining treatment process of the second step is specifically as follows: stirring the alloy melt for 3-30 minutes, then heating to 750-800 ℃, and standing for 20-100 minutes; the casting process parameters are as follows: the temperature range is 620 ℃ and 800 ℃.
The pretreatment process of the third step is specifically as follows: the magnesium alloy blank is subjected to homogenization treatment at the temperature of 350-450 ℃, and the homogenization time is 120-600 minutes.
The pretreatment process of the third step is specifically as follows: the magnesium alloy blank is subjected to solution treatment at the temperature of 420-500 ℃, and the solution treatment time is 180-400 minutes.
The deformation method in the third step is drawing, rolling, extruding, forging or a composite deformation mode of the deformation method; the magnesium alloy part is a plate, a pipe, a section bar, a wire or a forging.
In a further aspect, the invention provides a heat-resistant creep-resistant magnesium alloy, which is characterized in that the heat-resistant creep-resistant magnesium alloy is prepared by the method, wherein the alloy comprises the following components of tin, strontium, calcium, scandium and manganese, the balance of magnesium, the weight percentages of the tin, strontium, calcium, scandium and manganese are respectively 3-6%, 2-5%, 0.4-2%, 0.1-1% and 0.1-1%, and the total content of the alloy elements is less than or equal to 10%.
The invention achieves remarkable technical effects.
The invention prepares the low-cost heat-resistant creep-resistant magnesium alloy under proper process conditions by adding alloy elements such as scandium, tin, strontium, calcium, manganese and the like into the linear magnesium, and the magnesium alloy has superior high-temperature creep property compared with the traditional AZ series commercial creep-resistant magnesium alloy. The creep resistance is equivalent to WE54, can be used for a long time under the use condition of 350 ℃ at 250 ℃, and can meet the weight reduction requirements of industries such as aerospace, military industry and automobiles. Meanwhile, the added alloy elements are conventional alloy elements, so that the cost is reduced by 30-60% compared with the conventional alloy elements, and the method is suitable for industrial application.
Detailed Description
The conception, the specific structure and the technical effects of the present invention will be further described below to fully understand the objects, the features and the effects of the present invention.
The heat-resistant high-strength wrought magnesium alloy comprises the following alloy elements of 3-6 wt%, 2-5 wt%, 0.4-2 wt%, 0.1-1 wt% and 0.1-1 wt% of Sn, Sr, Ca, Sc and Mn, and the balance of Mg, wherein the total content of the alloy elements is less than or equal to 10%.
The Sc element is added into the magnesium alloy, so that a second phase (Mg) with high melting point can be formed2Sc) for improving the creep property of the alloy at high temperature and simultaneously melting the alloyThe grain size of the alloy can be effectively refined in the smelting process, and the tensile property of the alloy is improved. Mn is added into an alloy system, so that on one hand, the heterogeneous nucleation number of a melt can be effectively increased, and simultaneously, the Mn can form high-melting-point Mn with Mn elements2Sc is distributed in the grain boundary, so that the high-temperature creep resistance of the alloy is improved by inhibiting the high-temperature small grain boundary slippage of the alloy. In addition, the corrosion resistance of the alloy can be effectively improved by adding Mn. The Sn element is added into the magnesium alloy to form finely dispersed Mg with high thermal stability2Sn can effectively improve the high-temperature creep resistance of the prepared magnesium alloy, and can also effectively increase a heterogeneous nucleation grain refiner in the solidification process of the alloy, so that the effect of refining grains is achieved, and grain boundary and dislocation slippage can be effectively prevented in the high-temperature deformation process, so that the high-temperature creep resistance is improved; the Sr element is added into the magnesium alloy to form Mg with high melting point2Sr is uniformly distributed in crystal boundaries and crystal interior, so that dislocation slippage and crystal boundary sliding in the crystal interior at high temperature are inhibited, and the high-temperature creep resistance of the alloy is improved; the addition of Ca element can improve the flame retardant property of the alloy and form high melting point Mg2Ca second phase, thereby further improving the high-temperature creep resistance of the magnesium alloy.
The preparation method of the heat-resistant high-strength wrought magnesium alloy comprises the following steps of:
(1) heating pure magnesium to 160-250 ℃, preserving heat for 5-15 minutes, and then melting the pure magnesium under the protection of protective gas or flame-retardant covering;
(2) heating the pure magnesium melt to 650-800 ℃, heating the magnesium scandium alloy, the magnesium tin alloy, the magnesium strontium alloy, the magnesium manganese alloy and the magnesium calcium alloy to 160-250 ℃, preserving the heat for 5-15 minutes, and respectively adding the magnesium alloy and the magnesium into the pure magnesium melt to melt the added alloy and magnesium to prepare an alloy melt;
(3) skimming dross on the surface of the melt, stirring for 3-30 minutes, then heating to 750-800 ℃, and standing for 20-100 minutes;
(4) cooling to the casting temperature for casting to prepare the Mg-Sn-Sr-Ca-Sc-Mn alloy spindle, wherein the casting process parameters are as follows: the temperature range is 650-800 ℃;
(5) the magnesium alloy spindle is pretreated, and the pretreatment process is carried out according to one of the following two modes: (a) homogenizing the magnesium alloy spindle at the temperature of 350-; (b) carrying out solution treatment on the magnesium alloy ingot at the temperature of 420-500 ℃, wherein the solution treatment time is 180-400 minutes;
(6) the heat-resistant high-strength deformation magnesium alloy part, such as a plate, a pipe, a section bar, a wire or various forgings, is prepared by adopting deformation modes such as drawing, rolling, extruding, forging and pressing or a composite deformation mode of the deformation modes.
The Mg-Sn-Sr-Ca-Sc-Mn magnesium alloy prepared by the method can be used for a long time under the use condition of the temperature range of 250-350 ℃, and the creep resistance of the magnesium alloy in the temperature range is greatly improved, so that the Mg-Sn-Sr-Ca-Sc-Mn magnesium alloy can be widely applied to manufacturing of parts in the fields of aerospace, military industry, automobiles and the like.
The following 6 examples illustrate the effect of different element component contents and preparation methods on the mechanical properties of the prepared magnesium alloy.
Example 1
(1) Heating pure magnesium to 160 deg.C, holding the temperature for 15 min, and then adding into SF6+CO2Melting pure magnesium under the protection of protective gas;
(2) heating the pure magnesium melt to 650 ℃, heating a magnesium-tin alloy (the final weight percentage content of tin element is 3%), a magnesium-strontium alloy (the final weight percentage content of strontium element is 2%), a magnesium-calcium alloy (the final weight percentage content of calcium element is 1%), a magnesium-scandium alloy (the final weight percentage content of scandium element is 1%) and a magnesium-manganese alloy (the final weight percentage content of manganese element is 1%) to 160 ℃, preserving heat for 15 minutes, and respectively adding the magnesium-tin alloy and the magnesium-scandium alloy into the pure magnesium melt to melt the added alloy and magnesium to prepare an alloy melt;
(3) skimming dross on the surface of the melt, stirring for 15 minutes, then heating to 750 ℃, and standing for 60 minutes;
(4) cooling to the casting temperature for casting to prepare the Mg-Sn-Sr-Ca-Sc-Mn alloy spindle, wherein the casting process parameters are as follows: the temperature range is 750 ℃;
(5) pretreating the magnesium alloy spindle, wherein the pretreatment process is carried out according to the following steps: homogenizing the magnesium alloy spindle at 400 ℃ for 600 minutes;
(6) the heat-resistant high-strength deformation magnesium alloy part, such as a plate, a pipe, a section bar, a wire or various forgings, is prepared by adopting deformation modes such as drawing, rolling, extruding, forging and pressing or a composite deformation mode of the deformation modes.
Example 2
(1) Heating pure magnesium to 180 deg.C, maintaining the temperature for 13 min, and then adding into SF6+CO2Melting pure magnesium under the protection of protective gas;
(2) heating the pure magnesium melt to 670 ℃, heating a magnesium-tin alloy (the final weight percentage content of tin element is 4%), a magnesium-strontium alloy (the final weight percentage content of strontium element is 3%), a magnesium-calcium alloy (the final weight percentage content of calcium element is 1%), a magnesium-scandium alloy (the final weight percentage content of scandium element is 0.5%) and a magnesium-manganese alloy (the final weight percentage content of manganese element is 0.5%) to 180 ℃, preserving heat for 13 minutes, and respectively adding the magnesium-tin alloy and the magnesium-scandium alloy into the pure magnesium melt to melt the added alloy and magnesium to prepare an alloy melt;
(3) skimming dross on the surface of the melt, stirring for 10 minutes, then heating to 800 ℃, and standing for 35 minutes;
(4) cooling to the casting temperature for casting to prepare the Mg-Sn-Sr-Ca-Sc-Mn alloy spindle, wherein the casting process parameters are as follows: the temperature range is 770 ℃;
(5) pretreating the magnesium alloy spindle, wherein the pretreatment process is carried out according to the following steps: carrying out solid solution treatment on the magnesium alloy spindle at 480 ℃, wherein the solid solution treatment time is 180 minutes;
(6) the heat-resistant high-strength deformation magnesium alloy part, such as a plate, a pipe, a section bar, a wire or various forgings, is prepared by adopting deformation modes such as drawing, rolling, extruding, forging and pressing or a composite deformation mode of the deformation modes.
Example 3
(1) Heating pure magnesium to 200 deg.C, maintaining the temperature for 11 min, and then adding into SF6+CO2Melting pure magnesium under the protection of protective gas;
(2) heating the pure magnesium melt to 700 ℃, heating a magnesium-tin alloy (the final weight percentage content of tin element is 5%), a magnesium-strontium alloy (the final weight percentage content of strontium element is 4%), a magnesium-calcium alloy (the final weight percentage content of calcium element is 0.4%), a magnesium-scandium alloy (the final weight percentage content of scandium element is 0.1%) and a magnesium-manganese alloy (the final weight percentage content of manganese element is 0.1%) to 200 ℃, preserving heat for 11 minutes, and respectively adding the magnesium-magnesium alloy and the magnesium-magnesium alloy into the pure magnesium melt to melt the added magnesium alloy and magnesium to prepare an alloy melt;
(3) skimming dross on the surface of the melt, stirring for 3 minutes, then heating to 760 ℃ and standing for 20 minutes;
(4) cooling to the casting temperature for casting to prepare the Mg-Sn-Sr-Ca-Sc-Mn alloy spindle, wherein the casting process parameters are as follows: the temperature range is 790 ℃;
(5) pretreating the magnesium alloy spindle, wherein the pretreatment process is carried out according to the following steps: homogenizing the magnesium alloy spindle at 350 ℃ for 400 minutes;
(6) the heat-resistant high-strength deformation magnesium alloy part, such as a plate, a pipe, a section bar, a wire or various forgings, is prepared by adopting deformation modes such as drawing, rolling, extruding, forging and pressing or a composite deformation mode of the deformation modes.
Example 4
(1) Heating pure magnesium to 220 deg.C, holding for 9 min, and then adding into SF6+CO2Melting pure magnesium under the protection of protective gas;
(2) heating the pure magnesium melt to 750 ℃, heating a magnesium-tin alloy (the final weight percentage content of tin element is 6%), a magnesium-strontium alloy (the final weight percentage content of strontium element is 3%), a magnesium-calcium alloy (the final weight percentage content of calcium element is 0.4%), a magnesium-scandium alloy (the final weight percentage content of scandium element is 0.1%) and a magnesium-manganese alloy (the final weight percentage content of manganese element is 0.1%) to 220 ℃, preserving heat for 9 minutes, and respectively adding the magnesium-magnesium alloy and the magnesium-magnesium alloy into the pure magnesium melt to melt the added alloy and magnesium to prepare an alloy melt;
(3) skimming dross on the surface of the melt, stirring for 30 minutes, then heating to 790 ℃, and standing for 100 minutes;
(4) cooling to the casting temperature for casting to prepare the Mg-Sn-Sr-Ca-Sc-Mn alloy spindle, wherein the casting process parameters are as follows: the temperature range is 760 ℃;
(5) pretreating the magnesium alloy spindle, wherein the pretreatment process is carried out according to the following steps: carrying out solution treatment on the magnesium alloy ingot at 440 ℃, wherein the solution treatment time is 300 minutes;
(6) the heat-resistant high-strength deformation magnesium alloy part, such as a plate, a pipe, a section bar, a wire or various forgings, is prepared by adopting deformation modes such as drawing, rolling, extruding, forging and pressing or a composite deformation mode of the deformation modes.
Example 5
(1) Heating pure magnesium to 240 deg.C, holding for 7 min, and then adding into SF6+CO2Melting pure magnesium under the protection of protective gas;
(2) heating the pure magnesium melt to 770 ℃, heating a magnesium-tin alloy (the final weight percentage content of tin element is 3%), a magnesium-strontium alloy (the final weight percentage content of strontium element is 5%), a magnesium-calcium alloy (the final weight percentage content of calcium element is 0.4%), a magnesium-scandium alloy (the final weight percentage content of scandium element is 0.75%) and a magnesium-manganese alloy (the final weight percentage content of manganese element is 0.75%) to 240 ℃, preserving heat for 7 minutes, and respectively adding the magnesium-magnesium alloy and the magnesium-magnesium alloy into the pure magnesium melt to melt the added magnesium alloy and magnesium to prepare an alloy melt;
(3) skimming dross on the surface of the melt, stirring for 25 minutes, then heating to 770 ℃, and standing for 70 minutes;
(4) cooling to the casting temperature for casting to prepare the Mg-Sn-Sr-Ca-Sc-Mn alloy spindle, wherein the casting process parameters are as follows: the temperature range is 800 ℃;
(5) pretreating the magnesium alloy spindle, wherein the pretreatment process is carried out according to the following steps: homogenizing the magnesium alloy spindle at 425 ℃ for 200 minutes;
(6) the heat-resistant high-strength deformation magnesium alloy part, such as a plate, a pipe, a section bar, a wire or various forgings, is prepared by adopting deformation modes such as drawing, rolling, extruding, forging and pressing or a composite deformation mode of the deformation modes.
Example 6
(1) Heating pure magnesium to 250 deg.C, holding the temperature for 5 min, and then adding into SF6+CO2Melting pure magnesium under the protection of protective gas;
(2) heating the pure magnesium melt to 800 ℃, heating a magnesium-tin alloy (the final weight percentage content of tin element is 3%), a magnesium-strontium alloy (the final weight percentage content of strontium element is 3%), a magnesium-calcium alloy (the final weight percentage content of calcium element is 2%), a magnesium-scandium alloy (the final weight percentage content of scandium element is 0.5%) and a magnesium-manganese alloy (the final weight percentage content of manganese element is 0.5%) to 250 ℃, preserving heat for 5 minutes, and respectively adding the magnesium-tin alloy and the magnesium-scandium alloy into the pure magnesium melt to melt the added alloy and magnesium to prepare an alloy melt;
(3) skimming dross on the surface of the melt, stirring for 20 minutes, then heating to 775 ℃, and standing for 50 minutes;
(4) cooling to the casting temperature for casting to prepare the Mg-Sn-Sr-Ca-Sc-Mn alloy spindle, wherein the casting process parameters are as follows: the temperature range is 750 ℃;
(5) pretreating the magnesium alloy spindle, wherein the pretreatment process is carried out according to the following steps: carrying out solution treatment on the magnesium alloy spindle at 420 ℃, wherein the solution treatment time is 350 minutes;
(6) the heat-resistant high-strength deformation magnesium alloy part, such as a plate, a pipe, a section bar, a wire or various forgings, is prepared by adopting deformation modes such as drawing, rolling, extruding, forging and pressing or a composite deformation mode of the deformation modes.
In order to test the mechanical properties of the magnesium alloy prepared according to the present invention, the magnesium alloy prepared in 6 examples was placed at 250 ℃ (creep load 100MPa) and 350 ℃ (creep load 30MPa), and the mechanical properties were tested as follows:
as shown in the table, compared with most magnesium alloys which can only be used below 200 ℃, the alloy of the invention has excellent performance at the high temperature of 250-350 ℃, and the alloy elements used by the invention are low in price, thereby leading to low production cost.
The above disclosure is only an example of the present invention, but the present invention is not limited thereto, and any variations that can be made by those skilled in the art should fall within the scope of the present invention.
Claims (6)
1. The heat-resistant creep-resistant magnesium alloy is characterized in that alloy elements of the heat-resistant creep-resistant magnesium alloy are tin, strontium, calcium, scandium and manganese, and the balance of magnesium;
the weight percentages of the tin, strontium, calcium, scandium and manganese elements are respectively 4%, 3%, 1%, 0.5% and 0.5%, and the balance is magnesium;
the preparation method of the heat-resistant creep-resistant magnesium alloy comprises the following steps:
the method comprises the following steps: heating and melting pure magnesium, adding Mg-Sn, Mg-Sr, Mg-Mn, Mg-Ca and Mg-Sc intermediate alloy into the pure magnesium melt, and melting the added alloy and magnesium to prepare alloy melt;
step two: after refining treatment is carried out on the alloy melt, cooling to the casting temperature for casting, and preparing a magnesium alloy blank;
step three: pretreating and preheating a magnesium alloy blank, and manufacturing a heat-resistant creep-resistant magnesium alloy part by adopting a deformation method;
the pretreatment process of the third step is specifically as follows: the magnesium alloy blank is subjected to homogenization treatment at the temperature of 350-450 ℃, the homogenization time is 120-600 minutes, or the magnesium alloy blank is subjected to solution treatment at the temperature of 420-500 ℃, and the solution treatment time is 180-400 minutes.
2. The heat and creep resistant magnesium alloy as claimed in claim 1, wherein the working temperature of the magnesium alloy is 250-350 ℃.
3. The heat-resistant creep-resistant magnesium alloy according to claim 1, wherein the elevated-temperature melting process of the first step is specifically: heating the pure magnesium to 160-250 ℃, preserving the heat for 5-15 minutes, and then melting the pure magnesium under the protection of protective gas or flame-retardant covering.
4. The heat-resistant creep-resistant magnesium alloy according to claim 1, wherein the addition process of the first step is specifically as follows: heating the pure magnesium melt to 650-800 ℃, heating the intermediate alloys of Mg-Sn, Mg-Sr, Mg-Mn, Mg-Ca and Mg-Sc to 160-250 ℃, preserving the heat for 5-15 minutes, and respectively adding the intermediate alloys into the pure magnesium melt.
5. The heat-resistant creep-resistant magnesium alloy according to claim 1, wherein the refining process of the second step is specifically: stirring the alloy melt for 3-30 minutes, then heating to 750-800 ℃, and standing for 20-100 minutes; the casting process parameters are as follows: the temperature range is 650-800 ℃.
6. The heat-resistant creep-resistant magnesium alloy as claimed in claim 1, wherein the preheating temperature in the third step is 300-450 ℃ and the time is 30-120 minutes; the deformation method is drawing, rolling, extruding, forging or the composite deformation mode of the deformation method; the magnesium alloy part is a plate, a pipe, a section bar, a wire or a forging.
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| CN114086046B (en) * | 2021-11-23 | 2022-08-02 | 承德石油高等专科学校 | Mg-Sn-Sr-Zr-Sc alloy with room-temperature and high-temperature high-strength deformation and preparation process thereof |
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