CN112725673A - Mg-Al alloy and preparation method thereof - Google Patents
Mg-Al alloy and preparation method thereof Download PDFInfo
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- CN112725673A CN112725673A CN202011572422.8A CN202011572422A CN112725673A CN 112725673 A CN112725673 A CN 112725673A CN 202011572422 A CN202011572422 A CN 202011572422A CN 112725673 A CN112725673 A CN 112725673A
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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
- 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
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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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
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Abstract
The Mg-Al alloy comprises the following components in percentage by mass: 6-6.5%, Ca: 0.5% -3.0%, Sm: 1.0% -4.0%, Sr: 0.5 to 1.2 percent of magnesium, and the balance of Mg and impurity elements. According to the invention, through the composite use of Mg-30 Sm and Mg-30 Ca, based on the fine grain strengthening and solid solution strengthening mechanisms, the mechanical property of the magnesium alloy can be further improved by applying the composite action of one or more strengthening modes, the thermal sensitivity is reduced, and meanwhile, the Mg-30 Ca can purify the melt, so that the casting quality is improved. The preparation method disclosed by the invention is reliable in principle, simple to operate and wide in market application prospect.
Description
Technical Field
The invention relates to the technical field of Mg-Al alloy, in particular to Mg-Al alloy and a preparation method thereof.
Background
The magnesium alloy has the advantages of small density, high strength, good corrosion resistance, complete recovery, no pollution and the like, is the lightest metal structure material applied to the industry at present and a functional material with special purpose, and is widely applied to the fields of automobile industry, aerospace, weaponry, metallurgical chemical industry and the like.
Compared with aluminum alloy, the Mg-Al alloy has poor fluidity, complex casting process and large temperature span of a solid-liquid two-phase region in a solidification process, so that hot cracks are easy to appear before the hot joint of an alloy casting is completely solidified, the hot cracking sensitivity of the alloy is high, and the development of the Mg-Al alloy in the engineering application process is limited.
An article, "Processing microstrueture and Ageing bhavior of In-situ Submicron TiB2 particle Reinforcement AZ91 Mg Matrix Composites", is published In 764, 5.2018, Journal of Alloys and Composites, and it was found that adding Submicron TiB2 prepared by ball milling to AZ91 alloy results In significantly smaller grain size and improved mechanical properties, and the strength of the composite material is further improved after T6 heat treatment. However, the alloy needs to adopt a semi-solid technology in the preparation process, and meanwhile, the TiB2 particles need to be mechanically stirred in order to be uniformly distributed, so that the process is complex, the cost is high, and the method is only suitable for manufacturing small-batch key parts.
Disclosure of Invention
In view of the above, the present invention is directed to an Mg-Al alloy and a method for preparing the same, to which Mg-30 Sm and Mg-30 Ca are simultaneously added to reduce the hot cracking sensitivity of the alloy. In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the Mg-Al alloy comprises the following components in percentage by mass: 6-6.5%, Ca: 0.5% -3.0%, Sm: 1.0% -4.0%, Sr: 0.5 to 1.2 percent of magnesium, and the balance of Mg and impurity elements.
In some embodiments, the mass percent of Al is 6.1%, the mass percent of Ca is 3.0%, the mass percent of Sm is 4.0%, and the mass percent of Sr is 1.2%.
In some embodiments, the mass percent of Al is 6.5%, the mass percent of Ca is 2.5%, the mass percent of Sm is 2.2%, and the mass percent of Sr is 0.8%.
In some embodiments, the mass percent of Al is 6.2%, the mass percent of Ca is 2.6%, the mass percent of Sm is 3.5%, and the mass percent of Sr is 1.2%.
The preparation method of the Mg-Al alloy comprises the following steps,
(1) preparing materials: weighing Al: 6-6.5%, Ca: 0.5% -3.0%, Sm: 1.0% -4.0%, Sr: 0.5% -1.2%, and the balance of Mg and impurity elements;
(2) taking a low-carbon steel crucible, heating to 230-250 ℃, putting the steel crucible back into a heating furnace after coating ZnO paint on the surface, adjusting the temperature to 500 ℃, and preserving the temperature for 20 min;
(3) brushing ZnO coating on a mould, a stirring rod, a slag removing spoon and a bell jar, then putting the mould, the stirring rod, the slag removing spoon and the bell jar into an oven for preheating at 250 ℃, and simultaneously preheating weighed pure magnesium, pure aluminum, Mg-30 Ca, Mg-30 Sm and Al-10Sr at 250 ℃ to remove moisture;
(4) putting pure magnesium preheated to 250 ℃ into a crucible, scattering a covering agent on the surface of a magnesium block, introducing CO2 and SF6 protective gas after the magnesium block is heated, heating to 720 ℃, preserving the temperature for 20 to 30 minutes, and waiting for the magnesium block to be melted into a liquid state;
(5) after the magnesium blocks are melted, rapidly slagging off, then sequentially adding preheated pure aluminum, Mg-30 Ca intermediate alloy, Mg-30 Sm intermediate alloy and Al-10Sr intermediate alloy into the magnesium alloy solution, fully stirring, uniformly scattering a covering agent on the surface of the solution after stirring, and preserving heat for 30 minutes at 720-730 ℃;
(6) after heat preservation, the temperature of the furnace is raised to 730 ℃, a refining agent is added for refining, after stirring for about 10 minutes, the solution is kept stand for 15 to 20 minutes, scum on the surface is removed, and the solution is cast into a mold preheated to 250 ℃ under the condition of 720 to 730 ℃ to prepare an ingot;
(7) the magnesium alloy thus obtained was subjected to solution treatment at 400 ℃ for 8 hours.
In some embodiments, the coating agent used in step (4) and step (5) comprises 50% KCl +50% NaCl by weight percentage.
In some embodiments, the flow rate of CO2 and SF6 shielding gas in step (4) is 1.6L/min.
In some embodiments, the refining agent in step (6) is hexachloroethane.
Compared with the prior art, the Mg-Al alloy has the following advantages:
according to the invention, through the composite use of Mg-30 Sm and Mg-30 Ca, based on the fine grain strengthening and solid solution strengthening mechanisms, the mechanical property of the magnesium alloy can be further improved by applying the composite action of one or more strengthening modes, the thermal sensitivity is reduced, and meanwhile, the Mg-30 Ca can purify the melt, so that the casting quality is improved. The preparation method disclosed by the invention is reliable in principle, simple to operate and wide in market application prospect.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The Mg-Al alloy comprises the following components in percentage by mass: 6-6.5%, Ca: 0.5% -3.0%, Sm: 1.0% -4.0%, Sr: 0.5 to 1.2 percent of magnesium, and the balance of Mg and impurity elements.
In example 1, the mass percentage of Al was 6.1%, the mass percentage of Ca was 3.0%, the mass percentage of Sm was 4.0%, the mass percentage of Sr was 1.2%, and the balance was Mg and impurity elements.
In example 2, the mass percent of Al was 6.5%, the mass percent of Ca was 2.5%, the mass percent of Sm was 2.2%, the mass percent of Sr was 0.8%, and the balance was Mg and impurity elements.
In example 3, the mass percentage of Al was 6.2%, the mass percentage of Ca was 2.6%, the mass percentage of Sm was 3.5%, the mass percentage of Sr was 1.2%, and the balance was Mg and impurity elements.
And in the comparative example, the magnesium-aluminum alloy comprises the following components in percentage by mass: 6.1%, Sr: 1.2% and the balance of Mg and inevitable impurity elements.
The properties of the magnalium alloys in the three examples and one comparative example were compared after testing as follows:
the preparation method of the Mg-Al alloy comprises the following steps,
(1) preparing materials: weighing Al: 6-6.5%, Ca: 0.5% -3.0%, Sm: 1.0% -4.0%, Sr: 0.5 to 1.2 percent of magnesium, and the balance of Mg and impurity elements;
(2) taking a low-carbon steel crucible, heating to 230-250 ℃, after coating ZnO paint on the surface, putting the steel crucible back into a heating furnace, adjusting the temperature to 500 ℃, and preserving the heat for 20 min;
(3) brushing ZnO coating on a mould, a stirring rod, a slag removing spoon and a bell jar, then putting the mould, the stirring rod, the slag removing spoon and the bell jar into an oven for preheating at 250 ℃, and simultaneously preheating weighed pure magnesium, pure aluminum, Mg-30 Ca, Mg-30 Sm and Al-10Sr at 250 ℃ to remove moisture;
(4) putting pure magnesium preheated to 250 ℃ into a crucible, scattering a covering agent on the surface of a magnesium block, introducing CO2 and SF6 protective gas after the magnesium block is heated, heating to 720 ℃, preserving the temperature for 20 to 30 minutes, and waiting for the magnesium block to be melted into a liquid state;
(5) after the magnesium blocks are melted, rapidly slagging off, then sequentially adding preheated pure aluminum, Mg-30 Ca intermediate alloy, Mg-30 Sm intermediate alloy and Al-10Sr intermediate alloy into the magnesium alloy solution, fully stirring, uniformly scattering a covering agent on the surface of the solution after stirring, and preserving heat for 30 minutes at 720-730 ℃;
(6) after heat preservation, the temperature of the furnace is raised to 730 ℃, a refining agent is added for refining, after stirring for about 10 minutes, the solution is kept stand for 15 to 20 minutes, scum on the surface is removed, and the solution is cast into a mold preheated to 250 ℃ under the condition of 720 to 730 ℃ to prepare an ingot;
(7) the magnesium alloy thus obtained was subjected to solution treatment at 400 ℃ for 8 hours.
In some embodiments, step (4) and step (5) use a coverlay having each formulation of 50% KCl +50% NaCl by weight percent.
In some embodiments, the flow rate of CO2 and SF6 shielding gas in step (4) is 1.6L/min.
In some embodiments, the refining agent in step (6) is hexachloroethane.
Compared with the prior art, the Mg-Al alloy has the following advantages:
according to the invention, through the composite use of Mg-30 Sm and Mg-30 Ca, based on the fine grain strengthening and solid solution strengthening mechanisms, the mechanical property of the magnesium alloy can be further improved by applying the composite action of one or more strengthening modes, the thermal sensitivity is reduced, and meanwhile, the Mg-30 Ca can purify the melt, so that the casting quality is improved. The preparation method disclosed by the invention is reliable in principle, simple to operate and wide in market application prospect.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The Mg-Al alloy is characterized by comprising the following components in percentage by mass: 6-6.5%, Ca: 0.5% -3.0%, Sm: 1.0% -4.0%, Sr: 0.5 to 1.2 percent of magnesium, and the balance of Mg and impurity elements.
2. The Mg-Al alloy according to claim 1, wherein the mass% of Al is 6.1%, the mass% of Ca is 3.0%, the mass% of Sm is 4.0%, and the mass% of Sr is 1.2%.
3. The Mg-Al alloy according to claim 1, wherein the mass% of Al is 6.5%, the mass% of Ca is 2.5%, the mass% of Sm is 2.2%, and the mass% of Sr is 0.8%.
4. The Mg-Al alloy according to claim 3, wherein the mass% of Al is 6.2%, the mass% of Ca is 2.6%, the mass% of Sm is 3.5%, and the mass% of Sr is 1.2%.
5. The method of producing a Mg-Al alloy according to claim 1,
(1) preparing materials: weighing Al: 6-6.5%, Ca: 0.5% -3.0%, Sm: 1.0% -4.0%, Sr: 0.5 to 1.2 percent of magnesium, and the balance of Mg and impurity elements;
(2) taking a low-carbon steel crucible, heating to 230-250 ℃, after coating ZnO paint on the surface, putting the steel crucible back into a heating furnace, adjusting the temperature to 500 ℃, and preserving the heat for 20 min;
(3) brushing ZnO coating on a mould, a stirring rod, a slag removing spoon and a bell jar, then putting the mould, the stirring rod, the slag removing spoon and the bell jar into an oven for preheating at 250 ℃, and simultaneously preheating weighed pure magnesium, pure aluminum, Mg-30 Ca, Mg-30 Sm and Al-10Sr at 250 ℃ to remove moisture;
(4) putting pure magnesium preheated to 250 ℃ into a crucible, scattering a covering agent on the surface of a magnesium block, introducing CO2 and SF6 protective gas after the magnesium block is heated, heating to 720 ℃, preserving the temperature for 20 to 30 minutes, and waiting for the magnesium block to be melted into a liquid state;
(5) after the magnesium blocks are melted, rapidly slagging off, then sequentially adding preheated pure aluminum, Mg-30 Ca intermediate alloy, Mg-30 Sm intermediate alloy and Al-10Sr intermediate alloy into the magnesium alloy solution, fully stirring, uniformly scattering a covering agent on the surface of the solution after stirring, and preserving heat for 30 minutes at 720-730 ℃;
(6) after heat preservation, the temperature of the furnace is raised to 730 ℃, a refining agent is added for refining, after stirring for about 10 minutes, the solution is kept stand for 15 to 20 minutes, scum on the surface is removed, and the solution is cast into a mold preheated to 250 ℃ under the condition of 720 to 730 ℃ to prepare an ingot;
(7) the magnesium alloy thus obtained was subjected to solution treatment at 400 ℃ for 8 hours.
6. The method for preparing Mg-Al alloy according to claim 5, wherein said covering agent used in step (4) and step (5) has a formulation of 50% KCl +50% NaCl by weight.
7. The method of claim 5, wherein the flow rate of the CO2 and SF6 shielding gas introduced in step (4) is 1.6L/min.
8. A method of producing a Mg-Al alloy according to claim 5, wherein the refining agent in step (6) is hexachloroethane.
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| CN202011572422.8A CN112725673A (en) | 2020-12-28 | 2020-12-28 | Mg-Al alloy and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114540687A (en) * | 2021-12-16 | 2022-05-27 | 中信戴卡股份有限公司 | Magnesium alloy, preparation method thereof and process for preparing wheel by using magnesium alloy |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0461633A1 (en) * | 1990-06-13 | 1991-12-18 | Tsuyoshi Masumoto | High strength magnesium-based alloys |
| CN1174243A (en) * | 1996-04-04 | 1998-02-25 | 玛志达株式会社 | Heat-resisting magensium alloy forming member, heat-resisting magnesium alloy for forming and forming method thereof |
| CN104674092A (en) * | 2015-02-27 | 2015-06-03 | 河南科技大学 | Mg-Al-Zn heat-resistant magnesium alloy containing Sm and preparation method of alloy |
| CN111172441A (en) * | 2020-01-21 | 2020-05-19 | 中信戴卡股份有限公司 | Cast magnesium alloy and preparation method thereof |
-
2020
- 2020-12-28 CN CN202011572422.8A patent/CN112725673A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0461633A1 (en) * | 1990-06-13 | 1991-12-18 | Tsuyoshi Masumoto | High strength magnesium-based alloys |
| CN1174243A (en) * | 1996-04-04 | 1998-02-25 | 玛志达株式会社 | Heat-resisting magensium alloy forming member, heat-resisting magnesium alloy for forming and forming method thereof |
| CN104674092A (en) * | 2015-02-27 | 2015-06-03 | 河南科技大学 | Mg-Al-Zn heat-resistant magnesium alloy containing Sm and preparation method of alloy |
| CN111172441A (en) * | 2020-01-21 | 2020-05-19 | 中信戴卡股份有限公司 | Cast magnesium alloy and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114540687A (en) * | 2021-12-16 | 2022-05-27 | 中信戴卡股份有限公司 | Magnesium alloy, preparation method thereof and process for preparing wheel by using magnesium alloy |
| CN114540687B (en) * | 2021-12-16 | 2022-11-25 | 中信戴卡股份有限公司 | Magnesium alloy, preparation method thereof and process for preparing wheel by using magnesium alloy |
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