EP2886670A1 - Alloy for magnesium and magnesium alloy grain refinement, and preparation method thereof - Google Patents
Alloy for magnesium and magnesium alloy grain refinement, and preparation method thereof Download PDFInfo
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- EP2886670A1 EP2886670A1 EP12882990.0A EP12882990A EP2886670A1 EP 2886670 A1 EP2886670 A1 EP 2886670A1 EP 12882990 A EP12882990 A EP 12882990A EP 2886670 A1 EP2886670 A1 EP 2886670A1
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- zirconium
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 49
- 239000000956 alloy Substances 0.000 title claims abstract description 49
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 40
- 239000011777 magnesium Substances 0.000 title claims abstract description 33
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- -1 aluminum-zirconium-boron Chemical compound 0.000 claims abstract description 33
- 239000000203 mixture Substances 0.000 claims abstract description 24
- 239000000126 substance Substances 0.000 claims abstract description 15
- 229910000521 B alloy Inorganic materials 0.000 claims description 17
- 229910052782 aluminium Inorganic materials 0.000 claims description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 8
- 239000011734 sodium Substances 0.000 claims description 7
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 6
- 238000009749 continuous casting Methods 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 6
- 229910052708 sodium Inorganic materials 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- BJZIJOLEWHWTJO-UHFFFAOYSA-H dipotassium;hexafluorozirconium(2-) Chemical group [F-].[F-].[F-].[F-].[F-].[F-].[K+].[K+].[Zr+4] BJZIJOLEWHWTJO-UHFFFAOYSA-H 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
- 230000006911 nucleation Effects 0.000 abstract description 5
- 238000010899 nucleation Methods 0.000 abstract description 5
- 238000005266 casting Methods 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 13
- 229910052796 boron Inorganic materials 0.000 description 8
- 239000013078 crystal Substances 0.000 description 6
- 229910003023 Mg-Al Inorganic materials 0.000 description 5
- 229910016384 Al4C3 Inorganic materials 0.000 description 4
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 4
- 229910007948 ZrB2 Inorganic materials 0.000 description 4
- VWZIXVXBCBBRGP-UHFFFAOYSA-N boron;zirconium Chemical compound B#[Zr]#B VWZIXVXBCBBRGP-UHFFFAOYSA-N 0.000 description 4
- 229910052700 potassium Inorganic materials 0.000 description 4
- 239000011591 potassium Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000011081 inoculation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910007873 ZrAl3 Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- VHHHONWQHHHLTI-UHFFFAOYSA-N hexachloroethane Chemical compound ClC(Cl)(Cl)C(Cl)(Cl)Cl VHHHONWQHHHLTI-UHFFFAOYSA-N 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010137 moulding (plastic) Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/116—Refining the metal
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
-
- 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
-
- 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
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
-
- 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
Definitions
- the present invention relates to an intermediate alloy that improves the properties of metal and alloy, in particular, to a grain refiner of magnesium and magnesium alloy and its preparation method thereof.
- Magnesium and magnesium alloys are the lightest metal structural materials available now, which have such advantages as low density, high specific strength and specific stiffness, good damping resistance, good thermal conductivity, excellent electromagnetic shielding effect, excellent machining performance, stable part size and easy to recycle, etc..
- Magnesium and magnesium alloys, especially wrought magnesium alloy have enormous application potential in transportation tools, engineering structure materials and electronics industries, etc.. Wrought magnesium alloys refer to those magnesium alloys that can be processed by plastic molding methods such as extrusion, rolling, forging, etc.. However, restricted by some factors such as preparation of materials, processing technology, corrosion resistance performance and price, the applications of magnesium alloy especially wrought magnesium alloy are far less than steel and aluminum alloys. There is a great gap between the development potential and actual applications of magnesium and magnesium alloy in the field of metal materials.
- Zr is the element that has obvious refining effect of pure magnesium grains. Studies have shown that Zr can effectively inhibit the growth of magnesium alloy grains to refine the grains. Zr can be used in pure Mg, Mg-Zn and Mg-RE; but Zr has very low solubility in liquid magnesium, and when peritectic reaction occurs, only 0.6wt% Zr can be dissolved in liquid magnesium; moreover, Zr and Al, Mn will form a stable compound to precipitate, which cannot achieve the effect of grains refinement. Therefore, Zr cannot be added to Mg-Al-based and Mg-Mn-based alloys. Currently, Mg-Al-based alloy is the most popular commercial magnesium alloy.
- the Mg-Al-based alloy has a large as-cast grain, and sometime even shows large columnar crystals and fan-like crystals, which makes deformation of ingots, difficult in processing, easy to crack, low yield, poor mechanical properties, and very low plastic deformation rate, which seriously affects the industrial production. Therefore, in order to achieve large-scale production, it is necessary to resolve the problem of as-cast grain refinement of magnesium alloys.
- the grain refinement method of Mg-Al alloys mainly includes overheating method, rare earth element method and carbon inoculation method, etc.. Overheating method has some effect, but the melt oxidation is more serious, while the rare earth element method is neither stable nor ideal.
- the carbon inoculation method due to its extensive sources of raw materials, low operating temperature, has become the most important grain refinement method of Mg-Al-based alloys.
- the traditional carbon inoculation method is to add MgCO 3 or C 2 Cl 6 , etc.. Its principle is to form a large number of dispersed Al 4 C 3 particles.
- Al 4 C 3 is a better heterogeneous nucleation of magnesium alloy, thus, a large number of dispersed Al 4 C 3 nuclei can make refinement of magnesium alloy grains.
- melt is easy to boil, so it is rarely used in the production.
- no common intermediate alloy of grain refinement is available in the magnesium alloy industry now, and the application range of various grain refinement methods also depends on the alloy-based or alloy compositions.
- the present invention provides an intermediate alloy used for grain refinement of magnesium and magnesium alloy.
- This kind of intermediate alloy has very strong nucleation ability for magnesium and magnesium alloy.
- This invention also provides the preparation method of the intermediate alloy.
- ZrB 2 is a kind of crystal nucleus with nucleation ability several times stronger than Al 4 C 3 .
- the Al-Zr-B intermediate alloy prepared has very low melting point, which may form a large number of dispersed ZrB 2 and ZrAl 3 particles after melting in magnesium alloy to become better heterogeneous crystal nuclei of magnesium alloy.
- An alloy for magnesium and magnesium alloy grain refinement is provided, and the grain refiner being an aluminum-zirconium-boron intermediate alloy comprising the following chemical compositions by weight percent: 5-20% of Zr, 0.5-4% of B, and the balance being Al.
- the grain refiner is an aluminum-zirconium-boron intermediate alloy comprising the following chemical compositions by weight percent: 5.0 ⁇ 0.5% of Zr, 0.5 ⁇ 0.25% of B and the balance being Al.
- the grain refiner is an aluminum-zirconium-boron intermediate alloy comprising the following chemical compositions by weight percent: 5.0 ⁇ 0.5% of Zr, 1.0 ⁇ 0.25% of B and the balance being Al.
- the grain refiner is an aluminum-zirconium-boron intermediate alloy comprising the following chemical compositions by weight percent: 10.0 ⁇ 1.0% of Zr, 2.0 ⁇ 0.3% of B and the balance being Al.
- the grain refiner is an aluminum-zirconium-boron intermediate alloy comprising the following chemical compositions by weight percent: 15.0 ⁇ 2.0% of Zr, 3.0 ⁇ 0.5% of B and the balance being Al.
- the grain refiner is an aluminum-zirconium-boron intermediate alloy comprising the following chemical compositions by weight percent: 20.0 ⁇ 3.0% of Zr, 4.0 ⁇ 0.7% of B and the balance being Al.
- the impurities of said aluminum - zirconium - boron intermediate alloy comprise the following chemical compositions by weight percent: Fe ⁇ 0.5%, Si ⁇ 0.3%, Cu ⁇ 0.2%, Cr ⁇ 0.2% and other single impurity element ⁇ 0.2%.
- This invention also provides a preparation method of alloy for magnesium and magnesium alloy grain refinement, comprising the following steps:
- Step A Add aluminum in a reactor, heat it to 700- 850 °C, and add the mixture of fluorozirconate and fluoroborate to the reactor;
- Step B After stirring 4-6 hours, extract the upper layer of molten liquid, to remain the lower layer of aluminum- zirconium-boron alloy;
- Step C After deslagging and heat preservation, the resulting aluminum -zirconium -boron alloy can be directly cast, particularly prepared into wire rod with diameter of 9.5mm in a way of continuous casting and rolling or continuous casting and extrusion.
- the mole fraction ffluorozirconate to fluoroborate is 1:1 or 1:2.
- the fluorozirconate is potassium fluorozirconate
- the fluoroborate is potassium fluoroborate
- the fluorozirconate is sodium fluorozirconate
- the fluoroborate is sodium fluoroborate
- the invention can achieve the following technical effect: an intermediate alloy with strong nucleation capability and excellent capability of magnesium and magnesium alloy grain refinement is invented.
- This kind of grain refiner can be applied to casting and rolling of magnesium and magnesium alloy profiles, with high degree of refinement, to promote the extensive industrial applications of magnesium.
- Al-5%Zr-1%B comprises two phases.
- Al 3 Zr in the photo is gray flocculent or massive phase, dispersed in the metal;
- ZrB 2 is black particulate, with very small size, and most of which are of submicron order.
- Al 3 Zr is still gray flocculent or massive phase
- ZrB2 is black particulate, with increased size in both phases.
- Fig. 3-a is the metallograph of pure magnesium and its grain is a 1-8mm columnar crystal in width, in scattered distribution;
- Fig.3-b and 3-c are the metallographs of pure magnesium added with 2 ⁇ and 5 ⁇ Al-5%Zr-1%B respectively; as shown from these figures, the central parts are all equiaxed grains, surrounded by a small amount of columnar crystals, with the grain size of 300 ⁇ m-2mm when the added amount is 2 ⁇ , and with the grain size of 100 ⁇ m-1mm when the added amount is 5 ⁇ .
- Fig. 4-b and Fig. 4-c are the metallographs of pure magnesium added with 2 ⁇ and 5 ⁇ Al-10%Zr-2%B alloys.
Abstract
Description
- The present invention relates to an intermediate alloy that improves the properties of metal and alloy, in particular, to a grain refiner of magnesium and magnesium alloy and its preparation method thereof.
- Magnesium and magnesium alloys are the lightest metal structural materials available now, which have such advantages as low density, high specific strength and specific stiffness, good damping resistance, good thermal conductivity, excellent electromagnetic shielding effect, excellent machining performance, stable part size and easy to recycle, etc.. Magnesium and magnesium alloys, especially wrought magnesium alloy have enormous application potential in transportation tools, engineering structure materials and electronics industries, etc.. Wrought magnesium alloys refer to those magnesium alloys that can be processed by plastic molding methods such as extrusion, rolling, forging, etc.. However, restricted by some factors such as preparation of materials, processing technology, corrosion resistance performance and price, the applications of magnesium alloy especially wrought magnesium alloy are far less than steel and aluminum alloys. There is a great gap between the development potential and actual applications of magnesium and magnesium alloy in the field of metal materials.
- Zr is the element that has obvious refining effect of pure magnesium grains. Studies have shown that Zr can effectively inhibit the growth of magnesium alloy grains to refine the grains. Zr can be used in pure Mg, Mg-Zn and Mg-RE; but Zr has very low solubility in liquid magnesium, and when peritectic reaction occurs, only 0.6wt% Zr can be dissolved in liquid magnesium; moreover, Zr and Al, Mn will form a stable compound to precipitate, which cannot achieve the effect of grains refinement. Therefore, Zr cannot be added to Mg-Al-based and Mg-Mn-based alloys. Currently, Mg-Al-based alloy is the most popular commercial magnesium alloy. The Mg-Al-based alloy has a large as-cast grain, and sometime even shows large columnar crystals and fan-like crystals, which makes deformation of ingots, difficult in processing, easy to crack, low yield, poor mechanical properties, and very low plastic deformation rate, which seriously affects the industrial production. Therefore, in order to achieve large-scale production, it is necessary to resolve the problem of as-cast grain refinement of magnesium alloys. The grain refinement method of Mg-Al alloys mainly includes overheating method, rare earth element method and carbon inoculation method, etc.. Overheating method has some effect, but the melt oxidation is more serious, while the rare earth element method is neither stable nor ideal. The carbon inoculation method, due to its extensive sources of raw materials, low operating temperature, has become the most important grain refinement method of Mg-Al-based alloys. The traditional carbon inoculation method is to add MgCO3 or C2Cl6, etc.. Its principle is to form a large number of dispersed Al4C3 particles. Al4C3 is a better heterogeneous nucleation of magnesium alloy, thus, a large number of dispersed Al4C3 nuclei can make refinement of magnesium alloy grains. However, when such grain refiner is added, melt is easy to boil, so it is rarely used in the production. In short, as compared with the aluminum alloy industry, no common intermediate alloy of grain refinement is available in the magnesium alloy industry now, and the application range of various grain refinement methods also depends on the alloy-based or alloy compositions.
- Thus, to invent a kind of common grain refiner (alloy) for effective refinement of as-cast grains during solidification of magnesium and magnesium alloys is one of the key factors to realize industrialization of wrought magnesium and its alloys.
- In order to overcome the deficiencies of the prior arts, the present invention provides an intermediate alloy used for grain refinement of magnesium and magnesium alloy. This kind of intermediate alloy has very strong nucleation ability for magnesium and magnesium alloy. This invention also provides the preparation method of the intermediate alloy.
- Numerous experimental studies of magnesium alloy grain refinement have shown that, ZrB2 is a kind of crystal nucleus with nucleation ability several times stronger than Al4C3. The Al-Zr-B intermediate alloy prepared has very low melting point, which may form a large number of dispersed ZrB2 and ZrAl3 particles after melting in magnesium alloy to become better heterogeneous crystal nuclei of magnesium alloy.
- The technical scheme adopted in this invention is as follows:
- An alloy for magnesium and magnesium alloy grain refinement is provided, and the grain refiner being an aluminum-zirconium-boron intermediate alloy comprising the following chemical compositions by weight percent: 5-20% of Zr, 0.5-4% of B, and the balance being Al.
- Preferably, the grain refiner is an aluminum-zirconium-boron intermediate alloy comprising the following chemical compositions by weight percent: 5.0±0.5% of Zr, 0.5±0.25% of B and the balance being Al.
- Preferably, the grain refiner is an aluminum-zirconium-boron intermediate alloy comprising the following chemical compositions by weight percent: 5.0±0.5% of Zr, 1.0±0.25% of B and the balance being Al.
- Preferably, the grain refiner is an aluminum-zirconium-boron intermediate alloy comprising the following chemical compositions by weight percent: 10.0±1.0% of Zr, 2.0±0.3% of B and the balance being Al.
- Preferably, the grain refiner is an aluminum-zirconium-boron intermediate alloy comprising the following chemical compositions by weight percent: 15.0±2.0% of Zr, 3.0±0.5% of B and the balance being Al.
- Preferably, the grain refiner is an aluminum-zirconium-boron intermediate alloy comprising the following chemical compositions by weight percent: 20.0±3.0% of Zr, 4.0±0.7% of B and the balance being Al.
- Preferably, the impurities of said aluminum - zirconium - boron intermediate alloy comprise the following chemical compositions by weight percent: Fe≤0.5%, Si≤0.3%, Cu≤0.2%, Cr≤0.2% and other single impurity element ≤0.2%.
- This invention also provides a preparation method of alloy for magnesium and magnesium alloy grain refinement, comprising the following steps:
- Step A: Add aluminum in a reactor, heat it to 700- 850 °C, and add the mixture of fluorozirconate and fluoroborate to the reactor;
- Step B: After stirring 4-6 hours, extract the upper layer of molten liquid, to remain the lower layer of aluminum- zirconium-boron alloy;
- Step C: After deslagging and heat preservation, the resulting aluminum -zirconium -boron alloy can be directly cast, particularly prepared into wire rod with diameter of 9.5mm in a way of continuous casting and rolling or continuous casting and extrusion.
- Wherein the aluminum is added excessively.
- Preferably, the mole fraction ffluorozirconate to fluoroborate is 1:1 or 1:2.
- Preferably, the fluorozirconate is potassium fluorozirconate , and the fluoroborate is potassium fluoroborate.
-
- Wherein the aluminum is added excessively.
- Preferably, the fluorozirconate is sodium fluorozirconate, and the fluoroborate is sodium fluoroborate.
-
- Wherein the aluminum is added excessively.
- The invention can achieve the following technical effect: an intermediate alloy with strong nucleation capability and excellent capability of magnesium and magnesium alloy grain refinement is invented. This kind of grain refiner can be applied to casting and rolling of magnesium and magnesium alloy profiles, with high degree of refinement, to promote the extensive industrial applications of magnesium.
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Fig. 1 shows the metallograph of aluminum- zirconium-boron alloy under 100 folds in Embodiment 1. -
Fig. 2 shows the metallograph of aluminum- zirconium-boron alloy under 100 folds in Embodiment 3. -
Fig. 3 shows the comparative photo of alloys before and after grain refinement prepared in Embodiment 1. -
Fig. 4 shows the comparative photo of alloys before and after grain refinement prepared in Embodiment 3. - Weigh 100 kg aluminum and put it in a reactor, heat it to 750°C, and add the mixture of 15.8 kg potassium fluozirconate and 11.58kg potassium fluoborate to the reactor. After stirring 4 hours, extract the upper layer of molten liquid, to remain the lower layer of aluminum- zirconium-boron alloy of 94%Al-5%Zr-1%B. After deslaggingand heat preservation, the resulting aluminum -zirconium -boron alloy can be directly rolled into wire rods with diameter of 9.5mm in a way of continuous casting and rolling.
- Weigh 100 kg aluminum and put it in a reactor, heat it to 700°C, and add the mixture of 14kg sodium fluozirconate and 10.1kg sodium fluoborate to the reactor. After stirring 6 hours, extract the upper layer of molten liquid, to remain the lower layer of aluminum- zirconium-boron alloy of 94%Al-5%Zr-1%B. After deslagging and heat preservation, the resulting aluminum -zirconium -boron alloy can be directly used by casting molding.
- Weigh 100 kg aluminum and put it in a reactor, heat it to 800°C, and add the mixture of 32.23kg potassium fluozirconate and 23.74kg potassium fluoborate to the reactor. After stirring 6 hours, extract the upper layer of molten liquid, to remain the lower layer of aluminum- zirconium-boron alloy of 88%Al-10%Zr-2%B. After deslagging and heat preservation, the resulting aluminum -zirconium -boron alloy can be directly rolled into wire rods with diameter of 9.5mm in a way of continuous casting and rolling.
- Weigh 100 kg aluminum and put it in a reactor, heat it to 850°C, and add the mixture of 28.59kg sodium fluozirconate and 20.73kg sodium fluoborate to the reactor. After stirring 5 hours, extract the upper layer of molten liquid, to remain the lower layer of aluminum- zirconium-boron alloy of 88%Al-10%Zr-2%B. After deslagging and heat preservation, the resulting aluminum -zirconium -boron alloy can be directly used by casting molding.
- As shown from
Fig.1 , Al-5%Zr-1%B comprises two phases. Al3Zr in the photo is gray flocculent or massive phase, dispersed in the metal; ZrB2 is black particulate, with very small size, and most of which are of submicron order. - As shown from
Fig.2 , compared with Al-5%Zr-1%B, in the Al-10%Zr-2%B, Al3Zr is still gray flocculent or massive phase, and ZrB2 is black particulate, with increased size in both phases. -
Fig. 3-a is the metallograph of pure magnesium and its grain is a 1-8mm columnar crystal in width, in scattered distribution;Fig.3-b and 3-c are the metallographs of pure magnesium added with 2‰ and 5‰ Al-5%Zr-1%B respectively; as shown from these figures, the central parts are all equiaxed grains, surrounded by a small amount of columnar crystals, with the grain size of 300µm-2mm when the added amount is 2‰, and with the grain size of 100µm-1mm when the added amount is 5‰.Fig. 4-b and Fig. 4-c are the metallographs of pure magnesium added with 2‰ and 5‰Al-10%Zr-2%B alloys. As shown from the figures, all grains are refined into equiaxed grains, with the grain size of 200µm-1.5mm when the added amount is 2‰, and with the grain size of 100µm-1mm when the added amount is 5‰. The test results show that Al-Zr-B intermediate alloy in the present invention has good effect of grain refinement for magnesium alloys. - The foregoing invention has been described in detail by way of illustration and example for purposes of clarity and understanding. As is readily apparent to one skilled in the art, the foregoing are only some of the methods and compositions that illustrate the embodiments of the foregoing invention. It will be apparent to those of ordinary skill in the art that variations, changes, modifications and alterations may be applied to the compositions and/or methods described herein without departing from the true spirit, concept and scope of the invention.
Claims (10)
- An alloy for magnesium and magnesium alloy grain refinement, wherein the grain refiner is an aluminum-zirconium-boron intermediate alloy comprising the following chemical compositions by weight percent: 5-20% of Zr, 0.5-4% of B, and the balance being Al.
- The alloy for magnesium and magnesium alloy grain refinement according to claim 1, wherein the grain refiner is an aluminum-zirconium-boron intermediate alloy comprising the following chemical compositions by weight percent: 5.0±0.5% of Zr, 0.5±0.25% of B and the balance being Al.
- The alloy for magnesium and magnesium alloy grain refinement according to claim 1, wherein the grain refiner is an aluminum-zirconium-boron intermediate alloy comprising the following chemical compositions by weight percent: 5.0±0.5% of Zr, 1.0±0.25% of B and the balance being Al.
- The alloy for magnesium and magnesium alloy grain refinement according to claim 1, wherein the grain refiner is an aluminum-zirconium-boron intermediate alloy comprising the following chemical compositions by weight percent: 10.0±1.0% of Zr, 2.0±0.3% of B and the balance being Al.
- The alloy for magnesium and magnesium alloy grain refinement according to claim 1, wherein the grain refiner is an aluminum-zirconium-boron intermediate alloy comprising the following chemical compositions by weight percent: 15.0±2.0% of Zr, 3.0±0.5% of B and the balance being Al.
- The alloy for magnesium and magnesium alloy grain refinement according to claim 1, wherein the grain refiner is an aluminum-zirconium-boron intermediate alloy comprising the following chemical compositions by weight percent: 20.0±3.0% of Zr, 4.0±0.7% of B and the balance being Al.
- The alloy for magnesium and magnesium alloy grain refinement according to claim 1, wherein the impurities of said aluminum - zirconium - boron intermediate alloy comprise the following chemical compositions by weight percent: Fe≤0.5%, Si≤0.3%, Cu≤0.2%, Cr≤0.2% and other single impurity element ≤0.2%.
- A preparation method of alloy for magnesium and magnesium alloy grain refinement according to claims 1-7, comprising the following steps:Step A: Add aluminum in a reactor, heat it to 700- 850 °C, and add the mixture of fluorozirconate and fluoroborate to the reactor;Step B: After stirring 4-6 hours, extract the upper layer of molten liquid, to remain the lower layer of aluminum- zirconium-boron alloy;Step C: After deslagging and heat preservation, the resulting aluminum -zirconium -boron alloy can be directly cast, particularly prepared into wire rod with diameter of 9.5mm in a way of continuous casting and rolling or continuous casting and extrusion. Wherein the aluminum is added excessively.
- The preparation method according to claim 8, wherein the mole fraction ffluorozirconate to fluoroborate is 1:2 to 1:1.
- The preparation method according to claim 8 or claim 9, wherein the fluorozirconate is potassium fluorozirconate or sodium fluorozirconate, and the fluoroborate is potassium fluoroborate or sodium fluoroborate.
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CN201210289740.2A CN102776421B (en) | 2012-08-15 | 2012-08-15 | Alloy for refinement of magnesium and alloy grain thereof and preparation method of alloy |
PCT/CN2012/084981 WO2014026446A1 (en) | 2012-08-15 | 2012-11-21 | Alloy for magnesium and magnesium alloy grain refinement, and preparation method thereof |
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US (1) | US20150211096A1 (en) |
EP (1) | EP2886670A4 (en) |
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WO (1) | WO2014026446A1 (en) |
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CN106048273A (en) * | 2016-07-04 | 2016-10-26 | 东南大学 | Aluminum silicon lanthanum boron quaternary intermediate alloy and preparing method thereof |
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CN102776421B (en) * | 2012-08-15 | 2014-03-26 | 深圳市新星轻合金材料股份有限公司 | Alloy for refinement of magnesium and alloy grain thereof and preparation method of alloy |
CN106893912A (en) * | 2017-02-27 | 2017-06-27 | 广东省材料与加工研究所 | A kind of magnesium alloy grain refining agent and preparation method thereof |
CN109554596B (en) * | 2018-12-19 | 2020-11-24 | 靳职雄 | Wrought magnesium alloy with high ductility and preparation method thereof |
CN113151713A (en) * | 2021-04-23 | 2021-07-23 | 东北大学 | Al-Zr-B intermediate alloy and preparation method and application thereof |
CN113523184A (en) * | 2021-06-08 | 2021-10-22 | 上海航天精密机械研究所 | Magnesium alloy sand mold casting method |
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GB1268812A (en) * | 1969-04-23 | 1972-03-29 | Anglo Metallurg Ltd | Improvements in or relating to alloys containing boron and aluminium |
WO2009129559A1 (en) * | 2008-04-22 | 2009-10-29 | Joka Buha | Magnesium grain refining using vanadium |
CN101457312A (en) * | 2009-01-04 | 2009-06-17 | 武汉理工大学 | Method for preparing Mg-Ti-B grain refiner for magnesium and magnesium alloy |
CN102212724A (en) * | 2011-05-20 | 2011-10-12 | 江苏大学 | Al-Zr-B intermediate alloy as well as preparation method and application thereof |
CN102776421B (en) * | 2012-08-15 | 2014-03-26 | 深圳市新星轻合金材料股份有限公司 | Alloy for refinement of magnesium and alloy grain thereof and preparation method of alloy |
-
2012
- 2012-08-15 CN CN201210289740.2A patent/CN102776421B/en active Active
- 2012-11-21 US US14/420,538 patent/US20150211096A1/en not_active Abandoned
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CN106048273A (en) * | 2016-07-04 | 2016-10-26 | 东南大学 | Aluminum silicon lanthanum boron quaternary intermediate alloy and preparing method thereof |
CN106048273B (en) * | 2016-07-04 | 2018-09-21 | 东南大学 | A kind of aluminium silicon lanthanum boron quaternary intermediate alloy and preparation method thereof |
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CN102776421A (en) | 2012-11-14 |
CN102776421B (en) | 2014-03-26 |
US20150211096A1 (en) | 2015-07-30 |
EP2886670A4 (en) | 2015-11-18 |
WO2014026446A1 (en) | 2014-02-20 |
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